diff --git a/src/client/inc/tscUtil.h b/src/client/inc/tscUtil.h
index 0b6ae064166bf4eefa8145c6b38cb3efa59e48c9..6e8559538d93f3356ca8d0fff9a936680c0fc564 100644
--- a/src/client/inc/tscUtil.h
+++ b/src/client/inc/tscUtil.h
@@ -24,6 +24,7 @@ extern "C" {
  * @date   2018/09/30
  */
 #include "os.h"
+#include "tbuffer.h"
 #include "qextbuffer.h"
 #include "taosdef.h"
 #include "tscSecondaryMerge.h"
@@ -176,8 +177,8 @@ void tscIncStreamExecutionCount(void* pStream);
 bool tscValidateColumnId(STableMetaInfo* pTableMetaInfo, int32_t colId);
 
 // get starter position of metric query condition (query on tags) in SSqlCmd.payload
-SCond* tsGetSTableQueryCondPos(STagCond* pCond, uint64_t tableIndex);
-void   tsSetSTableQueryCond(STagCond* pTagCond, uint64_t uid, const char* str);
+SCond* tsGetSTableQueryCond(STagCond* pCond, uint64_t uid);
+void   tsSetSTableQueryCond(STagCond* pTagCond, uint64_t uid, SBuffer* pBuf);
 
 void tscTagCondCopy(STagCond* dest, const STagCond* src);
 void tscTagCondRelease(STagCond* pCond);
@@ -199,7 +200,7 @@ int32_t tscGetQueryInfoDetailSafely(SSqlCmd *pCmd, int32_t subClauseIndex, SQuer
 STableMetaInfo* tscGetMeterMetaInfoByUid(SQueryInfo* pQueryInfo, uint64_t uid, int32_t* index);
 void            tscClearMeterMetaInfo(STableMetaInfo* pTableMetaInfo, bool removeFromCache);
 
-STableMetaInfo* tscAddMeterMetaInfo(SQueryInfo* pQueryInfo, const char* name, STableMeta* pTableMeta, SSuperTableMeta* pMetricMeta,
+STableMetaInfo* tscAddTableMetaInfo(SQueryInfo* pQueryInfo, const char* name, STableMeta* pTableMeta, SArray* vgroupList,
                                     int16_t numOfTags, int16_t* tags);
 STableMetaInfo* tscAddEmptyMetaInfo(SQueryInfo *pQueryInfo);
 int32_t tscAddSubqueryInfo(SSqlCmd *pCmd);
diff --git a/src/client/inc/tsclient.h b/src/client/inc/tsclient.h
index 80c3e77eff55585bb240a4f6a817b6fda0387ca1..5c442a155b22faf6f57a286ae3738764ed9a33a2 100644
--- a/src/client/inc/tsclient.h
+++ b/src/client/inc/tsclient.h
@@ -43,7 +43,7 @@ struct SSqlInfo;
 typedef struct SSqlGroupbyExpr {
   int16_t     tableIndex;
   int16_t     numOfGroupCols;
-  SColIndexEx columnInfo[TSDB_MAX_TAGS];  // group by columns information
+  SColIndex   columnInfo[TSDB_MAX_TAGS];  // group by columns information
   int16_t     orderIndex;                 // order by column index
   int16_t     orderType;                  // order by type: asc/desc
 } SSqlGroupbyExpr;
@@ -86,7 +86,7 @@ typedef struct STableMetaInfo {
 /* the structure for sql function in select clause */
 typedef struct SSqlExpr {
   char        aliasName[TSDB_COL_NAME_LEN];  // as aliasName
-  SColIndexEx colInfo;
+  SColIndex   colInfo;
   int64_t     uid;            // refactor use the pointer
   int16_t     functionId;     // function id in aAgg array
   int16_t     resType;        // return value type
@@ -141,6 +141,7 @@ struct SLocalReducer;
 
 typedef struct SCond {
   uint64_t uid;
+  int32_t  len;   // length of tag query condition data
   char *   cond;
 } SCond;
 
@@ -167,8 +168,7 @@ typedef struct STagCond {
   SJoinInfo joinInfo;
 
   // for different table, the query condition must be seperated
-  SCond   cond[TSDB_MAX_JOIN_TABLE_NUM];
-  int16_t numOfTagCond;
+  SArray*  pCond;
 } STagCond;
 
 typedef struct SParamInfo {
diff --git a/src/client/src/tscAsync.c b/src/client/src/tscAsync.c
index 62888234019cf2fe9e77fe476b731e6918499d7a..e6722253080b56c943eb67bea5c0212ada5bda84 100644
--- a/src/client/src/tscAsync.c
+++ b/src/client/src/tscAsync.c
@@ -464,13 +464,15 @@ void tscTableMetaCallBack(void *param, TAOS_RES *res, int code) {
       if (code == TSDB_CODE_ACTION_IN_PROGRESS) return;
     } else {  // normal async query continues
       if (pCmd->isParseFinish) {
-        tscTrace("%p resend data to vnode in metermeta callback since sql has been parsed completed", pSql);
+        tscTrace("%p re-send data to vnode in table Meta callback since sql parsed completed", pSql);
         
         STableMetaInfo* pTableMetaInfo = tscGetTableMetaInfoFromCmd(pCmd, pCmd->clauseIndex, 0);
         code = tscGetTableMeta(pSql, pTableMetaInfo);
         assert(code == TSDB_CODE_SUCCESS);
       
         if (pTableMetaInfo->pTableMeta) {
+          // todo update the submit message according to the new table meta
+          // 1. table uid, 2. ip address
           code = tscSendMsgToServer(pSql);
           if (code == TSDB_CODE_SUCCESS) return;
         }
diff --git a/src/client/src/tscFunctionImpl.c b/src/client/src/tscFunctionImpl.c
index c7be1b84cefa4271f8dae73c9dd3235b6597f0e0..0fa9e01c2ed570f8305f616cea3d5ae5332940b5 100644
--- a/src/client/src/tscFunctionImpl.c
+++ b/src/client/src/tscFunctionImpl.c
@@ -691,7 +691,7 @@ static int32_t data_req_load_info(SQLFunctionCtx *pCtx, TSKEY start, TSKEY end,
 
 // todo: if  column in current data block are null, opt for this case
 static int32_t first_data_req_info(SQLFunctionCtx *pCtx, TSKEY start, TSKEY end, int32_t colId) {
-  if (pCtx->order == TSQL_SO_DESC) {
+  if (pCtx->order == TSDB_ORDER_DESC) {
     return BLK_DATA_NO_NEEDED;
   }
   
@@ -704,7 +704,7 @@ static int32_t first_data_req_info(SQLFunctionCtx *pCtx, TSKEY start, TSKEY end,
 }
 
 static int32_t last_data_req_info(SQLFunctionCtx *pCtx, TSKEY start, TSKEY end, int32_t colId) {
-  if (pCtx->order == TSQL_SO_ASC) {
+  if (pCtx->order == TSDB_ORDER_ASC) {
     return BLK_DATA_NO_NEEDED;
   }
   
@@ -716,7 +716,7 @@ static int32_t last_data_req_info(SQLFunctionCtx *pCtx, TSKEY start, TSKEY end,
 }
 
 static int32_t first_dist_data_req_info(SQLFunctionCtx *pCtx, TSKEY start, TSKEY end, int32_t colId) {
-  if (pCtx->order == TSQL_SO_DESC) {
+  if (pCtx->order == TSDB_ORDER_DESC) {
     return BLK_DATA_NO_NEEDED;
   }
   
@@ -732,7 +732,7 @@ static int32_t first_dist_data_req_info(SQLFunctionCtx *pCtx, TSKEY start, TSKEY
 }
 
 static int32_t last_dist_data_req_info(SQLFunctionCtx *pCtx, TSKEY start, TSKEY end, int32_t colId) {
-  if (pCtx->order == TSQL_SO_ASC) {
+  if (pCtx->order == TSDB_ORDER_ASC) {
     return BLK_DATA_NO_NEEDED;
   }
   
@@ -1483,7 +1483,7 @@ static bool first_last_function_setup(SQLFunctionCtx *pCtx) {
 
 // todo opt for null block
 static void first_function(SQLFunctionCtx *pCtx) {
-  if (pCtx->order == TSQL_SO_DESC) {
+  if (pCtx->order == TSDB_ORDER_DESC) {
     return;
   }
   
@@ -1513,7 +1513,7 @@ static void first_function(SQLFunctionCtx *pCtx) {
 }
 
 static void first_function_f(SQLFunctionCtx *pCtx, int32_t index) {
-  if (pCtx->order == TSQL_SO_DESC) {
+  if (pCtx->order == TSDB_ORDER_DESC) {
     return;
   }
   
@@ -1561,7 +1561,7 @@ static void first_dist_function(SQLFunctionCtx *pCtx) {
    * 1. data block that are not loaded
    * 2. scan data files in desc order
    */
-  if (pCtx->order == TSQL_SO_DESC) {
+  if (pCtx->order == TSDB_ORDER_DESC) {
     return;
   }
   
@@ -1596,7 +1596,7 @@ static void first_dist_function_f(SQLFunctionCtx *pCtx, int32_t index) {
     return;
   }
   
-  if (pCtx->order == TSQL_SO_DESC) {
+  if (pCtx->order == TSDB_ORDER_DESC) {
     return;
   }
   
@@ -1654,7 +1654,7 @@ static void first_dist_func_second_merge(SQLFunctionCtx *pCtx) {
  *    least one data in this block that is not null.(TODO opt for this case)
  */
 static void last_function(SQLFunctionCtx *pCtx) {
-  if (pCtx->order == TSQL_SO_ASC) {
+  if (pCtx->order == TSDB_ORDER_ASC) {
     return;
   }
   
@@ -1683,7 +1683,7 @@ static void last_function(SQLFunctionCtx *pCtx) {
 }
 
 static void last_function_f(SQLFunctionCtx *pCtx, int32_t index) {
-  if (pCtx->order == TSQL_SO_ASC) {
+  if (pCtx->order == TSDB_ORDER_ASC) {
     return;
   }
   
@@ -1730,7 +1730,7 @@ static void last_dist_function(SQLFunctionCtx *pCtx) {
    * 1. for scan data in asc order, no need to check data
    * 2. for data blocks that are not loaded, no need to check data
    */
-  if (pCtx->order == TSQL_SO_ASC) {
+  if (pCtx->order == TSDB_ORDER_ASC) {
     return;
   }
   
@@ -1768,7 +1768,7 @@ static void last_dist_function_f(SQLFunctionCtx *pCtx, int32_t index) {
    * 1. for scan data in asc order, no need to check data
    * 2. for data blocks that are not loaded, no need to check data
    */
-  if (pCtx->order == TSQL_SO_ASC) {
+  if (pCtx->order == TSDB_ORDER_ASC) {
     return;
   }
   
@@ -2420,10 +2420,10 @@ static void top_bottom_func_finalizer(SQLFunctionCtx *pCtx) {
   
   // user specify the order of output by sort the result according to timestamp
   if (pCtx->param[1].i64Key == PRIMARYKEY_TIMESTAMP_COL_INDEX) {
-    __compar_fn_t comparator = (pCtx->param[2].i64Key == TSQL_SO_ASC) ? resAscComparFn : resDescComparFn;
+    __compar_fn_t comparator = (pCtx->param[2].i64Key == TSDB_ORDER_ASC) ? resAscComparFn : resDescComparFn;
     qsort(tvp, pResInfo->numOfRes, POINTER_BYTES, comparator);
   } else if (pCtx->param[1].i64Key > PRIMARYKEY_TIMESTAMP_COL_INDEX) {
-    __compar_fn_t comparator = (pCtx->param[2].i64Key == TSQL_SO_ASC) ? resDataAscComparFn : resDataDescComparFn;
+    __compar_fn_t comparator = (pCtx->param[2].i64Key == TSDB_ORDER_ASC) ? resDataAscComparFn : resDataDescComparFn;
     qsort(tvp, pResInfo->numOfRes, POINTER_BYTES, comparator);
   }
   
@@ -2449,7 +2449,7 @@ static bool percentile_function_setup(SQLFunctionCtx *pCtx) {
   int32_t    orderIdx = 0;
   
   // tOrderDesc object
-  tOrderDescriptor *pDesc = tOrderDesCreate(&orderIdx, NUMOFCOLS, pModel, TSQL_SO_DESC);
+  tOrderDescriptor *pDesc = tOrderDesCreate(&orderIdx, NUMOFCOLS, pModel, TSDB_ORDER_DESC);
   
   ((SPercentileInfo *)(pResInfo->interResultBuf))->pMemBucket =
       tMemBucketCreate(1024, MAX_AVAILABLE_BUFFER_SIZE, pCtx->inputBytes, pCtx->inputType, pDesc);
@@ -2916,7 +2916,7 @@ static void col_project_function(SQLFunctionCtx *pCtx) {
   INC_INIT_VAL(pCtx, pCtx->size);
   
   char *pData = GET_INPUT_CHAR(pCtx);
-  if (pCtx->order == TSQL_SO_ASC) {
+  if (pCtx->order == TSDB_ORDER_ASC) {
     memcpy(pCtx->aOutputBuf, pData, (size_t)pCtx->size * pCtx->inputBytes);
   } else {
     for(int32_t i = 0; i < pCtx->size; ++i) {
@@ -3011,7 +3011,7 @@ static void diff_function(SQLFunctionCtx *pCtx) {
   int32_t notNullElems = 0;
   
   int32_t step = GET_FORWARD_DIRECTION_FACTOR(pCtx->order);
-  int32_t i = (pCtx->order == TSQL_SO_ASC) ? 0 : pCtx->size - 1;
+  int32_t i = (pCtx->order == TSDB_ORDER_ASC) ? 0 : pCtx->size - 1;
   
   TSKEY * pTimestamp = pCtx->ptsOutputBuf;
   
@@ -3028,7 +3028,7 @@ static void diff_function(SQLFunctionCtx *pCtx) {
         if (pCtx->param[1].nType == INITIAL_VALUE_NOT_ASSIGNED) {  // initial value is not set yet
           pCtx->param[1].i64Key = pData[i];
           pCtx->param[1].nType = pCtx->inputType;
-        } else if ((i == 0 && pCtx->order == TSQL_SO_ASC) || (i == pCtx->size - 1 && pCtx->order == TSQL_SO_DESC)) {
+        } else if ((i == 0 && pCtx->order == TSDB_ORDER_ASC) || (i == pCtx->size - 1 && pCtx->order == TSDB_ORDER_DESC)) {
           *pOutput = pData[i] - pCtx->param[1].i64Key;
           *pTimestamp = pCtx->ptsList[i];
           
@@ -3060,7 +3060,7 @@ static void diff_function(SQLFunctionCtx *pCtx) {
         if (pCtx->param[1].nType == INITIAL_VALUE_NOT_ASSIGNED) {  // initial value is not set yet
           pCtx->param[1].i64Key = pData[i];
           pCtx->param[1].nType = pCtx->inputType;
-        } else if ((i == 0 && pCtx->order == TSQL_SO_ASC) || (i == pCtx->size - 1 && pCtx->order == TSQL_SO_DESC)) {
+        } else if ((i == 0 && pCtx->order == TSDB_ORDER_ASC) || (i == pCtx->size - 1 && pCtx->order == TSDB_ORDER_DESC)) {
           *pOutput = pData[i] - pCtx->param[1].i64Key;
           *pTimestamp = pCtx->ptsList[i];
           
@@ -3092,7 +3092,7 @@ static void diff_function(SQLFunctionCtx *pCtx) {
         if (pCtx->param[1].nType == INITIAL_VALUE_NOT_ASSIGNED) {  // initial value is not set yet
           pCtx->param[1].dKey = pData[i];
           pCtx->param[1].nType = pCtx->inputType;
-        } else if ((i == 0 && pCtx->order == TSQL_SO_ASC) || (i == pCtx->size - 1 && pCtx->order == TSQL_SO_DESC)) {
+        } else if ((i == 0 && pCtx->order == TSDB_ORDER_ASC) || (i == pCtx->size - 1 && pCtx->order == TSDB_ORDER_DESC)) {
           *pOutput = pData[i] - pCtx->param[1].dKey;
           *pTimestamp = pCtx->ptsList[i];
           pOutput += 1;
@@ -3122,7 +3122,7 @@ static void diff_function(SQLFunctionCtx *pCtx) {
         if (pCtx->param[1].nType == INITIAL_VALUE_NOT_ASSIGNED) {  // initial value is not set yet
           pCtx->param[1].dKey = pData[i];
           pCtx->param[1].nType = pCtx->inputType;
-        } else if ((i == 0 && pCtx->order == TSQL_SO_ASC) || (i == pCtx->size - 1 && pCtx->order == TSQL_SO_DESC)) {
+        } else if ((i == 0 && pCtx->order == TSDB_ORDER_ASC) || (i == pCtx->size - 1 && pCtx->order == TSDB_ORDER_DESC)) {
           *pOutput = pData[i] - pCtx->param[1].dKey;
           *pTimestamp = pCtx->ptsList[i];
           
@@ -3155,7 +3155,7 @@ static void diff_function(SQLFunctionCtx *pCtx) {
         if (pCtx->param[1].nType == INITIAL_VALUE_NOT_ASSIGNED) {  // initial value is not set yet
           pCtx->param[1].i64Key = pData[i];
           pCtx->param[1].nType = pCtx->inputType;
-        } else if ((i == 0 && pCtx->order == TSQL_SO_ASC) || (i == pCtx->size - 1 && pCtx->order == TSQL_SO_DESC)) {
+        } else if ((i == 0 && pCtx->order == TSDB_ORDER_ASC) || (i == pCtx->size - 1 && pCtx->order == TSDB_ORDER_DESC)) {
           *pOutput = pData[i] - pCtx->param[1].i64Key;
           *pTimestamp = pCtx->ptsList[i];
           pOutput += 1;
@@ -3186,7 +3186,7 @@ static void diff_function(SQLFunctionCtx *pCtx) {
         if (pCtx->param[1].nType == INITIAL_VALUE_NOT_ASSIGNED) {  // initial value is not set yet
           pCtx->param[1].i64Key = pData[i];
           pCtx->param[1].nType = pCtx->inputType;
-        } else if ((i == 0 && pCtx->order == TSQL_SO_ASC) || (i == pCtx->size - 1 && pCtx->order == TSQL_SO_DESC)) {
+        } else if ((i == 0 && pCtx->order == TSDB_ORDER_ASC) || (i == pCtx->size - 1 && pCtx->order == TSDB_ORDER_DESC)) {
           *pOutput = pData[i] - pCtx->param[1].i64Key;
           *pTimestamp = pCtx->ptsList[i];
           
@@ -3298,17 +3298,17 @@ char *arithmetic_callback_function(void *param, char *name, int32_t colId) {
   SArithmeticSupport *pSupport = (SArithmeticSupport *)param;
   
   SSqlFunctionExpr *pExpr = pSupport->pExpr;
-  int32_t           colIndexInBuf = -1;
+  int32_t           colIndex = -1;
   
   for (int32_t i = 0; i < pExpr->binExprInfo.numOfCols; ++i) {
     if (colId == pExpr->binExprInfo.pReqColumns[i].colId) {
-      colIndexInBuf = pExpr->binExprInfo.pReqColumns[i].colIdxInBuf;
+      colIndex = pExpr->binExprInfo.pReqColumns[i].colIndex;
       break;
     }
   }
   
-  assert(colIndexInBuf >= 0 && colId >= 0);
-  return pSupport->data[colIndexInBuf] + pSupport->offset * pSupport->elemSize[colIndexInBuf];
+  assert(colIndex >= 0 && colId >= 0);
+  return pSupport->data[colIndex] + pSupport->offset * pSupport->elemSize[colIndex];
 }
 
 static void arithmetic_function(SQLFunctionCtx *pCtx) {
@@ -4327,7 +4327,7 @@ static void ts_comp_function(SQLFunctionCtx *pCtx) {
   const char *input = GET_INPUT_CHAR(pCtx);
   
   // primary ts must be existed, so no need to check its existance
-  if (pCtx->order == TSQL_SO_ASC) {
+  if (pCtx->order == TSDB_ORDER_ASC) {
     tsBufAppend(pTSbuf, 0, pCtx->tag.i64Key, input, pCtx->size * TSDB_KEYSIZE);
   } else {
     for (int32_t i = pCtx->size - 1; i >= 0; --i) {
diff --git a/src/client/src/tscLocal.c b/src/client/src/tscLocal.c
index 1c738ecb3dcdade6f0ff341c320febbfbeda5e77..41d5febab5cab2011fab07f6c084286004d1b0eb 100644
--- a/src/client/src/tscLocal.c
+++ b/src/client/src/tscLocal.c
@@ -240,7 +240,7 @@ static int32_t tscBuildMeterSchemaResultFields(SSqlObj *pSql, int32_t numOfCols,
   pCmd->numOfCols = numOfCols;
 
   SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(pCmd, 0);
-  pQueryInfo->order.order = TSQL_SO_ASC;
+  pQueryInfo->order.order = TSDB_ORDER_ASC;
 
   tscFieldInfoSetValue(&pQueryInfo->fieldsInfo, 0, TSDB_DATA_TYPE_BINARY, "Field", TSDB_COL_NAME_LEN);
   rowLen += TSDB_COL_NAME_LEN;
@@ -322,7 +322,7 @@ static int tscBuildMetricTagProjectionResult(SSqlObj *pSql) {
       STableIdInfo *pSidExt = tscGetMeterSidInfo(pSidList, j);
       
       for (int32_t k = 0; k < pQueryInfo->fieldsInfo.numOfOutputCols; ++k) {
-        SColIndexEx *pColIndex = &tscSqlExprGet(pQueryInfo, k)->colInfo;
+        SColIndex *pColIndex = &tscSqlExprGet(pQueryInfo, k)->colInfo;
         int16_t      offsetId = pColIndex->colIdx;
 
         assert((pColIndex->flag & TSDB_COL_TAG) != 0);
@@ -460,7 +460,7 @@ void tscSetLocalQueryResult(SSqlObj *pSql, const char *val, const char *columnNa
   pCmd->numOfCols = 1;
   
   SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);
-  pQueryInfo->order.order = TSQL_SO_ASC;
+  pQueryInfo->order.order = TSDB_ORDER_ASC;
   
   tscClearFieldInfo(&pQueryInfo->fieldsInfo);
   
diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 4462af7f950b069d774ff4222310fae367d9f592..630e439397b4700f72ffcc8575cd8b0d200abc0c 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -45,7 +45,7 @@ typedef struct SColumnList {
   SColumnIndex ids[TSDB_MAX_COLUMNS];
 } SColumnList;
 
-static SSqlExpr* doAddProjectCol(SQueryInfo* pQueryInfo, int32_t outputIndex, int32_t colIdx, int32_t tableIndex);
+static SSqlExpr* doAddProjectCol(SQueryInfo* pQueryInfo, int32_t outputIndex, int32_t colIndex, int32_t tableIndex);
 
 static int32_t setShowInfo(SSqlObj* pSql, SSqlInfo* pInfo);
 static char*   getAccountId(SSqlObj* pSql);
@@ -61,7 +61,7 @@ static int32_t setObjFullName(char* fullName, const char* account, SSQLToken* pD
 static void getColumnName(tSQLExprItem* pItem, char* resultFieldName, int32_t nameLength);
 static void getRevisedName(char* resultFieldName, int32_t functionId, int32_t maxLen, char* columnName);
 
-static int32_t addExprAndResultField(SQueryInfo* pQueryInfo, int32_t colIdx, tSQLExprItem* pItem, bool finalResult);
+static int32_t addExprAndResultField(SQueryInfo* pQueryInfo, int32_t colIndex, tSQLExprItem* pItem, bool finalResult);
 static int32_t insertResultField(SQueryInfo* pQueryInfo, int32_t outputIndex, SColumnList* pIdList, int16_t bytes,
                                  int8_t type, char* fieldName, SSqlExpr* pSqlExpr);
 static int32_t changeFunctionID(int32_t optr, int16_t* functionId);
@@ -116,9 +116,7 @@ static int32_t doCheckForCreateTable(SSqlObj* pSql, int32_t subClauseIndex, SSql
 static int32_t doCheckForCreateFromStable(SSqlObj* pSql, SSqlInfo* pInfo);
 static int32_t doCheckForStream(SSqlObj* pSql, SSqlInfo* pInfo);
 static int32_t doCheckForQuery(SSqlObj* pSql, SQuerySQL* pQuerySql, int32_t index);
-
-static int32_t convertSyntaxTreeToExprTree(tExprNode **pExpr, tSQLExpr* pAst, int32_t* num,
-    SColIndexEx** pColIndex, SSqlExprInfo* pExprInfo);
+static int32_t exprTreeFromSqlExpr(tExprNode **pExpr, tSQLExpr* pSqlExpr, SSqlExprInfo* pExprInfo, SQueryInfo* pQueryInfo, SArray* pCols);
 
 /*
  * Used during parsing query sql. Since the query sql usually small in length, error position
@@ -136,7 +134,7 @@ static int32_t tscQueryOnlyMetricTags(SQueryInfo* pQueryInfo, bool* queryOnMetri
     SSqlExpr* pExpr = tscSqlExprGet(pQueryInfo, i);
 
     if (pExpr->functionId != TSDB_FUNC_TAGPRJ &&
-        !(pExpr->functionId == TSDB_FUNC_COUNT && pExpr->colInfo.colIdx == TSDB_TBNAME_COLUMN_INDEX)) {
+        !(pExpr->functionId == TSDB_FUNC_COUNT && pExpr->colInfo.colIndex == TSDB_TBNAME_COLUMN_INDEX)) {
       *queryOnMetricTags = false;
       break;
     }
@@ -1209,28 +1207,29 @@ int32_t parseSelectClause(SSqlCmd* pCmd, int32_t clauseIndex, tSQLExprList* pSel
           SSqlBinaryExprInfo* pBinExprInfo = &pFuncExpr->binExprInfo;
           
           tExprNode* pNode = NULL;
-          SColIndexEx* pColIndex = NULL;
+//          SArray* colList = taosArrayInit(10, sizeof(SColIndex));
           
-          int32_t ret = convertSyntaxTreeToExprTree(&pNode, pItem->pNode, &pBinExprInfo->numOfCols, &pColIndex, &pQueryInfo->exprsInfo);
+          int32_t ret = exprTreeFromSqlExpr(&pNode, pItem->pNode, &pQueryInfo->exprsInfo, pQueryInfo, NULL);
           if (ret != TSDB_CODE_SUCCESS) {
             tExprTreeDestroy(&pNode, NULL);
             return invalidSqlErrMsg(pQueryInfo->msg, "invalid expression in select clause");
           }
           
           pBinExprInfo->pBinExpr = pNode;
-          pBinExprInfo->pReqColumns = pColIndex;
+          assert(0);
+//          pBinExprInfo->pReqColumns = pColIndex;
           
           for(int32_t k = 0; k < pBinExprInfo->numOfCols; ++k) {
-            SColIndexEx* pCol = &pBinExprInfo->pReqColumns[k];
+            SColIndex* pCol = &pBinExprInfo->pReqColumns[k];
             for(int32_t f = 0; f < pQueryInfo->exprsInfo.numOfExprs; ++f) {
               SSqlExpr* pExpr = tscSqlExprGet(pQueryInfo, f);
               if (strcmp(pExpr->aliasName, pCol->name) == 0) {
-                pCol->colIdxInBuf = f;
+                pCol->colIndex = f;
                 break;
               }
             }
             
-            assert(pCol->colIdxInBuf >= 0 && pCol->colIdxInBuf < pQueryInfo->exprsInfo.numOfExprs);
+            assert(pCol->colIndex >= 0 && pCol->colIndex < pQueryInfo->exprsInfo.numOfExprs);
             tfree(pNode);
           }
         }
@@ -1288,23 +1287,23 @@ int32_t insertResultField(SQueryInfo* pQueryInfo, int32_t outputIndex, SColumnLi
   return TSDB_CODE_SUCCESS;
 }
 
-SSqlExpr* doAddProjectCol(SQueryInfo* pQueryInfo, int32_t outputIndex, int32_t colIdx, int32_t tableIndex) {
+SSqlExpr* doAddProjectCol(SQueryInfo* pQueryInfo, int32_t outputIndex, int32_t colIndex, int32_t tableIndex) {
   STableMetaInfo* pTableMetaInfo = tscGetMetaInfo(pQueryInfo, tableIndex);
   STableMeta*     pTableMeta = pTableMetaInfo->pTableMeta;
   int32_t numOfCols = tscGetNumOfColumns(pTableMeta);
   
-  SSchema* pSchema = tscGetTableColumnSchema(pTableMeta, colIdx);
+  SSchema* pSchema = tscGetTableColumnSchema(pTableMeta, colIndex);
 
-  int16_t functionId = (int16_t)((colIdx >= numOfCols) ? TSDB_FUNC_TAGPRJ : TSDB_FUNC_PRJ);
+  int16_t functionId = (int16_t)((colIndex >= numOfCols) ? TSDB_FUNC_TAGPRJ : TSDB_FUNC_PRJ);
 
   if (functionId == TSDB_FUNC_TAGPRJ) {
-//    addRequiredTagColumn(pQueryInfo, colIdx - numOfCols, tableIndex);
+//    addRequiredTagColumn(pQueryInfo, colIndex - numOfCols, tableIndex);
     pQueryInfo->type = TSDB_QUERY_TYPE_STABLE_QUERY;
   } else {
     pQueryInfo->type = TSDB_QUERY_TYPE_PROJECTION_QUERY;
   }
 
-  SColumnIndex index = {tableIndex, colIdx};
+  SColumnIndex index = {tableIndex, colIndex};
   SSqlExpr*    pExpr =
       tscSqlExprInsert(pQueryInfo, outputIndex, functionId, &index, pSchema->type, pSchema->bytes, pSchema->bytes);
 
@@ -1503,7 +1502,7 @@ static int32_t setExprInfoForFunctions(SQueryInfo* pQueryInfo, SSchema* pSchema,
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t addExprAndResultField(SQueryInfo* pQueryInfo, int32_t colIdx, tSQLExprItem* pItem, bool finalResult) {
+int32_t addExprAndResultField(SQueryInfo* pQueryInfo, int32_t colIndex, tSQLExprItem* pItem, bool finalResult) {
   STableMetaInfo* pTableMetaInfo = NULL;
   int32_t         optr = pItem->pNode->nSQLOptr;
 
@@ -1547,7 +1546,7 @@ int32_t addExprAndResultField(SQueryInfo* pQueryInfo, int32_t colIdx, tSQLExprIt
 
           index = (SColumnIndex){0, PRIMARYKEY_TIMESTAMP_COL_INDEX};
           int32_t size = tDataTypeDesc[TSDB_DATA_TYPE_BIGINT].nSize;
-          pExpr = tscSqlExprInsert(pQueryInfo, colIdx, functionID, &index, TSDB_DATA_TYPE_BIGINT, size, size);
+          pExpr = tscSqlExprInsert(pQueryInfo, colIndex, functionID, &index, TSDB_DATA_TYPE_BIGINT, size, size);
         } else {
           // count the number of meters created according to the metric
           if (getColumnIndexByName(pToken, pQueryInfo, &index) != TSDB_CODE_SUCCESS) {
@@ -1562,13 +1561,13 @@ int32_t addExprAndResultField(SQueryInfo* pQueryInfo, int32_t colIdx, tSQLExprIt
           }
 
           int32_t size = tDataTypeDesc[TSDB_DATA_TYPE_BIGINT].nSize;
-          pExpr = tscSqlExprInsert(pQueryInfo, colIdx, functionID, &index, TSDB_DATA_TYPE_BIGINT, size, size);
+          pExpr = tscSqlExprInsert(pQueryInfo, colIndex, functionID, &index, TSDB_DATA_TYPE_BIGINT, size, size);
         }
       } else {  // count(*) is equalled to count(primary_timestamp_key)
         index = (SColumnIndex){0, PRIMARYKEY_TIMESTAMP_COL_INDEX};
 
         int32_t size = tDataTypeDesc[TSDB_DATA_TYPE_BIGINT].nSize;
-        pExpr = tscSqlExprInsert(pQueryInfo, colIdx, functionID, &index, TSDB_DATA_TYPE_BIGINT, size, size);
+        pExpr = tscSqlExprInsert(pQueryInfo, colIndex, functionID, &index, TSDB_DATA_TYPE_BIGINT, size, size);
       }
       
       memset(pExpr->aliasName, 0, tListLen(pExpr->aliasName));
@@ -1646,7 +1645,7 @@ int32_t addExprAndResultField(SQueryInfo* pQueryInfo, int32_t colIdx, tSQLExprIt
 
       // set the first column ts for diff query
       if (optr == TK_DIFF) {
-        colIdx += 1;
+        colIndex += 1;
         SColumnIndex indexTS = {.tableIndex = index.tableIndex, .columnIndex = 0};
         SSqlExpr* pExpr = tscSqlExprInsert(pQueryInfo, 0, TSDB_FUNC_TS_DUMMY, &indexTS, TSDB_DATA_TYPE_TIMESTAMP, TSDB_KEYSIZE,
                          TSDB_KEYSIZE);
@@ -1660,7 +1659,7 @@ int32_t addExprAndResultField(SQueryInfo* pQueryInfo, int32_t colIdx, tSQLExprIt
         return invalidSqlErrMsg(pQueryInfo->msg, msg6);
       }
 
-      SSqlExpr* pExpr = tscSqlExprInsert(pQueryInfo, colIdx, functionID, &index, resultType, resultSize, resultSize);
+      SSqlExpr* pExpr = tscSqlExprInsert(pQueryInfo, colIndex, functionID, &index, resultType, resultSize, resultSize);
 
       if (optr == TK_LEASTSQUARES) {
         /* set the leastsquares parameters */
@@ -1737,7 +1736,7 @@ int32_t addExprAndResultField(SQueryInfo* pQueryInfo, int32_t colIdx, tSQLExprIt
 
             for (int32_t j = 0; j < tscGetNumOfColumns(pTableMetaInfo->pTableMeta); ++j) {
               index.columnIndex = j;
-              if (setExprInfoForFunctions(pQueryInfo, pSchema, functionID, pItem->aliasName, colIdx++, &index) != 0) {
+              if (setExprInfoForFunctions(pQueryInfo, pSchema, functionID, pItem->aliasName, colIndex++, &index) != 0) {
                 return TSDB_CODE_INVALID_SQL;
               }
             }
@@ -1755,7 +1754,7 @@ int32_t addExprAndResultField(SQueryInfo* pQueryInfo, int32_t colIdx, tSQLExprIt
               return invalidSqlErrMsg(pQueryInfo->msg, msg6);
             }
 
-            if (setExprInfoForFunctions(pQueryInfo, pSchema, functionID, pItem->aliasName, colIdx + i, &index) != 0) {
+            if (setExprInfoForFunctions(pQueryInfo, pSchema, functionID, pItem->aliasName, colIndex + i, &index) != 0) {
               return TSDB_CODE_INVALID_SQL;
             }
           }
@@ -1771,7 +1770,7 @@ int32_t addExprAndResultField(SQueryInfo* pQueryInfo, int32_t colIdx, tSQLExprIt
 
           for (int32_t i = 0; i < tscGetNumOfColumns(pTableMetaInfo->pTableMeta); ++i) {
             SColumnIndex index = {.tableIndex = j, .columnIndex = i};
-            if (setExprInfoForFunctions(pQueryInfo, pSchema, functionID, pItem->aliasName, colIdx + i + j, &index) !=
+            if (setExprInfoForFunctions(pQueryInfo, pSchema, functionID, pItem->aliasName, colIndex + i + j, &index) !=
                 0) {
               return TSDB_CODE_INVALID_SQL;
             }
@@ -1852,7 +1851,7 @@ int32_t addExprAndResultField(SQueryInfo* pQueryInfo, int32_t colIdx, tSQLExprIt
           return TSDB_CODE_INVALID_SQL;
         }
 
-        pExpr = tscSqlExprInsert(pQueryInfo, colIdx, functionId, &index, resultType, resultSize, resultSize);
+        pExpr = tscSqlExprInsert(pQueryInfo, colIndex, functionId, &index, resultType, resultSize, resultSize);
         addExprParams(pExpr, val, TSDB_DATA_TYPE_DOUBLE, sizeof(double), 0);
       } else {
         tVariantDump(pVariant, val, TSDB_DATA_TYPE_BIGINT);
@@ -1876,9 +1875,9 @@ int32_t addExprAndResultField(SQueryInfo* pQueryInfo, int32_t colIdx, tSQLExprIt
         insertResultField(pQueryInfo, TS_COLUMN_INDEX, &ids, TSDB_KEYSIZE, TSDB_DATA_TYPE_TIMESTAMP,
                           aAggs[TSDB_FUNC_TS].aName, pExpr);
 
-        colIdx += 1;  // the first column is ts
+        colIndex += 1;  // the first column is ts
 
-        pExpr = tscSqlExprInsert(pQueryInfo, colIdx, functionId, &index, resultType, resultSize, resultSize);
+        pExpr = tscSqlExprInsert(pQueryInfo, colIndex, functionId, &index, resultType, resultSize, resultSize);
         addExprParams(pExpr, val, TSDB_DATA_TYPE_BIGINT, sizeof(int64_t), 0);
       }
   
@@ -1887,7 +1886,7 @@ int32_t addExprAndResultField(SQueryInfo* pQueryInfo, int32_t colIdx, tSQLExprIt
   
       SColumnList ids = getColumnList(1, 0, index.columnIndex);
       if (finalResult) {
-        insertResultField(pQueryInfo, colIdx, &ids, resultSize, resultType, pExpr->aliasName, pExpr);
+        insertResultField(pQueryInfo, colIndex, &ids, resultSize, resultType, pExpr->aliasName, pExpr);
       } else {
         for (int32_t i = 0; i < ids.num; ++i) {
           tscColumnBaseInfoInsert(pQueryInfo, &(ids.ids[i]));
@@ -2275,7 +2274,7 @@ int32_t tscTansformSQLFunctionForSTableQuery(SQueryInfo* pQueryInfo) {
     SSqlExpr*   pExpr = tscSqlExprGet(pQueryInfo, k);
     int16_t functionId = aAggs[pExpr->functionId].stableFuncId;
 
-    int32_t colIndex = pExpr->colInfo.colIdx;
+    int32_t colIndex = pExpr->colInfo.colIndex;
     SSchema* pSrcSchema = tscGetTableColumnSchema(pTableMetaInfo->pTableMeta, colIndex);
     
     if ((functionId >= TSDB_FUNC_SUM && functionId <= TSDB_FUNC_TWA) ||
@@ -2286,7 +2285,7 @@ int32_t tscTansformSQLFunctionForSTableQuery(SQueryInfo* pQueryInfo) {
         return TSDB_CODE_INVALID_SQL;
       }
 
-      tscSqlExprUpdate(pQueryInfo, k, functionId, pExpr->colInfo.colIdx, TSDB_DATA_TYPE_BINARY, bytes);
+      tscSqlExprUpdate(pQueryInfo, k, functionId, pExpr->colInfo.colIndex, TSDB_DATA_TYPE_BINARY, bytes);
       // todo refactor
       pExpr->interResBytes = intermediateBytes;
     }
@@ -2305,7 +2304,7 @@ void tscRestoreSQLFunctionForMetricQuery(SQueryInfo* pQueryInfo) {
 
   for (int32_t i = 0; i < pQueryInfo->exprsInfo.numOfExprs; ++i) {
     SSqlExpr*   pExpr = tscSqlExprGet(pQueryInfo, i);
-    SSchema* pSchema = tscGetTableColumnSchema(pTableMetaInfo->pTableMeta, pExpr->colInfo.colIdx);
+    SSchema* pSchema = tscGetTableColumnSchema(pTableMetaInfo->pTableMeta, pExpr->colInfo.colIndex);
     
 //    if (/*(pExpr->functionId >= TSDB_FUNC_FIRST_DST && pExpr->functionId <= TSDB_FUNC_LAST_DST) ||
 //        (pExpr->functionId >= TSDB_FUNC_SUM && pExpr->functionId <= TSDB_FUNC_MAX) ||
@@ -2352,7 +2351,7 @@ bool hasUnsupportFunctionsForSTableQuery(SQueryInfo* pQueryInfo) {
     }
 
     if (pQueryInfo->groupbyExpr.numOfGroupCols != 1 ||
-        pQueryInfo->groupbyExpr.columnInfo[0].colIdx != TSDB_TBNAME_COLUMN_INDEX) {
+        pQueryInfo->groupbyExpr.columnInfo[0].colIndex != TSDB_TBNAME_COLUMN_INDEX) {
       invalidSqlErrMsg(pQueryInfo->msg, msg2);
       return true;
     }
@@ -2403,12 +2402,12 @@ void updateTagColumnIndex(SQueryInfo* pQueryInfo, int32_t tableIndex) {
    */
   if (pQueryInfo->groupbyExpr.numOfGroupCols > 0 && pQueryInfo->groupbyExpr.tableIndex == tableIndex) {
     for (int32_t i = 0; i < pQueryInfo->groupbyExpr.numOfGroupCols; ++i) {
-      int32_t index = pQueryInfo->groupbyExpr.columnInfo[i].colIdx;
+      int32_t index = pQueryInfo->groupbyExpr.columnInfo[i].colIndex;
 
       for (int32_t j = 0; j < pTableMetaInfo->numOfTags; ++j) {
         int32_t tagColIndex = pTableMetaInfo->tagColumnIndex[j];
         if (tagColIndex == index) {
-          pQueryInfo->groupbyExpr.columnInfo[i].colIdx = j;
+          pQueryInfo->groupbyExpr.columnInfo[i].colIndex = j;
           break;
         }
       }
@@ -2429,8 +2428,8 @@ void updateTagColumnIndex(SQueryInfo* pQueryInfo, int32_t tableIndex) {
     }
 
     for (int32_t j = 0; j < pTableMetaInfo->numOfTags; ++j) {
-      if (pExpr->colInfo.colIdx == pTableMetaInfo->tagColumnIndex[j]) {
-        pExpr->colInfo.colIdx = j;
+      if (pExpr->colInfo.colIndex == pTableMetaInfo->tagColumnIndex[j]) {
+        pExpr->colInfo.colIndex = j;
         break;
       }
     }
@@ -2529,8 +2528,8 @@ int32_t parseGroupbyClause(SQueryInfo* pQueryInfo, tVariantList* pList, SSqlCmd*
       }
 
       pQueryInfo->groupbyExpr.columnInfo[i] =
-          (SColIndexEx){.colIdx = relIndex, .flag = TSDB_COL_TAG, .colId = pSchema->colId};  // relIndex;
-      addRequiredTagColumn(pQueryInfo, pQueryInfo->groupbyExpr.columnInfo[i].colIdx, index.tableIndex);
+          (SColIndex){.colIndex = relIndex, .flag = TSDB_COL_TAG, .colId = pSchema->colId};  // relIndex;
+      addRequiredTagColumn(pQueryInfo, pQueryInfo->groupbyExpr.columnInfo[i].colIndex, index.tableIndex);
     } else {
       // check if the column type is valid, here only support the bool/tinyint/smallint/bigint group by
       if (pSchema->type > TSDB_DATA_TYPE_BINARY) {
@@ -2539,8 +2538,8 @@ int32_t parseGroupbyClause(SQueryInfo* pQueryInfo, tVariantList* pList, SSqlCmd*
 
       tscColumnBaseInfoInsert(pQueryInfo, &index);
       pQueryInfo->groupbyExpr.columnInfo[i] =
-          (SColIndexEx){.colIdx = index.columnIndex, .flag = TSDB_COL_NORMAL, .colId = pSchema->colId};  // relIndex;
-      pQueryInfo->groupbyExpr.orderType = TSQL_SO_ASC;
+          (SColIndex){.colIndex = index.columnIndex, .flag = TSDB_COL_NORMAL, .colId = pSchema->colId};  // relIndex;
+      pQueryInfo->groupbyExpr.orderType = TSDB_ORDER_ASC;
 
       if (i == 0 && pList->nExpr > 1) {
         return invalidSqlErrMsg(pQueryInfo->msg, msg7);
@@ -2630,10 +2629,10 @@ static int32_t doExtractColumnFilterInfo(SQueryInfo* pQueryInfo, SColumnFilterIn
       pColumnFilter->upperRelOptr = TSDB_RELATION_LESS;
       break;
     case TK_GT:
-      pColumnFilter->lowerRelOptr = TSDB_RELATION_LARGE;
+      pColumnFilter->lowerRelOptr = TSDB_RELATION_GREATER;
       break;
     case TK_GE:
-      pColumnFilter->lowerRelOptr = TSDB_RELATION_LARGE_EQUAL;
+      pColumnFilter->lowerRelOptr = TSDB_RELATION_GREATER_EQUAL;
       break;
     case TK_EQ:
       pColumnFilter->lowerRelOptr = TSDB_RELATION_EQUAL;
@@ -2892,6 +2891,7 @@ static void relToString(tSQLExpr* pExpr, char** str) {
   }
 }
 
+UNUSED_FUNC
 static int32_t getTagCondString(tSQLExpr* pExpr, char** str) {
   if (pExpr == NULL) {
     return TSDB_CODE_SUCCESS;
@@ -3593,7 +3593,7 @@ static bool validateFilterExpr(SQueryInfo* pQueryInfo) {
       int32_t            lowerOptr = pColFilter->lowerRelOptr;
       int32_t            upperOptr = pColFilter->upperRelOptr;
 
-      if ((lowerOptr == TSDB_RELATION_LARGE_EQUAL || lowerOptr == TSDB_RELATION_LARGE) &&
+      if ((lowerOptr == TSDB_RELATION_GREATER_EQUAL || lowerOptr == TSDB_RELATION_GREATER) &&
           (upperOptr == TSDB_RELATION_LESS_EQUAL || upperOptr == TSDB_RELATION_LESS)) {
         continue;
       }
@@ -3727,28 +3727,27 @@ static void doAddJoinTagsColumnsIntoTagList(SQueryInfo* pQueryInfo, SCondExpr* p
 static int32_t getTagQueryCondExpr(SQueryInfo* pQueryInfo, SCondExpr* pCondExpr, tSQLExpr** pExpr) {
   int32_t ret = TSDB_CODE_SUCCESS;
 
-  if (pCondExpr->pTagCond != NULL) {
-    for (int32_t i = 0; i < pQueryInfo->numOfTables; ++i) {
-      tSQLExpr* p1 = extractExprForSTable(pExpr, pQueryInfo, i);
-
-      STableMetaInfo* pTableMetaInfo = tscGetMetaInfo(pQueryInfo, i);
-
-      char  c[TSDB_MAX_TAGS_LEN] = {0};
-      char* str = c;
-
-      if ((ret = getTagCondString(p1, &str)) != TSDB_CODE_SUCCESS) {
-        return ret;
-      }
-
-      tsSetSTableQueryCond(&pQueryInfo->tagCond, pTableMetaInfo->pTableMeta->uid, c);
-
-      doCompactQueryExpr(pExpr);
-      tSQLExprDestroy(p1);
-    }
+  if (pCondExpr->pTagCond == NULL) {
+    return ret;
+  }
+  
+  for (int32_t i = 0; i < pQueryInfo->numOfTables; ++i) {
+    tSQLExpr* p1 = extractExprForSTable(pExpr, pQueryInfo, i);
+    tExprNode* p = NULL;
+    
+    ret = exprTreeFromSqlExpr(&p, p1, NULL, pQueryInfo, NULL);
+    SBuffer buf = exprTreeToBinary(p);
+    
+    int64_t uid = tscGetMetaInfo(pQueryInfo, i)->pTableMeta->uid;
+    tsSetSTableQueryCond(&pQueryInfo->tagCond, uid, &buf);
 
-    pCondExpr->pTagCond = NULL;
+    doCompactQueryExpr(pExpr);
+    
+    tSQLExprDestroy(p1);
+    tExprTreeDestroy(&p, NULL);
   }
 
+  pCondExpr->pTagCond = NULL;
   return ret;
 }
 int32_t parseWhereClause(SQueryInfo* pQueryInfo, tSQLExpr** pExpr, SSqlObj* pSql) {
@@ -4044,11 +4043,11 @@ int32_t parseFillClause(SQueryInfo* pQueryInfo, SQuerySQL* pQuerySQL) {
 
 static void setDefaultOrderInfo(SQueryInfo* pQueryInfo) {
   /* set default timestamp order information for all queries */
-  pQueryInfo->order.order = TSQL_SO_ASC;
+  pQueryInfo->order.order = TSDB_ORDER_ASC;
   STableMetaInfo* pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
 
   if (isTopBottomQuery(pQueryInfo)) {
-    pQueryInfo->order.order = TSQL_SO_ASC;
+    pQueryInfo->order.order = TSDB_ORDER_ASC;
     pQueryInfo->order.orderColId = PRIMARYKEY_TIMESTAMP_COL_INDEX;
   } else {
     pQueryInfo->order.orderColId = -1;
@@ -4056,7 +4055,7 @@ static void setDefaultOrderInfo(SQueryInfo* pQueryInfo) {
 
   /* for metric query, set default ascending order for group output */
   if (UTIL_TABLE_IS_SUPERTABLE(pTableMetaInfo)) {
-    pQueryInfo->groupbyExpr.orderType = TSQL_SO_ASC;
+    pQueryInfo->groupbyExpr.orderType = TSDB_ORDER_ASC;
   }
 }
 
@@ -4112,7 +4111,7 @@ int32_t parseOrderbyClause(SQueryInfo* pQueryInfo, SQuerySQL* pQuerySql, SSchema
 
     if (index.columnIndex >= tscGetNumOfColumns(pTableMetaInfo->pTableMeta)) {
       int32_t relTagIndex = index.columnIndex - tscGetNumOfColumns(pTableMetaInfo->pTableMeta);
-      if (relTagIndex == pQueryInfo->groupbyExpr.columnInfo[0].colIdx) {
+      if (relTagIndex == pQueryInfo->groupbyExpr.columnInfo[0].colIndex) {
         orderByTags = true;
       }
     } else if (index.columnIndex == TSDB_TBNAME_COLUMN_INDEX) {
@@ -4139,7 +4138,7 @@ int32_t parseOrderbyClause(SQueryInfo* pQueryInfo, SQuerySQL* pQuerySql, SSchema
         assert(pExpr->functionId == TSDB_FUNC_TS);
 
         pExpr = tscSqlExprGet(pQueryInfo, 1);
-        if (pExpr->colInfo.colIdx != index.columnIndex && index.columnIndex != PRIMARYKEY_TIMESTAMP_COL_INDEX) {
+        if (pExpr->colInfo.colIndex != index.columnIndex && index.columnIndex != PRIMARYKEY_TIMESTAMP_COL_INDEX) {
           return invalidSqlErrMsg(pQueryInfo->msg, msg2);
         }
 
@@ -4190,7 +4189,7 @@ int32_t parseOrderbyClause(SQueryInfo* pQueryInfo, SQuerySQL* pQuerySql, SSchema
       assert(pExpr->functionId == TSDB_FUNC_TS);
 
       pExpr = tscSqlExprGet(pQueryInfo, 1);
-      if (pExpr->colInfo.colIdx != index.columnIndex && index.columnIndex != PRIMARYKEY_TIMESTAMP_COL_INDEX) {
+      if (pExpr->colInfo.colIndex != index.columnIndex && index.columnIndex != PRIMARYKEY_TIMESTAMP_COL_INDEX) {
         return invalidSqlErrMsg(pQueryInfo->msg, msg2);
       }
 
@@ -4705,7 +4704,7 @@ int32_t parseLimitClause(SQueryInfo* pQueryInfo, int32_t clauseIndex, SQuerySQL*
     // filter the query functions operating on "tbname" column that are not supported by normal columns.
     for (int32_t i = 0; i < pQueryInfo->exprsInfo.numOfExprs; ++i) {
       SSqlExpr* pExpr = tscSqlExprGet(pQueryInfo, i);
-      if (pExpr->colInfo.colIdx == TSDB_TBNAME_COLUMN_INDEX) {
+      if (pExpr->colInfo.colIndex == TSDB_TBNAME_COLUMN_INDEX) {
         return invalidSqlErrMsg(pQueryInfo->msg, msg2);
       }
     }
@@ -4851,10 +4850,10 @@ void addGroupInfoForSubquery(SSqlObj* pParentObj, SSqlObj* pSql, int32_t subClau
 
       int32_t relIndex = index.columnIndex;
 
-      pExpr->colInfo.colIdx = relIndex;
-      pQueryInfo->groupbyExpr.columnInfo[0].colIdx = relIndex;
+      pExpr->colInfo.colIndex = relIndex;
+      pQueryInfo->groupbyExpr.columnInfo[0].colIndex = relIndex;
 
-      addRequiredTagColumn(pQueryInfo, pQueryInfo->groupbyExpr.columnInfo[0].colIdx, 0);
+      addRequiredTagColumn(pQueryInfo, pQueryInfo->groupbyExpr.columnInfo[0].colIndex, 0);
     }
   }
 }
@@ -4867,7 +4866,7 @@ static void doLimitOutputNormalColOfGroupby(SSqlExpr* pExpr) {
 }
 
 void doAddGroupColumnForSubquery(SQueryInfo* pQueryInfo, int32_t tagIndex) {
-  int32_t index = pQueryInfo->groupbyExpr.columnInfo[tagIndex].colIdx;
+  int32_t index = pQueryInfo->groupbyExpr.columnInfo[tagIndex].colIndex;
 
   STableMetaInfo* pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
 
@@ -4909,7 +4908,7 @@ static void doUpdateSqlFunctionForTagPrj(SQueryInfo* pQueryInfo) {
   for (int32_t i = 0; i < pQueryInfo->exprsInfo.numOfExprs; ++i) {
     SSqlExpr* pExpr = tscSqlExprGet(pQueryInfo, i);
     if (pExpr->functionId != TSDB_FUNC_TAG_DUMMY && pExpr->functionId != TSDB_FUNC_TS_DUMMY) {
-      SSchema* pColSchema = &pSchema[pExpr->colInfo.colIdx];
+      SSchema* pColSchema = &pSchema[pExpr->colInfo.colIndex];
       getResultDataInfo(pColSchema->type, pColSchema->bytes, pExpr->functionId, pExpr->param[0].i64Key, &pExpr->resType,
                         &pExpr->resBytes, &pExpr->interResBytes, tagLength, true);
     }
@@ -5087,16 +5086,16 @@ static int32_t doAddGroupbyColumnsOnDemand(SQueryInfo* pQueryInfo) {
   char*    name = NULL;
 
   for (int32_t i = 0; i < pQueryInfo->groupbyExpr.numOfGroupCols; ++i) {
-    SColIndexEx* pColIndex = &pQueryInfo->groupbyExpr.columnInfo[i];
+    SColIndex* pColIndex = &pQueryInfo->groupbyExpr.columnInfo[i];
 
-    int16_t colIndex = pColIndex->colIdx;
-    if (pColIndex->colIdx == TSDB_TBNAME_COLUMN_INDEX) {
+    int16_t colIndex = pColIndex->colIndex;
+    if (pColIndex->colIndex == TSDB_TBNAME_COLUMN_INDEX) {
       type = TSDB_DATA_TYPE_BINARY;
       bytes = TSDB_TABLE_NAME_LEN;
       name = TSQL_TBNAME_L;
     } else {
-      colIndex = (TSDB_COL_IS_TAG(pColIndex->flag)) ? tscGetNumOfColumns(pTableMetaInfo->pTableMeta) + pColIndex->colIdx
-                                                    : pColIndex->colIdx;
+      colIndex = (TSDB_COL_IS_TAG(pColIndex->flag)) ? tscGetNumOfColumns(pTableMetaInfo->pTableMeta) + pColIndex->colIndex
+                                                    : pColIndex->colIndex;
 
       type = pSchema[colIndex].type;
       bytes = pSchema[colIndex].bytes;
@@ -5175,7 +5174,7 @@ int32_t doFunctionsCompatibleCheck(SSqlCmd* pCmd, SQueryInfo* pQueryInfo) {
       if (functId == TSDB_FUNC_PRJ && pExpr->colInfo.colId != PRIMARYKEY_TIMESTAMP_COL_INDEX) {
         bool qualified = false;
         for (int32_t j = 0; j < pQueryInfo->groupbyExpr.numOfGroupCols; ++j) {
-          SColIndexEx* pColIndex = &pQueryInfo->groupbyExpr.columnInfo[j];
+          SColIndex* pColIndex = &pQueryInfo->groupbyExpr.columnInfo[j];
           if (pColIndex->colId == pExpr->colInfo.colId) {
             qualified = true;
             break;
@@ -5192,7 +5191,7 @@ int32_t doFunctionsCompatibleCheck(SSqlCmd* pCmd, SQueryInfo* pQueryInfo) {
         return invalidSqlErrMsg(pQueryInfo->msg, msg1);
       }
 
-      if (functId == TSDB_FUNC_COUNT && pExpr->colInfo.colIdx == TSDB_TBNAME_COLUMN_INDEX) {
+      if (functId == TSDB_FUNC_COUNT && pExpr->colInfo.colIndex == TSDB_TBNAME_COLUMN_INDEX) {
         return invalidSqlErrMsg(pQueryInfo->msg, msg1);
       }
     }
@@ -5807,37 +5806,38 @@ int32_t doCheckForQuery(SSqlObj* pSql, SQuerySQL* pQuerySql, int32_t index) {
   return TSDB_CODE_SUCCESS;  // Does not build query message here
 }
 
-static int32_t convertSyntaxTreeToExprTree(tExprNode **pExpr, tSQLExpr* pAst, int32_t* num,
-    SColIndexEx** pColIndex, SSqlExprInfo* pExprInfo) {
+int32_t exprTreeFromSqlExpr(tExprNode **pExpr, tSQLExpr* pSqlExpr, SSqlExprInfo* pExprInfo, SQueryInfo* pQueryInfo, SArray* pCols) {
   tExprNode* pLeft = NULL;
   tExprNode* pRight= NULL;
   
-  if (pAst->pLeft != NULL) {
-    int32_t ret = convertSyntaxTreeToExprTree(&pLeft, pAst->pLeft, num, pColIndex, pExprInfo);
+  if (pSqlExpr->pLeft != NULL) {
+    int32_t ret = exprTreeFromSqlExpr(&pLeft, pSqlExpr->pLeft, pExprInfo, pQueryInfo, pCols);
     if (ret != TSDB_CODE_SUCCESS) {
       return ret;
     }
   }
   
-  if (pAst->pRight != NULL) {
-    int32_t ret = convertSyntaxTreeToExprTree(&pRight, pAst->pRight, num, pColIndex, pExprInfo);
+  if (pSqlExpr->pRight != NULL) {
+    int32_t ret = exprTreeFromSqlExpr(&pRight, pSqlExpr->pRight, pExprInfo, pQueryInfo, pCols);
     if (ret != TSDB_CODE_SUCCESS) {
       return ret;
     }
   }
   
-  if (pAst->pLeft == NULL) {
-    if (pAst->nSQLOptr >= TK_TINYINT && pAst->nSQLOptr <= TK_DOUBLE) {
-      *pExpr = calloc(1, sizeof(tExprNode) + sizeof(tVariant));
+  if (pSqlExpr->pLeft == NULL) {
+    if (pSqlExpr->nSQLOptr >= TK_TINYINT && pSqlExpr->nSQLOptr <= TK_DOUBLE) {
+      *pExpr = calloc(1, sizeof(tExprNode));
       (*pExpr)->nodeType = TSQL_NODE_VALUE;
-      (*pExpr)->pVal = (tVariant*) ((char*)(*pExpr) + sizeof(tExprNode));
-      tVariantAssign((*pExpr)->pVal, &pAst->val);
-    } else if (pAst->nSQLOptr >= TK_COUNT && pAst->nSQLOptr <= TK_AVG_IRATE) {
-      *pExpr = calloc(1, sizeof(tExprNode) + sizeof(SSchemaEx));
+      (*pExpr)->pVal = calloc(1, sizeof(tVariant));
+      
+      tVariantAssign((*pExpr)->pVal, &pSqlExpr->val);
+      
+    } else if (pSqlExpr->nSQLOptr >= TK_COUNT && pSqlExpr->nSQLOptr <= TK_AVG_IRATE) {
+      *pExpr = calloc(1, sizeof(tExprNode));
       (*pExpr)->nodeType = TSQL_NODE_COL;
-      (*pExpr)->pSchema = (SSchema*)((char*)(*pExpr) + sizeof(tExprNode));
-      strncpy((*pExpr)->pSchema->name, pAst->operand.z, pAst->operand.n);
-
+      (*pExpr)->pSchema = calloc(1, sizeof(SSchema));
+      strncpy((*pExpr)->pSchema->name, pSqlExpr->operand.z, pSqlExpr->operand.n);
+      
       // set the input column data byte and type.
       for (int32_t i = 0; i < pExprInfo->numOfExprs; ++i) {
         if (strcmp((*pExpr)->pSchema->name, pExprInfo->pExprs[i]->aliasName) == 0) {
@@ -5846,22 +5846,43 @@ static int32_t convertSyntaxTreeToExprTree(tExprNode **pExpr, tSQLExpr* pAst, in
           break;
         }
       }
-    } else { //todo return error
+    } else if (pSqlExpr->nSQLOptr == TK_ID) { // column name
+      SColumnIndex index = {0};
+      int32_t ret = getColumnIndexByName(&pSqlExpr->colInfo, pQueryInfo, &index);
+      if (ret != TSDB_CODE_SUCCESS) {
+        return ret;
+      }
+  
+      *pExpr = calloc(1, sizeof(tExprNode));
+      (*pExpr)->nodeType = TSQL_NODE_COL;
+      (*pExpr)->pSchema = calloc(1, sizeof(SSchema));
+      
+      STableMeta* pTableMeta = tscGetMetaInfo(pQueryInfo, 0)->pTableMeta;
+      SSchema* pSchema = tscGetTableColumnSchema(pTableMeta, index.columnIndex);
+      *(*pExpr)->pSchema = *pSchema;
+      
       return TSDB_CODE_SUCCESS;
+    } else {
+      return TSDB_CODE_INVALID_SQL;
     }
     
-    *pColIndex = realloc(*pColIndex, (++(*num)) * sizeof(SColIndexEx));
-    memset(&(*pColIndex)[(*num) - 1], 0, sizeof(SColIndexEx));
+    if (pCols != NULL) {  // record the involved columns
+      SColIndex colIndex = {0};
+      strncpy(colIndex.name, pSqlExpr->operand.z, pSqlExpr->operand.n);
+      taosArrayPush(pCols, &colIndex);
+    }
     
-    strncpy((*pColIndex)[(*num) - 1].name, pAst->operand.z, pAst->operand.n);
   } else {
     *pExpr = (tExprNode *)calloc(1, sizeof(tExprNode));
+    (*pExpr)->nodeType = TSQL_NODE_EXPR;
+    
     (*pExpr)->_node.hasPK = false;
     (*pExpr)->_node.pLeft = pLeft;
     (*pExpr)->_node.pRight = pRight;
-    SSQLToken t = {.type = pAst->nSQLOptr};
+    
+    SSQLToken t = {.type = pSqlExpr->nSQLOptr};
     (*pExpr)->_node.optr = getBinaryExprOptr(&t);
-  
+    
     assert((*pExpr)->_node.optr != 0);
     
     if ((*pExpr)->_node.optr == TSDB_BINARY_OP_DIVIDE) {
diff --git a/src/client/src/tscSecondaryMerge.c b/src/client/src/tscSecondaryMerge.c
index 1d4ed51f32a68cb39d511f83c5ea1f47a3aeb4eb..d1ec5088d3d3d9e04e1d2b961b8bbd5a5b60290f 100644
--- a/src/client/src/tscSecondaryMerge.c
+++ b/src/client/src/tscSecondaryMerge.c
@@ -45,7 +45,7 @@ int32_t treeComparator(const void *pLeft, const void *pRight, void *param) {
     return -1;
   }
 
-  if (pParam->groupOrderType == TSQL_SO_DESC) {  // desc
+  if (pParam->groupOrderType == TSDB_ORDER_DESC) {  // desc
     return compare_d(pDesc, pParam->numOfElems, pLocalData[pLeftIdx]->rowIdx, pLocalData[pLeftIdx]->filePage.data,
                      pParam->numOfElems, pLocalData[pRightIdx]->rowIdx, pLocalData[pRightIdx]->filePage.data);
   } else {
@@ -652,7 +652,7 @@ int32_t tscLocalReducerEnvCreate(SSqlObj *pSql, tExtMemBuffer ***pMemBuffer, tOr
   for (int32_t i = 0; i < pQueryInfo->exprsInfo.numOfExprs; ++i) {
     SSqlExpr *pExpr = tscSqlExprGet(pQueryInfo, i);
 
-    SSchema *p1 = tscGetTableColumnSchema(pTableMetaInfo->pTableMeta, pExpr->colInfo.colIdx);
+    SSchema *p1 = tscGetTableColumnSchema(pTableMetaInfo->pTableMeta, pExpr->colInfo.colIndex);
 
     int16_t inter = 0;
     int16_t type = -1;
@@ -990,7 +990,7 @@ static void doInterpolateResult(SSqlObj *pSql, SLocalReducer *pLocalReducer, boo
       savePrevRecordAndSetupInterpoInfo(pLocalReducer, pQueryInfo, pInterpoInfo);
     }
 
-    if (pQueryInfo->order.order == TSQL_SO_ASC) {
+    if (pQueryInfo->order.order == TSDB_ORDER_ASC) {
       for (int32_t i = 0; i < pQueryInfo->fieldsInfo.numOfOutputCols; ++i) {
         TAOS_FIELD *pField = tscFieldInfoGetField(pQueryInfo, i);
         int16_t     offset = getColumnModelOffset(pLocalReducer->resColModel, i);
@@ -1168,7 +1168,7 @@ bool needToMerge(SQueryInfo *pQueryInfo, SLocalReducer *pLocalReducer, tFilePage
   } else {
     tOrderDescriptor *pDesc = pLocalReducer->pDesc;
     if (pDesc->orderIdx.numOfCols > 0) {
-      if (pDesc->tsOrder == TSQL_SO_ASC) {  // asc
+      if (pDesc->tsOrder == TSDB_ORDER_ASC) {  // asc
         // todo refactor comparator
         ret = compare_a(pLocalReducer->pDesc, 1, 0, pLocalReducer->prevRowOfInput, 1, 0, tmpBuffer->data);
       } else {  // desc
diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index 46c7dd589be8f18a8a4f100ea0f131563765096f..0bb3cb0dc790e571c9aa1a79761dc6faa6d3798c 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -37,12 +37,25 @@ int (*tscBuildMsg[TSDB_SQL_MAX])(SSqlObj *pSql, SSqlInfo *pInfo) = {0};
 int (*tscProcessMsgRsp[TSDB_SQL_MAX])(SSqlObj *pSql);
 void tscProcessActivityTimer(void *handle, void *tmrId);
 int tscKeepConn[TSDB_SQL_MAX] = {0};
+
 TSKEY tscGetSubscriptionProgress(void* sub, int64_t uid);
 void tscUpdateSubscriptionProgress(void* sub, int64_t uid, TSKEY ts);
 void tscSaveSubscriptionProgress(void* sub);
 
 static int32_t minMsgSize() { return tsRpcHeadSize + 100; }
 
+static void tscSetDnodeIpList(SSqlObj* pSql, STableMeta* pTableMeta) {
+  SRpcIpSet* pIpList = &pSql->ipList;
+  
+  pIpList->numOfIps = pTableMeta->numOfVpeers;
+  pIpList->port     = tsDnodeShellPort;
+  pIpList->inUse    = 0;
+  
+  for(int32_t i = 0; i < pTableMeta->numOfVpeers; ++i) {
+    pIpList->ip[i] = pTableMeta->vpeerDesc[i].ip;
+  }
+}
+
 void tscPrintMgmtIp() {
   if (tscMgmtIpList.numOfIps <= 0) {
     tscError("invalid mgmt IP list:%d", tscMgmtIpList.numOfIps);
@@ -178,17 +191,6 @@ int tscSendMsgToServer(SSqlObj *pSql) {
   }
 
   if (pSql->cmd.command < TSDB_SQL_MGMT) {
-    STableMetaInfo *pTableMetaInfo = tscGetTableMetaInfoFromCmd(pCmd, pCmd->clauseIndex, 0);
-    STableMeta* pTableMeta = pTableMetaInfo->pTableMeta;
-    
-    pSql->ipList.numOfIps = pTableMeta->numOfVpeers;
-    pSql->ipList.port     = tsDnodeShellPort;
-    pSql->ipList.inUse    = 0;
-    
-    for(int32_t i = 0; i < pTableMeta->numOfVpeers; ++i) {
-      pSql->ipList.ip[i] = pTableMeta->vpeerDesc[i].ip;
-    }
-    
     tscPrint("%p msg:%s is sent to server %d", pSql, taosMsg[pSql->cmd.msgType], pSql->ipList.port);
     memcpy(pMsg, pSql->cmd.payload + tsRpcHeadSize, pSql->cmd.payloadLen);
 
@@ -266,19 +268,18 @@ void tscProcessMsgFromServer(SRpcMsg *rpcMsg) {
         rpcFreeCont(rpcMsg->pCont);
         return;
       } else {
-        tscTrace("%p it shall renew table meta, code:%d", pSql, tstrerror(rpcMsg->code));
+        tscWarn("%p it shall renew table meta, code:%s, retry:%d", pSql, tstrerror(rpcMsg->code), ++pSql->retry);
 
-        pSql->maxRetry = TSDB_VNODES_SUPPORT * 2;
+        pSql->maxRetry = TSDB_VNODES_SUPPORT * 2;  // todo move away
         pSql->res.code = rpcMsg->code;  // keep the previous error code
-        if (++pSql->retry > pSql->maxRetry) {
-          tscError("%p max retry %d reached, ", pSql, pSql->retry);
-          return;
-        }
-        
-        rpcMsg->code = tscRenewMeterMeta(pSql, pTableMetaInfo->name);
-
-        if (pTableMetaInfo->pTableMeta) {
-          tscSendMsgToServer(pSql);
+        if (pSql->retry > pSql->maxRetry) {
+          tscError("%p max retry %d reached, give up", pSql, pSql->maxRetry);
+        } else {
+          rpcMsg->code = tscRenewMeterMeta(pSql, pTableMetaInfo->name);
+          if (pTableMetaInfo->pTableMeta) {
+            tscSendMsgToServer(pSql);
+          }
+  
           rpcFreeCont(rpcMsg->pCont);
           return;
         }
@@ -286,7 +287,11 @@ void tscProcessMsgFromServer(SRpcMsg *rpcMsg) {
     }
   }
 
-  pSql->retry = 0;
+  if (pRes->code == TSDB_CODE_SUCCESS) {
+    tscTrace("%p reset retry counter to be 0 due to success rsp, old:%d", pSql, pSql->retry);
+    pSql->retry = 0;
+  }
+  
   pRes->rspLen = 0;
   
   if (pRes->code != TSDB_CODE_QUERY_CANCELLED) {
@@ -331,7 +336,7 @@ void tscProcessMsgFromServer(SRpcMsg *rpcMsg) {
       pMsg->numOfFailedBlocks = htonl(pMsg->numOfFailedBlocks);
 
       pRes->numOfRows += pMsg->affectedRows;
-      tscTrace("%p cmd:%d code:%d, inserted rows:%d, rsp len:%d", pSql, pCmd->command, pRes->code,
+      tscTrace("%p cmd:%d code:%s, inserted rows:%d, rsp len:%d", pSql, pCmd->command, tstrerror(pRes->code),
           pMsg->affectedRows, pRes->rspLen);
     } else {
       tscTrace("%p cmd:%d code:%s rsp len:%d", pSql, pCmd->command, tstrerror(pRes->code), pRes->rspLen);
@@ -551,8 +556,9 @@ int tscBuildSubmitMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
 
   // pSql->cmd.payloadLen is set during copying data into payload
   pSql->cmd.msgType = TSDB_MSG_TYPE_SUBMIT;
-  tscTrace("%p build submit msg, vgId:%d numOfVnodes:%d", pSql, pTableMeta->vgId, htonl(pMsgDesc->numOfVnodes));
+  tscSetDnodeIpList(pSql, pTableMeta);
   
+  tscTrace("%p build submit msg, vgId:%d numOfVnodes:%d", pSql, pTableMeta->vgId, htonl(pMsgDesc->numOfVnodes));
   return TSDB_CODE_SUCCESS;
 }
 
@@ -645,15 +651,22 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
 
   if (UTIL_TABLE_IS_NOMRAL_TABLE(pTableMetaInfo)) {
     numOfTables = 1;
+    tscSetDnodeIpList(pSql, pTableMeta);
     pQueryMsg->head.vgId = htonl(pTableMeta->vgId);
     tscTrace("%p queried tables:%d, table id: %s", pSql, 1, pTableMetaInfo->name);
-  } else {  // query on super table
+  } else {  // query super table
     if (pTableMetaInfo->vnodeIndex < 0) {
       tscError("%p error vnodeIdx:%d", pSql, pTableMetaInfo->vnodeIndex);
       return -1;
     }
     
-    uint32_t vnodeId = 1;
+    pSql->ipList.numOfIps = taosArrayGetSize(pTableMetaInfo->vgroupIdList);
+    pSql->ipList.port     = tsDnodeShellPort;
+    pSql->ipList.inUse    = 0;
+    
+    for(int32_t i = 0; i < pSql->ipList.numOfIps; ++i) {
+      pSql->ipList.ip[i] = *(uint32_t*) taosArrayGet(pTableMetaInfo->vgroupIdList, i);
+    }
     
 #if 0
     SVnodeSidList *pVnodeSidList = tscGetVnodeSidList(pMetricMeta, pTableMetaInfo->vnodeIndex);
@@ -666,12 +679,13 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
     }
 #endif
     
+    uint32_t vnodeId = 1;
     tscTrace("%p query on vid:%d, number of tables:%d", pSql, vnodeId, numOfTables);
     pQueryMsg->head.vgId = htonl(vnodeId);
     numOfTables = 1;
   }
 
-  if (pQueryInfo->order.order == TSQL_SO_ASC) {
+  if (pQueryInfo->order.order == TSDB_ORDER_ASC) {
     pQueryMsg->window.skey = htobe64(pQueryInfo->stime);
     pQueryMsg->window.ekey = htobe64(pQueryInfo->etime);
   } else {
@@ -761,14 +775,14 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
     }
 
     if (!tscValidateColumnId(pTableMetaInfo, pExpr->colInfo.colId)) {
-      /* column id is not valid according to the cached metermeta, the meter meta is expired */
+      /* column id is not valid according to the cached metermeta, the table meta is expired */
       tscError("%p table schema is not matched with parsed sql", pSql);
       return -1;
     }
 
-    pSqlFuncExpr->colInfo.colId  = htons(pExpr->colInfo.colId);
-    pSqlFuncExpr->colInfo.colIdx = htons(pExpr->colInfo.colIdx);
-    pSqlFuncExpr->colInfo.flag   = htons(pExpr->colInfo.flag);
+    pSqlFuncExpr->colInfo.colId    = htons(pExpr->colInfo.colId);
+    pSqlFuncExpr->colInfo.colIndex = htons(pExpr->colInfo.colIndex);
+    pSqlFuncExpr->colInfo.flag     = htons(pExpr->colInfo.flag);
 
     pSqlFuncExpr->functionId  = htons(pExpr->functionId);
     pSqlFuncExpr->numOfParams = htons(pExpr->numOfParams);
@@ -816,16 +830,13 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
     pQueryMsg->orderType = htons(pGroupbyExpr->orderType);
 
     for (int32_t j = 0; j < pGroupbyExpr->numOfGroupCols; ++j) {
-      SColIndexEx *pCol = &pGroupbyExpr->columnInfo[j];
+      SColIndex *pCol = &pGroupbyExpr->columnInfo[j];
 
       *((int16_t *)pMsg) = pCol->colId;
       pMsg += sizeof(pCol->colId);
 
-      *((int16_t *)pMsg) += pCol->colIdx;
-      pMsg += sizeof(pCol->colIdx);
-
-      *((int16_t *)pMsg) += pCol->colIdxInBuf;
-      pMsg += sizeof(pCol->colIdxInBuf);
+      *((int16_t *)pMsg) += pCol->colIndex;
+      pMsg += sizeof(pCol->colIndex);
 
       *((int16_t *)pMsg) += pCol->flag;
       pMsg += sizeof(pCol->flag);
@@ -867,34 +878,19 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
   }
 
   // serialize tag column query condition
-  if (pQueryInfo->tagCond.numOfTagCond > 0) {
+  if (pQueryInfo->tagCond.pCond != NULL && taosArrayGetSize(pQueryInfo->tagCond.pCond) > 0) {
     STagCond* pTagCond = &pQueryInfo->tagCond;
     
-    SCond *pCond = tsGetSTableQueryCondPos(pTagCond, pTableMeta->uid);
+    SCond *pCond = tsGetSTableQueryCond(pTagCond, pTableMeta->uid);
     if (pCond != NULL && pCond->cond != NULL) {
-      size_t condLen = strlen(pCond->cond) + 1;
+      pQueryMsg->tagCondLen = htons(pCond->len);
+      memcpy(pMsg, pCond->cond, pCond->len);
       
-      bool ret = taosMbsToUcs4(pCond->cond, condLen, pMsg, condLen * TSDB_NCHAR_SIZE);
-      if (!ret) {
-        tscError("%p mbs to ucs4 failed:%d", pSql, tsGetSTableQueryCondPos(pTagCond, pTableMeta->uid));
-        return 0;
-      }
-      
-      pQueryMsg->tagCondLen = htons(condLen);
-      pMsg += condLen * TSDB_NCHAR_SIZE;
+      pMsg += pCond->len;
     }
   }
   
   // tbname in/like query expression should be sent to mgmt node
-  STagCond* pTagCond = &pQueryInfo->tagCond;
-  if (pTagCond->tbnameCond.cond != NULL) {
-    size_t s = strlen(pTagCond->tbnameCond.cond);
-    memcpy(pMsg, pTagCond->tbnameCond.cond, s);
-  
-    pQueryMsg->nameCondLen = htons(s);
-    pMsg += s;
-  }
-  
   msgLen = pMsg - pStart;
 
   tscTrace("%p msg built success,len:%d bytes", pSql, msgLen);
@@ -1547,7 +1543,7 @@ int tscBuildTableMetaMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
 }
 
 /**
- *  multi meter meta req pkg format:
+ *  multi table meta req pkg format:
  *  | SMgmtHead | SCMMultiTableInfoMsg | tableId0 | tableId1 | tableId2 | ......
  *      no used         4B
  **/
@@ -1592,8 +1588,10 @@ static UNUSED_FUNC int32_t tscEstimateMetricMetaMsgSize(SSqlCmd *pCmd) {
   SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(pCmd, 0);
 
   int32_t n = 0;
-  for (int32_t i = 0; i < pQueryInfo->tagCond.numOfTagCond; ++i) {
-    n += strlen(pQueryInfo->tagCond.cond[i].cond);
+  size_t size = taosArrayGetSize(pQueryInfo->tagCond.pCond);
+  for (int32_t i = 0; i < size; ++i) {
+    assert(0);
+//    n += strlen(pQueryInfo->tagCond.cond[i].cond);
   }
 
   int32_t tagLen = n * TSDB_NCHAR_SIZE;
@@ -1604,7 +1602,7 @@ static UNUSED_FUNC int32_t tscEstimateMetricMetaMsgSize(SSqlCmd *pCmd) {
   int32_t joinCondLen = (TSDB_TABLE_ID_LEN + sizeof(int16_t)) * 2;
   int32_t elemSize = sizeof(SSuperTableMetaElemMsg) * pQueryInfo->numOfTables;
   
-  int32_t colSize = pQueryInfo->groupbyExpr.numOfGroupCols*sizeof(SColIndexEx);
+  int32_t colSize = pQueryInfo->groupbyExpr.numOfGroupCols*sizeof(SColIndex);
 
   int32_t len = tagLen + joinCondLen + elemSize + colSize + defaultSize;
 
@@ -1676,13 +1674,13 @@ int tscBuildSTableVgroupMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
     // convert to unicode before sending to mnode for metric query
     int32_t condLen = 0;
     if (pTagCond->numOfTagCond > 0) {
-      SCond *pCond = tsGetSTableQueryCondPos(pTagCond, uid);
+      SCond *pCond = tsGetSTableQueryCond(pTagCond, uid);
       if (pCond != NULL && pCond->cond != NULL) {
         condLen = strlen(pCond->cond) + 1;
 
         bool ret = taosMbsToUcs4(pCond->cond, condLen, pMsg, condLen * TSDB_NCHAR_SIZE);
         if (!ret) {
-          tscError("%p mbs to ucs4 failed:%s", pSql, tsGetSTableQueryCondPos(pTagCond, uid));
+          tscError("%p mbs to ucs4 failed:%s", pSql, tsGetSTableQueryCond(pTagCond, uid));
           return 0;
         }
       }
@@ -1729,16 +1727,16 @@ int tscBuildSTableVgroupMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
 
         pElem->groupbyTagColumnList = htonl(offset);
         for (int32_t j = 0; j < pQueryInfo->groupbyExpr.numOfGroupCols; ++j) {
-          SColIndexEx *pCol = &pQueryInfo->groupbyExpr.columnInfo[j];
-          SColIndexEx *pDestCol = (SColIndexEx *)pMsg;
+          SColIndex *pCol = &pQueryInfo->groupbyExpr.columnInfo[j];
+          SColIndex *pDestCol = (SColIndex *)pMsg;
 
           pDestCol->colIdxInBuf = 0;
-          pDestCol->colIdx = htons(pCol->colIdx);
+          pDestCol->colIndex = htons(pCol->colIndex);
           pDestCol->colId = htons(pDestCol->colId);
           pDestCol->flag = htons(pDestCol->flag);
           strncpy(pDestCol->name, pCol->name, tListLen(pCol->name));
 
-          pMsg += sizeof(SColIndexEx);
+          pMsg += sizeof(SColIndex);
         }
       }
     }
@@ -1899,7 +1897,7 @@ int tscProcessTableMetaRsp(SSqlObj *pSql) {
 }
 
 /**
- *  multi meter meta rsp pkg format:
+ *  multi table meta rsp pkg format:
  *  | STaosRsp | ieType | SCMMultiTableInfoMsg | SMeterMeta0 | SSchema0 | SMeterMeta1 | SSchema1 | SMeterMeta2 | SSchema2
  *  |...... 1B        1B            4B
  **/
@@ -2131,7 +2129,8 @@ _error_clean:
   
   // todo opt performance
   for(int32_t i = 0; i < pStableVgroup->numOfDnodes; ++i) {
-    taosArrayPush(pInfo->vgroupIdList, &pStableVgroup->dnodeIps[i]);
+    int32_t ip = htonl(pStableVgroup->dnodeIps[i]);
+    taosArrayPush(pInfo->vgroupIdList, &ip);
   }
   
   return pSql->res.code;
@@ -2369,7 +2368,7 @@ void tscTableMetaCallBack(void *param, TAOS_RES *res, int code);
 static int32_t getTableMetaFromMgmt(SSqlObj *pSql, STableMetaInfo *pTableMetaInfo) {
   SSqlObj *pNew = calloc(1, sizeof(SSqlObj));
   if (NULL == pNew) {
-    tscError("%p malloc failed for new sqlobj to get meter meta", pSql);
+    tscError("%p malloc failed for new sqlobj to get table meta", pSql);
     return TSDB_CODE_CLI_OUT_OF_MEMORY;
   }
 
@@ -2384,7 +2383,7 @@ static int32_t getTableMetaFromMgmt(SSqlObj *pSql, STableMetaInfo *pTableMetaInf
 
   pNew->cmd.autoCreated = pSql->cmd.autoCreated;  // create table if not exists
   if (TSDB_CODE_SUCCESS != tscAllocPayload(&pNew->cmd, TSDB_DEFAULT_PAYLOAD_SIZE)) {
-    tscError("%p malloc failed for payload to get meter meta", pSql);
+    tscError("%p malloc failed for payload to get table meta", pSql);
     free(pNew);
 
     return TSDB_CODE_CLI_OUT_OF_MEMORY;
@@ -2466,9 +2465,10 @@ int tscRenewMeterMeta(SSqlObj *pSql, char *tableId) {
    * 2. if get metermeta failed, still get the metermeta
    */
   if (pTableMetaInfo->pTableMeta == NULL || !tscQueryOnMetric(pCmd)) {
+    STableMeta* pTableMeta = pTableMetaInfo->pTableMeta;
     if (pTableMetaInfo->pTableMeta) {
-      tscTrace("%p update meter meta, old: numOfTags:%d, numOfCols:%d, uid:%" PRId64 ", addr:%p", pSql,
-               pTableMetaInfo->numOfTags, pCmd->numOfCols, pTableMetaInfo->pTableMeta->uid, pTableMetaInfo->pTableMeta);
+      tscTrace("%p update table meta, old: numOfTags:%d, numOfCols:%d, uid:%" PRId64 ", addr:%p", pSql,
+               tscGetNumOfTags(pTableMeta), tscGetNumOfColumns(pTableMeta), pTableMeta->uid, pTableMeta);
     }
 
     tscWaitingForCreateTable(pCmd);
@@ -2497,7 +2497,6 @@ int tscGetSTableVgroupInfo(SSqlObj *pSql, int32_t clauseIndex) {
   }
   
 #if 0
-  
   for (int32_t i = 0; i < pQueryInfo->numOfTables; ++i) {
     char tagstr[TSDB_MAX_TAGS_LEN + 1] = {0};
 
@@ -2536,7 +2535,7 @@ int tscGetSTableVgroupInfo(SSqlObj *pSql, int32_t clauseIndex) {
     STableMetaInfo *pMMInfo = tscGetMetaInfo(pQueryInfo, i);
 
     STableMeta *pTableMeta = taosCacheAcquireByName(tscCacheHandle, pMMInfo->name);
-    tscAddMeterMetaInfo(pNewQueryInfo, pMMInfo->name, pTableMeta, NULL, pMMInfo->numOfTags, pMMInfo->tagColumnIndex);
+    tscAddTableMetaInfo(pNewQueryInfo, pMMInfo->name, pTableMeta, NULL, pMMInfo->numOfTags, pMMInfo->tagColumnIndex);
   }
 
   if ((code = tscAllocPayload(&pNew->cmd, TSDB_DEFAULT_PAYLOAD_SIZE)) != TSDB_CODE_SUCCESS) {
diff --git a/src/client/src/tscSql.c b/src/client/src/tscSql.c
index f2a3cdcab049621b1612dea3e172aac2ffca2831..c522dbfebe9365e51c8ef8aa20e2d6243401fee4 100644
--- a/src/client/src/tscSql.c
+++ b/src/client/src/tscSql.c
@@ -417,7 +417,7 @@ int taos_fetch_block_impl(TAOS_RES *res, TAOS_ROW *rows) {
 
   *rows = pRes->tsrow;
 
-  return (pQueryInfo->order.order == TSQL_SO_DESC) ? pRes->numOfRows : -pRes->numOfRows;
+  return (pQueryInfo->order.order == TSDB_ORDER_DESC) ? pRes->numOfRows : -pRes->numOfRows;
 }
 
 static void transferNcharData(SSqlObj *pSql, int32_t columnIndex, TAOS_FIELD *pField) {
@@ -512,14 +512,14 @@ static void **doSetResultRowData(SSqlObj *pSql) {
       }
       
       for(int32_t k = 0; k < sas->numOfCols; ++k) {
-        int32_t columnIndex = sas->pExpr->binExprInfo.pReqColumns[k].colIdxInBuf;
+        int32_t columnIndex = sas->pExpr->binExprInfo.pReqColumns[k].colIndex;
         SSqlExpr* pExpr = tscSqlExprGet(pQueryInfo, columnIndex);
         
         sas->elemSize[k] = pExpr->resBytes;
         sas->data[k] = (pRes->data + pRes->numOfRows* pExpr->offset) + pRes->row*pExpr->resBytes;
       }
 
-      tSQLBinaryExprCalcTraverse(sas->pExpr->binExprInfo.pBinExpr, 1, pRes->buffer[i], sas, TSQL_SO_ASC, getArithemicInputSrc);
+      tSQLBinaryExprCalcTraverse(sas->pExpr->binExprInfo.pBinExpr, 1, pRes->buffer[i], sas, TSDB_ORDER_ASC, getArithemicInputSrc);
       pRes->tsrow[i] = pRes->buffer[i];
       
       free(sas); //todo optimization
diff --git a/src/client/src/tscSubquery.c b/src/client/src/tscSubquery.c
index 3660c822d717569abe7964751ab2df73fa728c6a..0589a6359bde43ac73bc62f27217bc7a63683d5c 100644
--- a/src/client/src/tscSubquery.c
+++ b/src/client/src/tscSubquery.c
@@ -26,7 +26,7 @@ typedef struct SInsertSupporter {
 static void freeSubqueryObj(SSqlObj* pSql);
 
 static bool doCompare(int32_t order, int64_t left, int64_t right) {
-  if (order == TSQL_SO_ASC) {
+  if (order == TSDB_ORDER_ASC) {
     return left < right;
   } else {
     return left > right;
@@ -136,8 +136,8 @@ static int64_t doTSBlockIntersect(SSqlObj* pSql, SJoinSubquerySupporter* pSuppor
    * 2. only one element for each tag.
    */
   if (output1->tsOrder == -1) {
-    output1->tsOrder = TSQL_SO_ASC;
-    output2->tsOrder = TSQL_SO_ASC;
+    output1->tsOrder = TSDB_ORDER_ASC;
+    output2->tsOrder = TSDB_ORDER_ASC;
   }
 
   tsBufFlush(output1);
@@ -1005,8 +1005,8 @@ int32_t tscHandleMasterSTableQuery(SSqlObj *pSql) {
   SQueryInfo *    pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);
   STableMetaInfo *pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
   
-  int32_t numOfSubQueries = taosArrayGetSize(pTableMetaInfo->vgroupIdList);
-  assert(numOfSubQueries > 0);
+  pSql->numOfSubs = taosArrayGetSize(pTableMetaInfo->vgroupIdList);
+  assert(pSql->numOfSubs > 0);
   
   int32_t ret = tscLocalReducerEnvCreate(pSql, &pMemoryBuf, &pDesc, &pModel, nBufferSize);
   if (ret != 0) {
@@ -1017,16 +1017,15 @@ int32_t tscHandleMasterSTableQuery(SSqlObj *pSql) {
     return pRes->code;
   }
   
-  pSql->pSubs = calloc(numOfSubQueries, POINTER_BYTES);
-  pSql->numOfSubs = numOfSubQueries;
+  pSql->pSubs = calloc(pSql->numOfSubs, POINTER_BYTES);
   
-  tscTrace("%p retrieved query data from %d vnode(s)", pSql, numOfSubQueries);
+  tscTrace("%p retrieved query data from %d vnode(s)", pSql, pSql->numOfSubs);
   SSubqueryState *pState = calloc(1, sizeof(SSubqueryState));
-  pState->numOfTotal = numOfSubQueries;
+  pState->numOfTotal = pSql->numOfSubs;
   pRes->code = TSDB_CODE_SUCCESS;
   
   int32_t i = 0;
-  for (; i < numOfSubQueries; ++i) {
+  for (; i < pSql->numOfSubs; ++i) {
     SRetrieveSupport *trs = (SRetrieveSupport *)calloc(1, sizeof(SRetrieveSupport));
     if (trs == NULL) {
       tscError("%p failed to malloc buffer for SRetrieveSupport, orderOfSub:%d, reason:%s", pSql, i, strerror(errno));
@@ -1070,22 +1069,22 @@ int32_t tscHandleMasterSTableQuery(SSqlObj *pSql) {
     tscTrace("%p sub:%p create subquery success. orderOfSub:%d", pSql, pNew, trs->subqueryIndex);
   }
   
-  if (i < numOfSubQueries) {
+  if (i < pSql->numOfSubs) {
     tscError("%p failed to prepare subquery structure and launch subqueries", pSql);
     pRes->code = TSDB_CODE_CLI_OUT_OF_MEMORY;
     
-    tscLocalReducerEnvDestroy(pMemoryBuf, pDesc, pModel, numOfSubQueries);
+    tscLocalReducerEnvDestroy(pMemoryBuf, pDesc, pModel, pSql->numOfSubs);
     doCleanupSubqueries(pSql, i, pState);
     return pRes->code;   // free all allocated resource
   }
   
   if (pRes->code == TSDB_CODE_QUERY_CANCELLED) {
-    tscLocalReducerEnvDestroy(pMemoryBuf, pDesc, pModel, numOfSubQueries);
+    tscLocalReducerEnvDestroy(pMemoryBuf, pDesc, pModel, pSql->numOfSubs);
     doCleanupSubqueries(pSql, i, pState);
     return pRes->code;
   }
   
-  for(int32_t j = 0; j < numOfSubQueries; ++j) {
+  for(int32_t j = 0; j < pSql->numOfSubs; ++j) {
     SSqlObj* pSub = pSql->pSubs[j];
     SRetrieveSupport* pSupport = pSub->param;
     
@@ -1450,7 +1449,7 @@ void tscRetrieveDataRes(void *param, TAOS_RES *tres, int code) {
       tscTrace("%p sub:%p reach the max retry count,set global code:%d", pParentSql, pSql, code);
       atomic_val_compare_exchange_32(&pState->code, 0, code);
     } else {  // does not reach the maximum retry count, go on
-      tscTrace("%p sub:%p failed code:%d, retry:%d", pParentSql, pSql, code, trsupport->numOfRetry);
+      tscTrace("%p sub:%p failed code:%s, retry:%d", pParentSql, pSql, tstrerror(code), trsupport->numOfRetry);
       
       SSqlObj *pNew = tscCreateSqlObjForSubquery(pParentSql, trsupport, pSql);
       if (pNew == NULL) {
diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index dd0945ab0494c99ff9a01af97614291ea8084a7c..2385b4ad823513e536ce26ce7d98fa14db657246 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -53,7 +53,7 @@ void tscGetMetricMetaCacheKey(SQueryInfo* pQueryInfo, char* str, uint64_t uid) {
 
   const int32_t maxKeySize = TSDB_MAX_TAGS_LEN;  // allowed max key size
 
-  SCond* cond = tsGetSTableQueryCondPos(pTagCond, uid);
+  SCond* cond = tsGetSTableQueryCond(pTagCond, uid);
 
   char join[512] = {0};
   if (pTagCond->joinInfo.hasJoin) {
@@ -92,28 +92,41 @@ void tscGetMetricMetaCacheKey(SQueryInfo* pQueryInfo, char* str, uint64_t uid) {
   free(tmp);
 }
 
-SCond* tsGetSTableQueryCondPos(STagCond* pTagCond, uint64_t uid) {
-  for (int32_t i = 0; i < TSDB_MAX_JOIN_TABLE_NUM; ++i) {
-    if (uid == pTagCond->cond[i].uid) {
-      return &pTagCond->cond[i];
+SCond* tsGetSTableQueryCond(STagCond* pTagCond, uint64_t uid) {
+  if (pTagCond->pCond == NULL) {
+    return NULL;
+  }
+  
+  size_t size = taosArrayGetSize(pTagCond->pCond);
+  for (int32_t i = 0; i < size; ++i) {
+    SCond* pCond = taosArrayGet(pTagCond->pCond, i);
+    
+    if (uid == pCond->uid) {
+      return pCond;
     }
   }
 
   return NULL;
 }
 
-// todo refactor by using SArray
-void tsSetSTableQueryCond(STagCond* pTagCond, uint64_t uid, const char* str) {
-  size_t len = strlen(str);
-  if (len == 0) {
+void tsSetSTableQueryCond(STagCond* pTagCond, uint64_t uid, SBuffer* pBuf) {
+  if (tbufTell(pBuf) == 0) {
     return;
   }
-
-  SCond* pDest = &pTagCond->cond[pTagCond->numOfTagCond];
-  pDest->uid = uid;
-  pDest->cond = strdup(str);
-
-  pTagCond->numOfTagCond += 1;
+  
+  SCond cond = {
+    .uid = uid,
+    .len = tbufTell(pBuf),
+    .cond = NULL,
+  };
+  
+  cond.cond = tbufGetData(pBuf, true);
+  
+  if (pTagCond->pCond == NULL) {
+    pTagCond->pCond = taosArrayInit(3, sizeof(SCond));
+  }
+  
+  taosArrayPush(pTagCond->pCond, &cond);
 }
 
 bool tscQueryOnMetric(SSqlCmd* pCmd) {
@@ -1185,7 +1198,7 @@ SSqlExpr* tscSqlExprInsert(SQueryInfo* pQueryInfo, int32_t index, int16_t functi
     }
   }
 
-  pExpr->colInfo.colIdx = pColIndex->columnIndex;
+  pExpr->colInfo.colIndex = pColIndex->columnIndex;
   pExpr->resType = type;
   pExpr->resBytes = size;
   pExpr->interResBytes = interSize;
@@ -1207,7 +1220,7 @@ SSqlExpr* tscSqlExprUpdate(SQueryInfo* pQueryInfo, int32_t index, int16_t functi
 
   pExpr->functionId = functionId;
 
-  pExpr->colInfo.colIdx = srcColumnIndex;
+  pExpr->colInfo.colIndex = srcColumnIndex;
   pExpr->colInfo.colId = tscGetTableColumnSchema(pTableMetaInfo->pTableMeta, srcColumnIndex)->colId;
 
   pExpr->resType = type;
@@ -1642,26 +1655,46 @@ void tscTagCondCopy(STagCond* dest, const STagCond* src) {
   dest->tbnameCond.uid = src->tbnameCond.uid;
 
   memcpy(&dest->joinInfo, &src->joinInfo, sizeof(SJoinInfo));
-
-  for (int32_t i = 0; i < src->numOfTagCond; ++i) {
-    if (src->cond[i].cond != NULL) {
-      dest->cond[i].cond = strdup(src->cond[i].cond);
+  dest->relType = src->relType;
+  
+  if (src->pCond == NULL) {
+    return;
+  }
+  
+  size_t s = taosArrayGetSize(src->pCond);
+  dest->pCond = taosArrayInit(s, sizeof(SCond));
+  
+  for (int32_t i = 0; i < s; ++i) {
+    SCond* pCond = taosArrayGet(src->pCond, i);
+    
+    SCond c = {0};
+    c.len = pCond->len;
+    c.uid = pCond->uid;
+    
+    if (pCond->len > 0) {
+      assert(pCond->cond != NULL);
+      c.cond = malloc(c.len);
+      memcpy(c.cond, pCond->cond, c.len);
     }
-
-    dest->cond[i].uid = src->cond[i].uid;
+    
+    taosArrayPush(dest->pCond, &c);
   }
-
-  dest->relType = src->relType;
-  dest->numOfTagCond = src->numOfTagCond;
 }
 
-void tscTagCondRelease(STagCond* pCond) {
-  free(pCond->tbnameCond.cond);
-  for (int32_t i = 0; i < pCond->numOfTagCond; ++i) {
-    free(pCond->cond[i].cond);
+void tscTagCondRelease(STagCond* pTagCond) {
+  free(pTagCond->tbnameCond.cond);
+  
+  if (pTagCond->pCond != NULL) {
+    size_t s = taosArrayGetSize(pTagCond->pCond);
+    for (int32_t i = 0; i < s; ++i) {
+      SCond* p = taosArrayGet(pTagCond->pCond, i);
+      tfree(p->cond);
+    }
+  
+    taosArrayDestroy(pTagCond->pCond);
   }
 
-  memset(pCond, 0, sizeof(STagCond));
+  memset(pTagCond, 0, sizeof(STagCond));
 }
 
 void tscGetSrcColumnInfo(SSrcColumnInfo* pColInfo, SQueryInfo* pQueryInfo) {
@@ -1674,11 +1707,11 @@ void tscGetSrcColumnInfo(SSrcColumnInfo* pColInfo, SQueryInfo* pQueryInfo) {
 
     if (TSDB_COL_IS_TAG(pExpr->colInfo.flag)) {
       SSchema* pTagSchema = tscGetTableTagSchema(pTableMetaInfo->pTableMeta);
-      int16_t  actualTagIndex = pTableMetaInfo->tagColumnIndex[pExpr->colInfo.colIdx];
+      int16_t  actualTagIndex = pTableMetaInfo->tagColumnIndex[pExpr->colInfo.colIndex];
 
       pColInfo[i].type = (actualTagIndex != -1) ? pTagSchema[actualTagIndex].type : TSDB_DATA_TYPE_BINARY;
     } else {
-      pColInfo[i].type = pSchema[pExpr->colInfo.colIdx].type;
+      pColInfo[i].type = pSchema[pExpr->colInfo.colIndex].type;
     }
   }
 }
@@ -1880,8 +1913,8 @@ void tscFreeSubqueryInfo(SSqlCmd* pCmd) {
   tfree(pCmd->pQueryInfo);
 }
 
-STableMetaInfo* tscAddMeterMetaInfo(SQueryInfo* pQueryInfo, const char* name, STableMeta* pTableMeta,
-                                    SSuperTableMeta* pMetricMeta, int16_t numOfTags, int16_t* tags) {
+STableMetaInfo* tscAddTableMetaInfo(SQueryInfo* pQueryInfo, const char* name, STableMeta* pTableMeta,
+                                    SArray* vgroupList, int16_t numOfTags, int16_t* tags) {
   void* pAlloc = realloc(pQueryInfo->pTableMetaInfo, (pQueryInfo->numOfTables + 1) * POINTER_BYTES);
   if (pAlloc == NULL) {
     return NULL;
@@ -1900,6 +1933,10 @@ STableMetaInfo* tscAddMeterMetaInfo(SQueryInfo* pQueryInfo, const char* name, ST
 
   pTableMetaInfo->pTableMeta = pTableMeta;
   pTableMetaInfo->numOfTags = numOfTags;
+  
+  if (vgroupList != NULL) {
+    pTableMetaInfo->vgroupIdList = taosArrayClone(vgroupList);
+  }
 
   if (tags != NULL) {
     memcpy(pTableMetaInfo->tagColumnIndex, tags, sizeof(pTableMetaInfo->tagColumnIndex[0]) * numOfTags);
@@ -1910,7 +1947,7 @@ STableMetaInfo* tscAddMeterMetaInfo(SQueryInfo* pQueryInfo, const char* name, ST
 }
 
 STableMetaInfo* tscAddEmptyMetaInfo(SQueryInfo* pQueryInfo) {
-  return tscAddMeterMetaInfo(pQueryInfo, NULL, NULL, NULL, 0, NULL);
+  return tscAddTableMetaInfo(pQueryInfo, NULL, NULL, NULL, 0, NULL);
 }
 
 void doRemoveMeterMetaInfo(SQueryInfo* pQueryInfo, int32_t index, bool removeFromCache) {
@@ -1961,14 +1998,14 @@ void tscResetForNextRetrieve(SSqlRes* pRes) {
 }
 
 SSqlObj* createSubqueryObj(SSqlObj* pSql, int16_t tableIndex, void (*fp)(), void* param, int32_t cmd, SSqlObj* pPrevSql) {
-  SSqlCmd*        pCmd = &pSql->cmd;
-  STableMetaInfo* pTableMetaInfo = tscGetTableMetaInfoFromCmd(pCmd, pCmd->clauseIndex, tableIndex);
-
+  SSqlCmd* pCmd = &pSql->cmd;
   SSqlObj* pNew = (SSqlObj*)calloc(1, sizeof(SSqlObj));
   if (pNew == NULL) {
-    tscError("%p new subquery failed, tableIndex:%d, vnodeIndex:%d", pSql, tableIndex, pTableMetaInfo->vnodeIndex);
+    tscError("%p new subquery failed, tableIndex:%d", pSql, tableIndex);
     return NULL;
   }
+  
+  STableMetaInfo* pTableMetaInfo = tscGetTableMetaInfoFromCmd(pCmd, pCmd->clauseIndex, tableIndex);
 
   pNew->pTscObj = pSql->pTscObj;
   pNew->signature = pNew;
@@ -2084,12 +2121,12 @@ SSqlObj* createSubqueryObj(SSqlObj* pSql, int16_t tableIndex, void (*fp)(), void
   if (pPrevSql == NULL) {
     STableMeta* pTableMeta = taosCacheAcquireByName(tscCacheHandle, name);
     
-    SSuperTableMeta* pMetricMeta = NULL;
-    if (cmd == TSDB_SQL_SELECT) {
-      pMetricMeta = taosCacheAcquireByName(tscCacheHandle, key);
-    }
+//    SSuperTableMeta* pMetricMeta = NULL;
+//    if (cmd == TSDB_SQL_SELECT) {
+//      pMetricMeta = taosCacheAcquireByName(tscCacheHandle, key);
+//    }
 
-    pFinalInfo = tscAddMeterMetaInfo(pNewQueryInfo, name, pTableMeta, pMetricMeta, pTableMetaInfo->numOfTags,
+    pFinalInfo = tscAddTableMetaInfo(pNewQueryInfo, name, pTableMeta, pTableMetaInfo->vgroupIdList, pTableMetaInfo->numOfTags,
                                      pTableMetaInfo->tagColumnIndex);
   } else {  // transfer the ownership of pTableMeta/pMetricMeta to the newly create sql object.
 //    STableMetaInfo* pPrevInfo = tscGetTableMetaInfoFromCmd(&pPrevSql->cmd, pPrevSql->cmd.clauseIndex, 0);
@@ -2097,7 +2134,7 @@ SSqlObj* createSubqueryObj(SSqlObj* pSql, int16_t tableIndex, void (*fp)(), void
 //    STableMeta*  pPrevMeterMeta = taosCacheTransfer(tscCacheHandle, (void**)&pPrevInfo->pTableMeta);
 //    SSuperTableMeta* pPrevMetricMeta = taosCacheTransfer(tscCacheHandle, (void**)&pPrevInfo->pMetricMeta);
 
-//    pFinalInfo = tscAddMeterMetaInfo(pNewQueryInfo, name, pPrevMeterMeta, pPrevMetricMeta, pTableMetaInfo->numOfTags,
+//    pFinalInfo = tscAddTableMetaInfo(pNewQueryInfo, name, pPrevMeterMeta, pPrevMetricMeta, pTableMetaInfo->numOfTags,
 //                                     pTableMetaInfo->tagColumnIndex);
   }
 
diff --git a/src/dnode/src/dnodeWrite.c b/src/dnode/src/dnodeWrite.c
index 2e0ec5f95b1f00ae5ba60b978e7b00136bbf8efd..3c598ca360db70080e76e82ca7a8ec7f3bc6ce48 100644
--- a/src/dnode/src/dnodeWrite.c
+++ b/src/dnode/src/dnodeWrite.c
@@ -218,7 +218,7 @@ static void dnodeHandleIdleWorker(SWriteWorker *pWorker) {
   int32_t num = taosGetQueueNumber(pWorker->qset);
 
   if (num > 0) {
-     usleep(100);
+     usleep(1000);
      sched_yield(); 
   } else {
      taosCloseQset(pWorker->qset);
diff --git a/src/inc/taosdef.h b/src/inc/taosdef.h
index d6a9447e3d192120a2712b46d1b2310c2732344f..de5aa1dc12725cbe1f75ee9de958586e57dd7473 100644
--- a/src/inc/taosdef.h
+++ b/src/inc/taosdef.h
@@ -147,10 +147,10 @@ void tsDataSwap(void *pLeft, void *pRight, int32_t type, int32_t size);
 // TODO: check if below is necessary
 #define TSDB_RELATION_INVALID     0
 #define TSDB_RELATION_LESS        1
-#define TSDB_RELATION_LARGE       2
+#define TSDB_RELATION_GREATER     2
 #define TSDB_RELATION_EQUAL       3
 #define TSDB_RELATION_LESS_EQUAL  4
-#define TSDB_RELATION_LARGE_EQUAL 5
+#define TSDB_RELATION_GREATER_EQUAL 5
 #define TSDB_RELATION_NOT_EQUAL   6
 #define TSDB_RELATION_LIKE        7
 
@@ -303,8 +303,8 @@ void tsDataSwap(void *pLeft, void *pRight, int32_t type, int32_t size);
 #define TSDB_QUERY_SET_TYPE(x, _type)         ((x) |= (_type))
 #define TSDB_QUERY_RESET_TYPE(x)              ((x) = TSDB_QUERY_TYPE_NON_TYPE)
 
-#define TSQL_SO_ASC   1
-#define TSQL_SO_DESC  0
+#define TSDB_ORDER_ASC   1
+#define TSDB_ORDER_DESC  2
 
 #define TSDB_SESSIONS_PER_VNODE (300)
 #define TSDB_SESSIONS_PER_DNODE (TSDB_SESSIONS_PER_VNODE * TSDB_MAX_VNODES)
diff --git a/src/inc/taosmsg.h b/src/inc/taosmsg.h
index f5168a2c9eecb842a5b7e28003444cb12f7f4f32..c580bdecdc687957544bb5510a5fc37d4de577b9 100644
--- a/src/inc/taosmsg.h
+++ b/src/inc/taosmsg.h
@@ -358,7 +358,7 @@ typedef struct {
   int32_t vgId;
 } SMDDropVnodeMsg;
 
-typedef struct SColIndexEx {
+typedef struct SColIndex {
   int16_t colId;
   /*
    * colIdx is the index of column in latest schema of table
@@ -368,11 +368,10 @@ typedef struct SColIndexEx {
    * colIdxInBuf is used to denote the index of column in pQuery->colList,
    * this value is invalid in client side, as well as in cache block of vnode either.
    */
-  int16_t  colIdx;
-  int16_t  colIdxInBuf;
+  int16_t  colIndex;
   uint16_t flag;  // denote if it is a tag or not
   char     name[TSDB_COL_NAME_LEN];
-} SColIndexEx;
+} SColIndex;
 
 /* sql function msg, to describe the message to vnode about sql function
  * operations in select clause */
@@ -380,7 +379,7 @@ typedef struct SSqlFuncExprMsg {
   int16_t functionId;
   int16_t numOfParams;
 
-  SColIndexEx colInfo;
+  SColIndex colInfo;
   struct ArgElem {
     int16_t argType;
     int16_t argBytes;
@@ -395,7 +394,7 @@ typedef struct SSqlFuncExprMsg {
 typedef struct SSqlBinaryExprInfo {
   struct tExprNode *pBinExpr;    /*  for binary expression */
   int32_t           numOfCols;   /*  binary expression involves the readed number of columns*/
-  SColIndexEx *     pReqColumns; /*  source column list */
+  SColIndex *     pReqColumns;   /*  source column list */
 } SSqlBinaryExprInfo;
 
 typedef struct SSqlFunctionExpr {
@@ -467,7 +466,6 @@ typedef struct {
   int64_t     slidingTime;      // value for sliding window
   char        slidingTimeUnit;  // time interval type, for revisement of interval(1d)
   uint16_t    tagCondLen;       // tag length in current query
-  uint16_t    nameCondLen;      // table name in/like query expression string length
   int16_t     numOfGroupCols;   // num of group by columns
   int16_t     orderByIdx;
   int16_t     orderType;        // used in group by xx order by xxx
@@ -669,7 +667,7 @@ typedef struct {
 typedef struct STableMetaMsg {
   int32_t    contLen;
   
-  char       tableId[TSDB_TABLE_ID_LEN];       // table id
+  char       tableId[TSDB_TABLE_ID_LEN];   // table id
   char       stableId[TSDB_TABLE_ID_LEN];  // stable name if it is created according to super table
   uint8_t    numOfTags;
   uint8_t    precision;
diff --git a/src/query/inc/qast.h b/src/query/inc/qast.h
index 616a2a46afb28506d639a6ea250147fc8bbcfc08..72d6f9bf47475dbf454ed8c4eaae557f5dcb3522 100644
--- a/src/query/inc/qast.h
+++ b/src/query/inc/qast.h
@@ -48,7 +48,7 @@ typedef void (*__do_filter_suppl_fn_t)(void *, void *);
  */
 typedef struct tQueryInfo {
   int32_t       offset;   // offset value in tags
-  int32_t       colIdx;   // index of column in schema
+  int32_t       colIndex; // index of column in schema
   uint8_t       optr;     // expression operator
   SSchema       sch;      // schema of tags
   tVariant      q;        // query condition value on the specific schema, filter expression
@@ -83,7 +83,7 @@ void tSQLBinaryExprToString(tExprNode *pExpr, char *dst, int32_t *len);
 
 void tExprTreeDestroy(tExprNode **pExprs, void (*fp)(void*));
 
-void tSQLBinaryExprTraverse(tExprNode *pExpr, SSkipList *pSkipList, SArray *result, SBinaryFilterSupp *param);
+void tExprTreeTraverse(tExprNode *pExpr, SSkipList *pSkipList, SArray *result, SBinaryFilterSupp *param);
 
 void tSQLBinaryExprCalcTraverse(tExprNode *pExprs, int32_t numOfRows, char *pOutput, void *param, int32_t order,
                                 char *(*cb)(void *, char *, int32_t));
@@ -94,7 +94,7 @@ uint8_t getBinaryExprOptr(SSQLToken *pToken);
 
 SBuffer exprTreeToBinary(tExprNode* pExprTree);
 
-tExprNode* exprTreeFromBinary(const void* pBuf, size_t size);
+int32_t exprTreeFromBinary(const void* pBuf, size_t size, tExprNode** pExprNode);
 
 #ifdef __cplusplus
 }
diff --git a/src/query/inc/queryExecutor.h b/src/query/inc/queryExecutor.h
index 8c8c1a3a12f2392441abdd4ca673b45641cf1e22..dc5f2fcb78fba4d690ac4466643f4d2a9589021c 100644
--- a/src/query/inc/queryExecutor.h
+++ b/src/query/inc/queryExecutor.h
@@ -39,7 +39,7 @@ typedef int32_t (*__block_search_fn_t)(char* data, int32_t num, int64_t key, int
 typedef struct SSqlGroupbyExpr {
   int16_t     tableIndex;
   int16_t     numOfGroupCols;
-  SColIndexEx columnInfo[TSDB_MAX_TAGS];  // group by columns information
+  SColIndex columnInfo[TSDB_MAX_TAGS];  // group by columns information
   int16_t     orderIndex;                 // order by column index
   int16_t     orderType;                  // order by type: asc/desc
 } SSqlGroupbyExpr;
@@ -63,7 +63,7 @@ typedef struct SWindowResult {
 
 typedef struct SResultRec {
   int64_t total;     // total generated result size in rows
-  int64_t size;      // current result set size in rows
+  int64_t rows;      // current result set size in rows
   int64_t capacity;  // capacity of current result output buffer
   
   // result size threshold in rows. If the result buffer is larger than this, pause query and return to client
@@ -125,7 +125,7 @@ typedef struct SQuery {
   int8_t            precision;
   int16_t           numOfOutputCols;
   int16_t           interpoType;
-  int16_t           checkBufferInLoop;  // check if the buffer is full during scan each block
+  int16_t           checkBuffer;  // check if the buffer is full during scan each block
   SLimitVal         limit;
   int32_t           rowSize;
   SSqlGroupbyExpr*  pGroupbyExpr;
diff --git a/src/query/inc/sql.y b/src/query/inc/sql.y
index 585aa8a9cf8a5166e00ec23b9782bb979c671634..87b974b9bac00e392985e1f06744d5f52aab3f4e 100644
--- a/src/query/inc/sql.y
+++ b/src/query/inc/sql.y
@@ -466,9 +466,9 @@ item(A) ::= ids(X) cpxName(Y).   {
 }
 
 %type sortorder {int}
-sortorder(A) ::= ASC.           {A = TSQL_SO_ASC; }
-sortorder(A) ::= DESC.          {A = TSQL_SO_DESC;}
-sortorder(A) ::= .              {A = TSQL_SO_ASC;}  //default is descend order
+sortorder(A) ::= ASC.           {A = TSDB_ORDER_ASC; }
+sortorder(A) ::= DESC.          {A = TSDB_ORDER_DESC;}
+sortorder(A) ::= .              {A = TSDB_ORDER_ASC;}  //default is descend order
 
 //group by clause
 %type groupby_opt {tVariantList*}
diff --git a/src/query/inc/tsqlfunction.h b/src/query/inc/tsqlfunction.h
index c7aa57200cff7e7fb6091e55dd4366875f6e57b7..7514f1e44c48c973f55dda3c39b469d3a9c18c3b 100644
--- a/src/query/inc/tsqlfunction.h
+++ b/src/query/inc/tsqlfunction.h
@@ -102,7 +102,7 @@ extern "C" {
 #define QUERY_ASC_FORWARD_STEP 1
 #define QUERY_DESC_FORWARD_STEP -1
 
-#define GET_FORWARD_DIRECTION_FACTOR(ord) (((ord) == TSQL_SO_ASC) ? QUERY_ASC_FORWARD_STEP : QUERY_DESC_FORWARD_STEP)
+#define GET_FORWARD_DIRECTION_FACTOR(ord) (((ord) == TSDB_ORDER_ASC) ? QUERY_ASC_FORWARD_STEP : QUERY_DESC_FORWARD_STEP)
 
 #define MAX_RETRIEVE_ROWS_IN_INTERVAL_QUERY 10000000
 #define TOP_BOTTOM_QUERY_LIMIT 100
diff --git a/src/query/src/qast.c b/src/query/src/qast.c
index 6674dc1abafdae5b9ccd71df7395609a551ce6ef..ffc47d2abeb1cbd9fe05652563e653a61276cc6c 100644
--- a/src/query/src/qast.c
+++ b/src/query/src/qast.c
@@ -18,6 +18,7 @@
 #include "tutil.h"
 #include "tbuffer.h"
 #include "qast.h"
+#include "tcompare.h"
 #include "qsqlparser.h"
 #include "qsyntaxtreefunction.h"
 #include "taosdef.h"
@@ -79,22 +80,22 @@ static void reviseBinaryExprIfNecessary(tExprNode **pLeft, tExprNode **pRight, u
    * switch left and left and right hand side in expr if possible
    */
   if ((*pLeft)->nodeType == TSQL_NODE_VALUE && (*pRight)->nodeType == TSQL_NODE_COL) {
-    if (*optr >= TSDB_RELATION_LARGE && *optr <= TSDB_RELATION_LARGE_EQUAL && *optr != TSDB_RELATION_EQUAL) {
+    if (*optr >= TSDB_RELATION_GREATER && *optr <= TSDB_RELATION_GREATER_EQUAL && *optr != TSDB_RELATION_EQUAL) {
       SWAP(*pLeft, *pRight, tExprNode *);
     }
 
     switch (*optr) {
-      case TSDB_RELATION_LARGE:
+      case TSDB_RELATION_GREATER:
         (*optr) = TSDB_RELATION_LESS;
         break;
       case TSDB_RELATION_LESS:
-        (*optr) = TSDB_RELATION_LARGE;
+        (*optr) = TSDB_RELATION_GREATER;
         break;
-      case TSDB_RELATION_LARGE_EQUAL:
+      case TSDB_RELATION_GREATER_EQUAL:
         (*optr) = TSDB_RELATION_LESS_EQUAL;
         break;
       case TSDB_RELATION_LESS_EQUAL:
-        (*optr) = TSDB_RELATION_LARGE_EQUAL;
+        (*optr) = TSDB_RELATION_GREATER_EQUAL;
         break;
       default:;
         // for other type of operations, do nothing
@@ -163,9 +164,9 @@ uint8_t getBinaryExprOptr(SSQLToken *pToken) {
     case TK_LE:
       return TSDB_RELATION_LESS_EQUAL;
     case TK_GT:
-      return TSDB_RELATION_LARGE;
+      return TSDB_RELATION_GREATER;
     case TK_GE:
-      return TSDB_RELATION_LARGE_EQUAL;
+      return TSDB_RELATION_GREATER_EQUAL;
     case TK_NE:
       return TSDB_RELATION_NOT_EQUAL;
     case TK_AND:
@@ -376,12 +377,12 @@ static char *tSQLOptrToString(uint8_t optr, char *dst) {
       dst += 1;
       break;
     }
-    case TSDB_RELATION_LARGE: {
+    case TSDB_RELATION_GREATER: {
       *dst = '>';
       dst += 1;
       break;
     }
-    case TSDB_RELATION_LARGE_EQUAL: {
+    case TSDB_RELATION_GREATER_EQUAL: {
       *dst = '>';
       *(dst + 1) = '=';
       dst += 2;
@@ -466,8 +467,18 @@ void tExprTreeDestroy(tExprNode **pExpr, void (*fp)(void *)) {
   *pExpr = NULL;
 }
 
+typedef struct {
+  tVariant v;
+  int32_t  optr;
+} SEndPoint;
+
+typedef struct {
+  SEndPoint* start;
+  SEndPoint* end;
+} SQueryCond;
+
 //static void setInitialValueForRangeQueryCondition(tSKipListQueryCond *q, int8_t type) {
-//  q->lowerBndRelOptr = TSDB_RELATION_LARGE;
+//  q->lowerBndRelOptr = TSDB_RELATION_GREATER;
 //  q->upperBndRelOptr = TSDB_RELATION_LESS;
 //
 //  switch (type) {
@@ -504,60 +515,100 @@ void tExprTreeDestroy(tExprNode **pExpr, void (*fp)(void *)) {
 //  }
 //}
 
-//static void tSQLDoFilterInitialResult(tSkipList *pSkipList, bool (*fp)(), tQueryInfo *queryColInfo,
-//                                      tQueryResultset *result) {
-//  // primary key filter, search according to skiplist
-//  if (queryColInfo->colIdx == 0 && queryColInfo->optr != TSDB_RELATION_LIKE) {
-//    tSKipListQueryCond q;
-//    setInitialValueForRangeQueryCondition(&q, queryColInfo->q.nType);
-//
-//    switch (queryColInfo->optr) {
-//      case TSDB_RELATION_EQUAL: {
-//        result->num =
-//            tSkipListPointQuery(pSkipList, &queryColInfo->q, 1, INCLUDE_POINT_QUERY, (tSkipListNode ***)&result->pRes);
-//        break;
-//      }
-//      case TSDB_RELATION_NOT_EQUAL: {
-//        result->num =
-//            tSkipListPointQuery(pSkipList, &queryColInfo->q, 1, EXCLUDE_POINT_QUERY, (tSkipListNode ***)&result->pRes);
-//        break;
-//      }
-//      case TSDB_RELATION_LESS_EQUAL: {
-//        tVariantAssign(&q.upperBnd, &queryColInfo->q);
-//        q.upperBndRelOptr = queryColInfo->optr;
-//        result->num = tSkipListQuery(pSkipList, &q, (tSkipListNode ***)&result->pRes);
-//        break;
-//      }
-//      case TSDB_RELATION_LESS: {
-//        tVariantAssign(&q.upperBnd, &queryColInfo->q);
-//        result->num = tSkipListQuery(pSkipList, &q, (tSkipListNode ***)&result->pRes);
-//        break;
-//      }
-//      case TSDB_RELATION_LARGE: {
-//        tVariantAssign(&q.lowerBnd, &queryColInfo->q);
-//        result->num = tSkipListQuery(pSkipList, &q, (tSkipListNode ***)&result->pRes);
-//        break;
-//      }
-//      case TSDB_RELATION_LARGE_EQUAL: {
-//        tVariantAssign(&q.lowerBnd, &queryColInfo->q);
-//        q.lowerBndRelOptr = queryColInfo->optr;
-//        result->num = tSkipListQuery(pSkipList, &q, (tSkipListNode ***)&result->pRes);
-//        break;
-//      }
-//      default:
-//        pTrace("skiplist:%p, unsupport query operator:%d", pSkipList, queryColInfo->optr);
-//    }
-//
-//    tSkipListDestroyKey(&q.upperBnd);
-//    tSkipListDestroyKey(&q.lowerBnd);
-//  } else {
-//    /*
-//     * Brutal force scan the whole skiplit to find the appropriate result,
-//     * since the filter is not applied to indexed column.
-//     */
-//    result->num = tSkipListIterateList(pSkipList, (tSkipListNode ***)&result->pRes, fp, queryColInfo);
-//  }
-//}
+// todo check for malloc failure
+static int32_t setQueryCond(tQueryInfo *queryColInfo, SQueryCond* pCond) {
+  int32_t optr = queryColInfo->optr;
+  
+  if (optr == TSDB_RELATION_GREATER || optr == TSDB_RELATION_GREATER_EQUAL ||
+      optr == TSDB_RELATION_EQUAL || optr == TSDB_RELATION_NOT_EQUAL) {
+    pCond->start = calloc(1, sizeof(tVariant));
+    
+    tVariantAssign(&pCond->start->v, &queryColInfo->q);
+    pCond->start->optr = queryColInfo->optr;
+  } else if (optr == TSDB_RELATION_LESS || optr == TSDB_RELATION_LESS_EQUAL) {
+    pCond->end = calloc(1, sizeof(tVariant));
+    
+    tVariantAssign(&pCond->end->v, &queryColInfo->q);
+    pCond->end->optr = queryColInfo->optr;
+  }
+  
+  return TSDB_CODE_SUCCESS;
+}
+
+static void tQueryOnSkipList(SSkipList* pSkipList, SQueryCond* pCond, int32_t type, SArray* result) {
+  SSkipListIterator* iter = NULL;
+  
+  if (pCond->start != NULL) {
+    iter = tSkipListCreateIterFromVal(pSkipList, (char*) &pCond->start->v.i64Key, type, TSDB_ORDER_ASC);
+  } else {
+    iter = tSkipListCreateIterFromVal(pSkipList, (char*) &pCond->end->v.i64Key, type, TSDB_ORDER_DESC);
+  }
+  
+  __compar_fn_t func = getComparFunc(pSkipList->keyInfo.type, type);
+  
+  if (pCond->start != NULL) {
+    int32_t optr = pCond->start->optr;
+    
+    if (optr == TSDB_RELATION_EQUAL) {
+      while(tSkipListIterNext(iter)) {
+        SSkipListNode* pNode = tSkipListIterGet(iter);
+
+        int32_t ret = func(SL_GET_NODE_KEY(pSkipList, pNode), &pCond->start->v.i64Key);
+        if (ret == 0) {
+          taosArrayPush(result, SL_GET_NODE_DATA(pNode));
+        } else {
+          break;
+        }
+      }
+    } else if (optr == TSDB_RELATION_GREATER || optr == TSDB_RELATION_GREATER_EQUAL) {
+      bool comp = true;
+      int32_t ret = 0;
+      
+      while(tSkipListIterNext(iter)) {
+        SSkipListNode* pNode = tSkipListIterGet(iter);
+    
+        if (comp) {
+          ret = func(SL_GET_NODE_KEY(pSkipList, pNode), &pCond->start->v.i64Key);
+          assert(ret <= 0);
+        }
+        
+        if (ret == 0 && optr == TSDB_RELATION_GREATER) {
+          continue;
+        } else {
+          taosArrayPush(result, SL_GET_NODE_DATA(pNode));
+          comp = false;
+        }
+      }
+    } else if (optr == TSDB_RELATION_NOT_EQUAL) {
+      assert(0);
+    } else {
+      assert(0);
+    }
+  } else {
+    int32_t optr = pCond->end->optr;
+    
+    if (optr == TSDB_RELATION_LESS || optr == TSDB_RELATION_LESS_EQUAL) {
+      bool comp = true;
+      int32_t ret = 0;
+      
+      while(tSkipListIterNext(iter)) {
+        SSkipListNode* pNode = tSkipListIterGet(iter);
+      
+        if (comp) {
+          ret = func(SL_GET_NODE_KEY(pSkipList, pNode), &pCond->start->v.i64Key);
+          assert(ret >= 0);
+        }
+        
+        if (ret == 0 && optr == TSDB_RELATION_LESS) {
+          continue;
+        } else {
+          taosArrayPush(result, SL_GET_NODE_DATA(pNode));
+          comp = false;  // no need to compare anymore
+        }
+      }
+    }
+  }
+}
 
 /*
  * qsort comparator
@@ -670,9 +721,7 @@ static bool filterItem(tExprNode *pExpr, const void *pItem, SBinaryFilterSupp *p
   tExprNode *pLeft = pExpr->_node.pLeft;
   tExprNode *pRight = pExpr->_node.pRight;
 
-  /*
-   * non-leaf nodes, recursively traverse the syntax tree in the post-root order
-   */
+  //non-leaf nodes, recursively traverse the expression tree in the post-root order
   if (pLeft->nodeType == TSQL_NODE_EXPR && pRight->nodeType == TSQL_NODE_EXPR) {
     if (pExpr->_node.optr == TSDB_RELATION_OR) {  // or
       if (filterItem(pLeft, pItem, param)) {
@@ -707,7 +756,7 @@ static bool filterItem(tExprNode *pExpr, const void *pItem, SBinaryFilterSupp *p
  * @param pSchema   tag schemas
  * @param fp        filter callback function
  */
-static void tSQLBinaryTraverseOnResult(tExprNode *pExpr, SArray *pResult, SBinaryFilterSupp *param) {
+static void exprTreeTraverseImpl(tExprNode *pExpr, SArray *pResult, SBinaryFilterSupp *param) {
   size_t size = taosArrayGetSize(pResult);
   
   SArray* array = taosArrayInit(size, POINTER_BYTES);
@@ -736,12 +785,12 @@ static void tSQLBinaryTraverseOnSkipList(tExprNode *pExpr, SArray *pResult, SSki
 }
 
 // post-root order traverse syntax tree
-void tSQLBinaryExprTraverse(tExprNode *pExpr, SSkipList *pSkipList, SArray *result, SBinaryFilterSupp *param) {
+void tExprTreeTraverse(tExprNode *pExpr, SSkipList *pSkipList, SArray *result, SBinaryFilterSupp *param) {
   if (pExpr == NULL) {
     return;
   }
 
-  tExprNode *pLeft = pExpr->_node.pLeft;
+  tExprNode *pLeft  = pExpr->_node.pLeft;
   tExprNode *pRight = pExpr->_node.pRight;
 
   // recursive traverse left child branch
@@ -755,7 +804,7 @@ void tSQLBinaryExprTraverse(tExprNode *pExpr, SSkipList *pSkipList, SArray *resu
        *
        * if the query is a high selectivity filter, only small portion of meters are retrieved.
        */
-      tSQLBinaryTraverseOnResult(pExpr, result, param);
+      exprTreeTraverseImpl(pExpr, result, param);
     } else if (weight == 0) {
       /**
        * apply the hierarchical expression to every node in skiplist for find the qualified nodes
@@ -766,8 +815,8 @@ void tSQLBinaryExprTraverse(tExprNode *pExpr, SSkipList *pSkipList, SArray *resu
       SArray* rLeft  = taosArrayInit(10, POINTER_BYTES);
       SArray* rRight = taosArrayInit(10, POINTER_BYTES);
 
-      tSQLBinaryExprTraverse(pLeft, pSkipList, rLeft, param);
-      tSQLBinaryExprTraverse(pRight, pSkipList, rRight, param);
+      tExprTreeTraverse(pLeft, pSkipList, rLeft, param);
+      tExprTreeTraverse(pRight, pSkipList, rRight, param);
 
       if (pExpr->_node.optr == TSDB_RELATION_AND) {  // CROSS
         intersect(rLeft, rRight, result);
@@ -801,13 +850,13 @@ void tSQLBinaryExprTraverse(tExprNode *pExpr, SSkipList *pSkipList, SArray *resu
       assert(pFirst != pSecond && pFirst != NULL && pSecond != NULL);
 
       // we filter the result based on the skiplist index in the first place
-      tSQLBinaryExprTraverse(pFirst, pSkipList, result, param);
+      tExprTreeTraverse(pFirst, pSkipList, result, param);
 
       /*
        * recursively perform the filter operation based on the initial results,
-       * So, we do not set the skiplist index as a parameter
+       * So, we do not set the skip list index as a parameter
        */
-      tSQLBinaryExprTraverse(pSecond, NULL, result, param);
+      tExprTreeTraverse(pSecond, NULL, result, param);
     }
   } else {  // column project
     assert(pLeft->nodeType == TSQL_NODE_COL && pRight->nodeType == TSQL_NODE_VALUE);
@@ -816,8 +865,19 @@ void tSQLBinaryExprTraverse(tExprNode *pExpr, SSkipList *pSkipList, SArray *resu
     if (pSkipList == NULL) {
       tSQLListTraverseOnResult(pExpr, param->fp, result);
     } else {
-//      assert(result->num == 0);
-//      tSQLDoFilterInitialResult(pSkipList, param->fp, pExpr->info, result);
+      tQueryInfo *pQueryInfo = pExpr->_node.info;
+      
+      if (pQueryInfo->colIndex == 0 && pQueryInfo->optr != TSDB_RELATION_LIKE) {
+        SQueryCond cond = {0};
+        /*int32_t ret = */setQueryCond(pQueryInfo, &cond);
+        tQueryOnSkipList(pSkipList, &cond, pQueryInfo->q.nType, result);
+      } else {
+        /* Brutal force scan the whole skip list to find the appropriate result,
+         * since the filter is not applied to indexed column.
+         */
+        assert(0);
+//    result->num = tSkipListIterateList(pSkipList, (tSkipListNode ***)&result->pRes, fp, queryColInfo);
+      }
     }
   }
 }
@@ -1012,11 +1072,10 @@ static void exprTreeFromBinaryImpl(tExprNode** pExprTree, SBuffer* pBuf) {
   *pExprTree = pExpr;
 }
 
-tExprNode* exprTreeFromBinary(const void* pBuf, size_t size) {
+int32_t exprTreeFromBinary(const void* pBuf, size_t size, tExprNode** pExprNode) {
   SBuffer rbuf = {0};
   /*int32_t code =*/ tbufBeginRead(&rbuf, pBuf, size);
-  
-  tExprNode* pExprNode = NULL;
-  exprTreeFromBinaryImpl(&pExprNode, &rbuf);
-  return pExprNode;
-}
\ No newline at end of file
+  exprTreeFromBinaryImpl(pExprNode, &rbuf);
+  return TSDB_CODE_SUCCESS;
+}
+
diff --git a/src/query/src/qextbuffer.c b/src/query/src/qextbuffer.c
index d71d5669996ef306b7185d899c3eab52f893aa61..0195ae8b267464cebe346a3485fcf2185df115b6 100644
--- a/src/query/src/qextbuffer.c
+++ b/src/query/src/qextbuffer.c
@@ -345,7 +345,7 @@ static FORCE_INLINE int32_t primaryKeyComparator(int64_t f1, int64_t f2, int32_t
     return 0;
   }
   
-  if (colIdx == 0 && tsOrder == TSQL_SO_DESC) {  // primary column desc order
+  if (colIdx == 0 && tsOrder == TSDB_ORDER_DESC) {  // primary column desc order
     return (f1 < f2) ? 1 : -1;
   } else {  // asc
     return (f1 < f2) ? -1 : 1;
@@ -628,7 +628,7 @@ static int32_t qsort_call = 0;
 void tColDataQSort(tOrderDescriptor *pDescriptor, int32_t numOfRows, int32_t start, int32_t end, char *data,
                    int32_t orderType) {
   // short array sort, incur another sort procedure instead of quick sort process
-  __col_compar_fn_t compareFn = (orderType == TSQL_SO_ASC) ? compare_sa : compare_sd;
+  __col_compar_fn_t compareFn = (orderType == TSDB_ORDER_ASC) ? compare_sa : compare_sd;
 
   if (end - start + 1 <= 8) {
     tColDataInsertSort(pDescriptor, numOfRows, start, end, data, compareFn);
diff --git a/src/query/src/qinterpolation.c b/src/query/src/qinterpolation.c
index 1731e16ed82703753c59d2a8f34411b39eba8c3b..40fcf63c363912ff9f5eefaaf98ecdf91eaebf26 100644
--- a/src/query/src/qinterpolation.c
+++ b/src/query/src/qinterpolation.c
@@ -20,7 +20,7 @@
 #include "taosmsg.h"
 #include "tsqlfunction.h"
 
-#define INTERPOL_IS_ASC_INTERPOL(interp) ((interp)->order == TSQL_SO_ASC)
+#define INTERPOL_IS_ASC_INTERPOL(interp) ((interp)->order == TSDB_ORDER_ASC)
 
 int64_t taosGetIntervalStartTimestamp(int64_t startTime, int64_t timeRange, char intervalTimeUnit, int16_t precision) {
   if (timeRange == 0) {
@@ -96,7 +96,7 @@ void taosInterpoSetStartInfo(SInterpolationInfo* pInterpoInfo, int32_t numOfRawD
 }
 
 TSKEY taosGetRevisedEndKey(TSKEY ekey, int32_t order, int32_t timeInterval, int8_t intervalTimeUnit, int8_t precision) {
-  if (order == TSQL_SO_ASC) {
+  if (order == TSDB_ORDER_ASC) {
     return ekey;
   } else {
     return taosGetIntervalStartTimestamp(ekey, timeInterval, intervalTimeUnit, precision);
diff --git a/src/query/src/qpercentile.c b/src/query/src/qpercentile.c
index 3b12dee0538200903ae19f2a364ea2b75543a1ae..7283a9fd3ffa71d8eb2fff265da3b989259084eb 100644
--- a/src/query/src/qpercentile.c
+++ b/src/query/src/qpercentile.c
@@ -83,7 +83,7 @@ static tFilePage *loadIntoBucketFromDisk(tMemBucket *pMemBucket, int32_t segIdx,
     pListItem = pListItem->pNext;
   }
   
-  tColDataQSort(pDesc, buffer->numOfElems, 0, buffer->numOfElems - 1, buffer->data, TSQL_SO_ASC);
+  tColDataQSort(pDesc, buffer->numOfElems, 0, buffer->numOfElems - 1, buffer->data, TSDB_ORDER_ASC);
   
   pDesc->pColumnModel->capacity = oldCapacity;  // restore value
   return buffer;
diff --git a/src/query/src/qsyntaxtreefunction.c b/src/query/src/qsyntaxtreefunction.c
index d21f7dab736b1b14579f3b207da89695e93a1077..41e84b5ab02bab0599ae95388780364edf32d672 100644
--- a/src/query/src/qsyntaxtreefunction.c
+++ b/src/query/src/qsyntaxtreefunction.c
@@ -21,8 +21,8 @@
 
 #define ARRAY_LIST_OP(left, right, _left_type, _right_type, len1, len2, out, op, _res_type, _ord)     \
   {                                                                                                   \
-    int32_t i = ((_ord) == TSQL_SO_ASC) ? 0 : MAX(len1, len2) - 1;                                    \
-    int32_t step = ((_ord) == TSQL_SO_ASC) ? 1 : -1;                                                  \
+    int32_t i = ((_ord) == TSDB_ORDER_ASC) ? 0 : MAX(len1, len2) - 1;                                    \
+    int32_t step = ((_ord) == TSDB_ORDER_ASC) ? 1 : -1;                                                  \
                                                                                                       \
     if ((len1) == (len2)) {                                                                           \
       for (; i < (len2) && i >= 0; i += step, (out) += 1) {                                        \
@@ -53,8 +53,8 @@
 
 #define ARRAY_LIST_OP_REM(left, right, _left_type, _right_type, len1, len2, out, op, _res_type, _ord) \
   {                                                                                                   \
-    int32_t i = (_ord == TSQL_SO_ASC) ? 0 : MAX(len1, len2) - 1;                                      \
-    int32_t step = (_ord == TSQL_SO_ASC) ? 1 : -1;                                                    \
+    int32_t i = (_ord == TSDB_ORDER_ASC) ? 0 : MAX(len1, len2) - 1;                                      \
+    int32_t step = (_ord == TSDB_ORDER_ASC) ? 1 : -1;                                                    \
                                                                                                       \
     if (len1 == (len2)) {                                                                             \
       for (; i >= 0 && i < (len2); i += step, (out) += 1) {                                        \
@@ -107,8 +107,8 @@ void calc_fn_i32_i32_add(void *left, void *right, int32_t numLeft, int32_t numRi
   int32_t *pRight = (int32_t *)right;
   double * pOutput = (double *)output;
 
-  int32_t i = (order == TSQL_SO_ASC) ? 0 : MAX(numLeft, numRight) - 1;
-  int32_t step = (order == TSQL_SO_ASC) ? 1 : -1;
+  int32_t i = (order == TSDB_ORDER_ASC) ? 0 : MAX(numLeft, numRight) - 1;
+  int32_t step = (order == TSDB_ORDER_ASC) ? 1 : -1;
 
   if (numLeft == numRight) {
     for (; i >= 0 && i < numRight; i += step, pOutput += 1) {
@@ -305,8 +305,8 @@ void calc_fn_i32_i32_sub(void *left, void *right, int32_t numLeft, int32_t numRi
   int32_t *pRight = (int32_t *)right;
   double * pOutput = (double *)output;
 
-  int32_t i = (order == TSQL_SO_ASC) ? 0 : MAX(numLeft, numRight) - 1;
-  int32_t step = (order == TSQL_SO_ASC) ? 1 : -1;
+  int32_t i = (order == TSDB_ORDER_ASC) ? 0 : MAX(numLeft, numRight) - 1;
+  int32_t step = (order == TSDB_ORDER_ASC) ? 1 : -1;
 
   if (numLeft == numRight) {
     for (; i >= 0 && i < numRight; i += step, pOutput += 1) {
@@ -516,8 +516,8 @@ void calc_fn_i32_i32_multi(void *left, void *right, int32_t numLeft, int32_t num
   int32_t *pRight = (int32_t *)right;
   double * pOutput = (double *)output;
 
-  int32_t i = (order == TSQL_SO_ASC) ? 0 : MAX(numLeft, numRight) - 1;
-  int32_t step = (order == TSQL_SO_ASC) ? 1 : -1;
+  int32_t i = (order == TSDB_ORDER_ASC) ? 0 : MAX(numLeft, numRight) - 1;
+  int32_t step = (order == TSDB_ORDER_ASC) ? 1 : -1;
 
   if (numLeft == numRight) {
     for (; i >= 0 && i < numRight; i += step, pOutput += 1) {
@@ -714,8 +714,8 @@ void calc_fn_i32_i32_div(void *left, void *right, int32_t numLeft, int32_t numRi
   int32_t *pRight = (int32_t *)right;
   double * pOutput = (double *)output;
 
-  int32_t i = (order == TSQL_SO_ASC) ? 0 : MAX(numLeft, numRight) - 1;
-  int32_t step = (order == TSQL_SO_ASC) ? 1 : -1;
+  int32_t i = (order == TSDB_ORDER_ASC) ? 0 : MAX(numLeft, numRight) - 1;
+  int32_t step = (order == TSDB_ORDER_ASC) ? 1 : -1;
 
   if (numLeft == numRight) {
     for (; i >= 0 && i < numRight; i += step, pOutput += 1) {
@@ -928,8 +928,8 @@ void calc_fn_i32_i32_rem(void *left, void *right, int32_t numLeft, int32_t numRi
   int32_t *pRight = (int32_t *)right;
   double * pOutput = (double *)output;
 
-  int32_t i = (order == TSQL_SO_ASC) ? 0 : MAX(numLeft, numRight) - 1;
-  int32_t step = (order == TSQL_SO_ASC) ? 1 : -1;
+  int32_t i = (order == TSDB_ORDER_ASC) ? 0 : MAX(numLeft, numRight) - 1;
+  int32_t step = (order == TSDB_ORDER_ASC) ? 1 : -1;
 
   if (numLeft == numRight) {
     for (; i >= 0 && i < numRight; i += step, pOutput += 1) {
@@ -986,8 +986,8 @@ void calc_fn_i32_d_rem(void *left, void *right, int32_t numLeft, int32_t numRigh
   double * pRight = (double *)right;
   double * pOutput = (double *)output;
 
-  int32_t i = (order == TSQL_SO_ASC) ? 0 : MAX(numLeft, numRight) - 1;
-  int32_t step = (order == TSQL_SO_ASC) ? 1 : -1;
+  int32_t i = (order == TSDB_ORDER_ASC) ? 0 : MAX(numLeft, numRight) - 1;
+  int32_t step = (order == TSDB_ORDER_ASC) ? 1 : -1;
 
   if (numLeft == numRight) {
     for (; i >= 0 && i < numRight; i += step, pOutput += 1) {
diff --git a/src/query/src/qtsbuf.c b/src/query/src/qtsbuf.c
index ea6e6dfdc0f6db5f18b2254887df028f75233fa6..062a8038b2699a7be77e7eca3290fedfe9321785 100644
--- a/src/query/src/qtsbuf.c
+++ b/src/query/src/qtsbuf.c
@@ -33,11 +33,11 @@ STSBuf* tsBufCreate(bool autoDelete) {
   }
   
   // update the header info
-  STSBufFileHeader header = {.magic = TS_COMP_FILE_MAGIC, .numOfVnode = pTSBuf->numOfVnodes, .tsOrder = TSQL_SO_ASC};
+  STSBufFileHeader header = {.magic = TS_COMP_FILE_MAGIC, .numOfVnode = pTSBuf->numOfVnodes, .tsOrder = TSDB_ORDER_ASC};
   STSBufUpdateHeader(pTSBuf, &header);
   
   tsBufResetPos(pTSBuf);
-  pTSBuf->cur.order = TSQL_SO_ASC;
+  pTSBuf->cur.order = TSDB_ORDER_ASC;
   
   pTSBuf->autoDelete = autoDelete;
   pTSBuf->tsOrder = -1;
@@ -88,7 +88,7 @@ STSBuf* tsBufCreateFromFile(const char* path, bool autoDelete) {
   
   // check the ts order
   pTSBuf->tsOrder = header.tsOrder;
-  if (pTSBuf->tsOrder != TSQL_SO_ASC && pTSBuf->tsOrder != TSQL_SO_DESC) {
+  if (pTSBuf->tsOrder != TSDB_ORDER_ASC && pTSBuf->tsOrder != TSDB_ORDER_DESC) {
 //    tscError("invalid order info in buf:%d", pTSBuf->tsOrder);
     tsBufDestory(pTSBuf);
     return NULL;
@@ -118,7 +118,7 @@ STSBuf* tsBufCreateFromFile(const char* path, bool autoDelete) {
   tsBufResetPos(pTSBuf);
   
   // ascending by default
-  pTSBuf->cur.order = TSQL_SO_ASC;
+  pTSBuf->cur.order = TSDB_ORDER_ASC;
   
   pTSBuf->autoDelete = autoDelete;
   
@@ -274,7 +274,7 @@ STSBlock* readDataFromDisk(STSBuf* pTSBuf, int32_t order, bool decomp) {
   memset(pBlock, 0, sizeof(STSBlock));
   pBlock->payload = tmp;
   
-  if (order == TSQL_SO_DESC) {
+  if (order == TSDB_ORDER_DESC) {
     /*
      * set the right position for the reversed traverse, the reversed traverse is started from
      * the end of each comp data block
@@ -303,7 +303,7 @@ STSBlock* readDataFromDisk(STSBuf* pTSBuf, int32_t order, bool decomp) {
   fread(&pBlock->padding, sizeof(pBlock->padding), 1, pTSBuf->f);
   
   // for backwards traverse, set the start position at the end of previous block
-  if (order == TSQL_SO_DESC) {
+  if (order == TSDB_ORDER_DESC) {
     int32_t offset = pBlock->compLen + sizeof(pBlock->compLen) * 2 + sizeof(pBlock->numOfElem) + sizeof(pBlock->tag);
     int64_t r = fseek(pTSBuf->f, -offset, SEEK_CUR);
     UNUSED(r);
@@ -321,9 +321,9 @@ static int32_t setCheckTSOrder(STSBuf* pTSBuf, const char* pData, int32_t len) {
       TSKEY lastKey = *(TSKEY*)(ptsData->rawBuf + ptsData->len - TSDB_KEYSIZE);
       
       if (lastKey > *(TSKEY*)pData) {
-        pTSBuf->tsOrder = TSQL_SO_DESC;
+        pTSBuf->tsOrder = TSDB_ORDER_DESC;
       } else {
-        pTSBuf->tsOrder = TSQL_SO_ASC;
+        pTSBuf->tsOrder = TSDB_ORDER_ASC;
       }
     } else if (len > TSDB_KEYSIZE) {
       // no data in current vnode, more than one ts is added, check the orders
@@ -331,9 +331,9 @@ static int32_t setCheckTSOrder(STSBuf* pTSBuf, const char* pData, int32_t len) {
       TSKEY k2 = *(TSKEY*)(pData + TSDB_KEYSIZE);
       
       if (k1 < k2) {
-        pTSBuf->tsOrder = TSQL_SO_ASC;
+        pTSBuf->tsOrder = TSDB_ORDER_ASC;
       } else if (k1 > k2) {
-        pTSBuf->tsOrder = TSQL_SO_DESC;
+        pTSBuf->tsOrder = TSDB_ORDER_DESC;
       } else {
         // todo handle error
       }
@@ -432,13 +432,13 @@ static int32_t tsBufFindBlock(STSBuf* pTSBuf, STSVnodeBlockInfo* pBlockInfo, int
   bool    decomp = false;
   
   while ((i++) <= blockIndex) {
-    if (readDataFromDisk(pTSBuf, TSQL_SO_ASC, decomp) == NULL) {
+    if (readDataFromDisk(pTSBuf, TSDB_ORDER_ASC, decomp) == NULL) {
       return -1;
     }
   }
   
   // set the file position to be the end of previous comp block
-  if (pTSBuf->cur.order == TSQL_SO_DESC) {
+  if (pTSBuf->cur.order == TSDB_ORDER_DESC) {
     STSBlock* pBlock = &pTSBuf->block;
     int32_t   compBlockSize =
         pBlock->compLen + sizeof(pBlock->compLen) * 2 + sizeof(pBlock->numOfElem) + sizeof(pBlock->tag);
@@ -452,7 +452,7 @@ static int32_t tsBufFindBlockByTag(STSBuf* pTSBuf, STSVnodeBlockInfo* pBlockInfo
   bool decomp = false;
   
   int64_t offset = 0;
-  if (pTSBuf->cur.order == TSQL_SO_ASC) {
+  if (pTSBuf->cur.order == TSDB_ORDER_ASC) {
     offset = pBlockInfo->offset;
   } else {  // reversed traverse starts from the end of block
     offset = pBlockInfo->offset + pBlockInfo->compLen;
@@ -482,8 +482,8 @@ static void tsBufGetBlock(STSBuf* pTSBuf, int32_t vnodeIndex, int32_t blockIndex
   }
   
   STSCursor* pCur = &pTSBuf->cur;
-  if (pCur->vnodeIndex == vnodeIndex && ((pCur->blockIndex <= blockIndex && pCur->order == TSQL_SO_ASC) ||
-      (pCur->blockIndex >= blockIndex && pCur->order == TSQL_SO_DESC))) {
+  if (pCur->vnodeIndex == vnodeIndex && ((pCur->blockIndex <= blockIndex && pCur->order == TSDB_ORDER_ASC) ||
+      (pCur->blockIndex >= blockIndex && pCur->order == TSDB_ORDER_DESC))) {
     int32_t i = 0;
     bool    decomp = false;
     int32_t step = abs(blockIndex - pCur->blockIndex);
@@ -520,7 +520,7 @@ static void tsBufGetBlock(STSBuf* pTSBuf, int32_t vnodeIndex, int32_t blockIndex
   pCur->vnodeIndex = vnodeIndex;
   pCur->blockIndex = blockIndex;
   
-  pCur->tsIndex = (pCur->order == TSQL_SO_ASC) ? 0 : pBlock->numOfElem - 1;
+  pCur->tsIndex = (pCur->order == TSDB_ORDER_ASC) ? 0 : pBlock->numOfElem - 1;
 }
 
 STSVnodeBlockInfo* tsBufGetVnodeBlockInfo(STSBuf* pTSBuf, int32_t vnodeId) {
@@ -555,7 +555,7 @@ bool tsBufNextPos(STSBuf* pTSBuf) {
   
   // get the first/last position according to traverse order
   if (pCur->vnodeIndex == -1) {
-    if (pCur->order == TSQL_SO_ASC) {
+    if (pCur->order == TSDB_ORDER_ASC) {
       tsBufGetBlock(pTSBuf, 0, 0);
       
       if (pTSBuf->block.numOfElem == 0) {  // the whole list is empty, return
@@ -587,20 +587,20 @@ bool tsBufNextPos(STSBuf* pTSBuf) {
     }
   }
   
-  int32_t step = pCur->order == TSQL_SO_ASC ? 1 : -1;
+  int32_t step = pCur->order == TSDB_ORDER_ASC ? 1 : -1;
   
   while (1) {
     assert(pTSBuf->tsData.len == pTSBuf->block.numOfElem * TSDB_KEYSIZE);
     
-    if ((pCur->order == TSQL_SO_ASC && pCur->tsIndex >= pTSBuf->block.numOfElem - 1) ||
-        (pCur->order == TSQL_SO_DESC && pCur->tsIndex <= 0)) {
+    if ((pCur->order == TSDB_ORDER_ASC && pCur->tsIndex >= pTSBuf->block.numOfElem - 1) ||
+        (pCur->order == TSDB_ORDER_DESC && pCur->tsIndex <= 0)) {
       int32_t vnodeId = pTSBuf->pData[pCur->vnodeIndex].info.vnode;
       
       STSVnodeBlockInfo* pBlockInfo = tsBufGetVnodeBlockInfo(pTSBuf, vnodeId);
-      if (pBlockInfo == NULL || (pCur->blockIndex >= pBlockInfo->numOfBlocks - 1 && pCur->order == TSQL_SO_ASC) ||
-          (pCur->blockIndex <= 0 && pCur->order == TSQL_SO_DESC)) {
-        if ((pCur->vnodeIndex >= pTSBuf->numOfVnodes - 1 && pCur->order == TSQL_SO_ASC) ||
-            (pCur->vnodeIndex <= 0 && pCur->order == TSQL_SO_DESC)) {
+      if (pBlockInfo == NULL || (pCur->blockIndex >= pBlockInfo->numOfBlocks - 1 && pCur->order == TSDB_ORDER_ASC) ||
+          (pCur->blockIndex <= 0 && pCur->order == TSDB_ORDER_DESC)) {
+        if ((pCur->vnodeIndex >= pTSBuf->numOfVnodes - 1 && pCur->order == TSDB_ORDER_ASC) ||
+            (pCur->vnodeIndex <= 0 && pCur->order == TSDB_ORDER_DESC)) {
           pCur->vnodeIndex = -1;
           return false;
         }
@@ -609,7 +609,7 @@ bool tsBufNextPos(STSBuf* pTSBuf) {
           return false;
         }
         
-        int32_t blockIndex = pCur->order == TSQL_SO_ASC ? 0 : pBlockInfo->numOfBlocks - 1;
+        int32_t blockIndex = pCur->order == TSDB_ORDER_ASC ? 0 : pBlockInfo->numOfBlocks - 1;
         tsBufGetBlock(pTSBuf, pCur->vnodeIndex + step, blockIndex);
         break;
         
@@ -766,7 +766,7 @@ STSBuf* tsBufCreateFromCompBlocks(const char* pData, int32_t numOfBlocks, int32_
   pTSBuf->fileSize += len;
   
   pTSBuf->tsOrder = order;
-  assert(order == TSQL_SO_ASC || order == TSQL_SO_DESC);
+  assert(order == TSDB_ORDER_ASC || order == TSDB_ORDER_DESC);
   
   STSBufFileHeader header = {
       .magic = TS_COMP_FILE_MAGIC, .numOfVnode = pTSBuf->numOfVnodes, .tsOrder = pTSBuf->tsOrder};
@@ -850,7 +850,7 @@ void tsBufDisplay(STSBuf* pTSBuf) {
   printf("number of vnode:%d\n", pTSBuf->numOfVnodes);
   
   int32_t old = pTSBuf->cur.order;
-  pTSBuf->cur.order = TSQL_SO_ASC;
+  pTSBuf->cur.order = TSDB_ORDER_ASC;
   
   tsBufResetPos(pTSBuf);
   
diff --git a/src/query/src/queryExecutor.c b/src/query/src/queryExecutor.c
index 5af0cdc687866b051612caf5ff96c96743c7daaa..9cb2dcd6c69a7f85570808b9dfdce48002ce069d 100644
--- a/src/query/src/queryExecutor.c
+++ b/src/query/src/queryExecutor.c
@@ -52,9 +52,9 @@
 
 /* get the qinfo struct address from the query struct address */
 #define GET_COLUMN_BYTES(query, colidx) \
-  ((query)->colList[(query)->pSelectExpr[colidx].pBase.colInfo.colIdx].info.bytes)
+  ((query)->colList[(query)->pSelectExpr[colidx].pBase.colInfo.colIndex].info.bytes)
 #define GET_COLUMN_TYPE(query, colidx) \
-  ((query)->colList[(query)->pSelectExpr[colidx].pBase.colInfo.colIdx].info.type)
+  ((query)->colList[(query)->pSelectExpr[colidx].pBase.colInfo.colIndex].info.type)
 
 typedef struct SPointInterpoSupporter {
   int32_t numOfCols;
@@ -279,6 +279,7 @@ int64_t getNumOfResult(SQueryRuntimeEnv *pRuntimeEnv) {
     }
   }
 
+  assert(maxOutput >= 0);
   return maxOutput;
 }
 
@@ -293,13 +294,13 @@ bool isGroupbyNormalCol(SSqlGroupbyExpr *pGroupbyExpr) {
   }
 
   for (int32_t i = 0; i < pGroupbyExpr->numOfGroupCols; ++i) {
-    SColIndexEx *pColIndex = &pGroupbyExpr->columnInfo[i];
+    SColIndex *pColIndex = &pGroupbyExpr->columnInfo[i];
     if (pColIndex->flag == TSDB_COL_NORMAL) {
       /*
        * make sure the normal column locates at the second position if tbname exists in group by clause
        */
       if (pGroupbyExpr->numOfGroupCols > 1) {
-        assert(pColIndex->colIdx > 0);
+        assert(pColIndex->colIndex > 0);
       }
 
       return true;
@@ -316,7 +317,7 @@ int16_t getGroupbyColumnType(SQuery *pQuery, SSqlGroupbyExpr *pGroupbyExpr) {
   int16_t type = TSDB_DATA_TYPE_NULL;
 
   for (int32_t i = 0; i < pGroupbyExpr->numOfGroupCols; ++i) {
-    SColIndexEx *pColIndex = &pGroupbyExpr->columnInfo[i];
+    SColIndex *pColIndex = &pGroupbyExpr->columnInfo[i];
     if (pColIndex->flag == TSDB_COL_NORMAL) {
       colId = pColIndex->colId;
       break;
@@ -361,8 +362,8 @@ bool isTSCompQuery(SQuery *pQuery) { return pQuery->pSelectExpr[0].pBase.functio
 bool doRevisedResultsByLimit(SQInfo *pQInfo) {
   SQuery *pQuery = pQInfo->runtimeEnv.pQuery;
 
-  if ((pQuery->limit.limit > 0) && (pQuery->rec.size + pQuery->rec.size > pQuery->limit.limit)) {
-    pQuery->rec.size = pQuery->limit.limit - pQuery->rec.size;
+  if ((pQuery->limit.limit > 0) && (pQuery->rec.rows + pQuery->rec.rows > pQuery->limit.limit)) {
+    pQuery->rec.rows = pQuery->limit.limit - pQuery->rec.rows;
 
     // query completed
     setQueryStatus(pQuery, QUERY_COMPLETED);
@@ -389,7 +390,7 @@ static bool isTopBottomQuery(SQuery *pQuery) {
 
 static SDataStatis *getStatisInfo(SQuery *pQuery, SDataStatis *pStatis, SDataBlockInfo *pDataBlockInfo, int32_t index) {
   // for a tag column, no corresponding field info
-  SColIndexEx *pColIndexEx = &pQuery->pSelectExpr[index].pBase.colInfo;
+  SColIndex *pColIndexEx = &pQuery->pSelectExpr[index].pBase.colInfo;
   if (TSDB_COL_IS_TAG(pColIndexEx->flag)) {
     return NULL;
   }
@@ -417,7 +418,7 @@ static SDataStatis *getStatisInfo(SQuery *pQuery, SDataStatis *pStatis, SDataBlo
  */
 static bool hasNullValue(SQuery *pQuery, int32_t col, SDataBlockInfo *pDataBlockInfo, SDataStatis *pStatis,
                          SDataStatis **pColStatis) {
-  SColIndexEx* pColIndex = &pQuery->pSelectExpr[col].pBase.colInfo;
+  SColIndex* pColIndex = &pQuery->pSelectExpr[col].pBase.colInfo;
   if (TSDB_COL_IS_TAG(pColIndex->flag)) {
     return false;
   }
@@ -592,7 +593,7 @@ static int32_t getForwardStepsInBlock(int32_t numOfPoints, __block_search_fn_t s
   int32_t forwardStep = 0;
 
   if (endPos >= 0) {
-    forwardStep = (order == TSQL_SO_ASC) ? (endPos - pos) : (pos - endPos);
+    forwardStep = (order == TSDB_ORDER_ASC) ? (endPos - pos) : (pos - endPos);
     assert(forwardStep >= 0);
 
     // endPos data is equalled to the key so, we do need to read the element in endPos
@@ -669,7 +670,7 @@ static void doCheckQueryCompleted(SQueryRuntimeEnv *pRuntimeEnv, TSKEY lastKey,
 static int32_t getNumOfRowsInTimeWindow(SQuery *pQuery, SDataBlockInfo *pDataBlockInfo, TSKEY *pPrimaryColumn,
                                         int32_t startPos, TSKEY ekey, __block_search_fn_t searchFn,
                                         bool updateLastKey) {
-  assert(startPos >= 0 && startPos < pDataBlockInfo->size);
+  assert(startPos >= 0 && startPos < pDataBlockInfo->rows);
 
   int32_t num = -1;
   int32_t order = pQuery->order.order;
@@ -678,7 +679,7 @@ static int32_t getNumOfRowsInTimeWindow(SQuery *pQuery, SDataBlockInfo *pDataBlo
 
   if (QUERY_IS_ASC_QUERY(pQuery)) {
     if (ekey < pDataBlockInfo->window.ekey) {
-      num = getForwardStepsInBlock(pDataBlockInfo->size, searchFn, ekey, startPos, order, pPrimaryColumn);
+      num = getForwardStepsInBlock(pDataBlockInfo->rows, searchFn, ekey, startPos, order, pPrimaryColumn);
       if (num == 0) {  // no qualified data in current block, do not update the lastKey value
         assert(ekey < pPrimaryColumn[startPos]);
       } else {
@@ -687,14 +688,14 @@ static int32_t getNumOfRowsInTimeWindow(SQuery *pQuery, SDataBlockInfo *pDataBlo
         }
       }
     } else {
-      num = pDataBlockInfo->size - startPos;
+      num = pDataBlockInfo->rows - startPos;
       if (updateLastKey) {
         pQuery->lastKey = pDataBlockInfo->window.ekey + step;
       }
     }
   } else {  // desc
     if (ekey > pDataBlockInfo->window.skey) {
-      num = getForwardStepsInBlock(pDataBlockInfo->size, searchFn, ekey, startPos, order, pPrimaryColumn);
+      num = getForwardStepsInBlock(pDataBlockInfo->rows, searchFn, ekey, startPos, order, pPrimaryColumn);
       if (num == 0) {  // no qualified data in current block, do not update the lastKey value
         assert(ekey > pPrimaryColumn[startPos]);
       } else {
@@ -787,7 +788,7 @@ static int32_t getNextQualifiedWindow(SQueryRuntimeEnv *pRuntimeEnv, STimeWindow
       }
     }
 
-    int32_t startPos = searchFn((char *)primaryKeys, pDataBlockInfo->size, startKey, pQuery->order.order);
+    int32_t startPos = searchFn((char *)primaryKeys, pDataBlockInfo->rows, startKey, pQuery->order.order);
 
     /*
      * This time window does not cover any data, try next time window,
@@ -850,12 +851,12 @@ char *getDataBlocks(SQueryRuntimeEnv *pRuntimeEnv, SArithmeticSupport *sas, int3
     sas->numOfCols = pQuery->numOfCols;
     sas->offset = 0;
   } else {  // other type of query function
-    SColIndexEx *pCol = &pQuery->pSelectExpr[col].pBase.colInfo;
+    SColIndex *pCol = &pQuery->pSelectExpr[col].pBase.colInfo;
     if (TSDB_COL_IS_TAG(pCol->flag)) {
       dataBlock = NULL;
     } else {
       /*
-       *  the colIdx is acquired from the first meter of all qualified meters in this vnode during query prepare stage,
+       *  the colIndex is acquired from the first meter of all qualified meters in this vnode during query prepare stage,
        *  the remain meter may not have the required column in cache actually.
        *  So, the validation of required column in cache with the corresponding meter schema is reinforced.
        */
@@ -887,7 +888,7 @@ char *getDataBlocks(SQueryRuntimeEnv *pRuntimeEnv, SArithmeticSupport *sas, int3
  * @return                  the incremental number of output value, so it maybe 0 for fixed number of query,
  *                          such as count/min/max etc.
  */
-static int32_t blockwiseApplyAllFunctions(SQueryRuntimeEnv *pRuntimeEnv, SDataStatis *pStatis,
+static void blockwiseApplyAllFunctions(SQueryRuntimeEnv *pRuntimeEnv, SDataStatis *pStatis,
                                           SDataBlockInfo *pDataBlockInfo, SWindowResInfo *pWindowResInfo,
                                           __block_search_fn_t searchFn, SArray *pDataBlock) {
   SQLFunctionCtx *pCtx = pRuntimeEnv->pCtx;
@@ -901,9 +902,7 @@ static int32_t blockwiseApplyAllFunctions(SQueryRuntimeEnv *pRuntimeEnv, SDataSt
     primaryKeyCol = (TSKEY *)(pColInfo->pData);
   }
 
-  pQuery->pos = QUERY_IS_ASC_QUERY(pQuery) ? 0 : pDataBlockInfo->size - 1;
-  int64_t prevNumOfRes = getNumOfResult(pRuntimeEnv);
-
+  pQuery->pos = QUERY_IS_ASC_QUERY(pQuery) ? 0 : pDataBlockInfo->rows - 1;
   SArithmeticSupport *sasArray = calloc((size_t)pQuery->numOfOutputCols, sizeof(SArithmeticSupport));
 
   for (int32_t k = 0; k < pQuery->numOfOutputCols; ++k) {
@@ -912,9 +911,9 @@ static int32_t blockwiseApplyAllFunctions(SQueryRuntimeEnv *pRuntimeEnv, SDataSt
     SDataStatis *tpField = NULL;
     
     bool hasNull = hasNullValue(pQuery, k, pDataBlockInfo, pStatis, &tpField);
-    char *dataBlock = getDataBlocks(pRuntimeEnv, &sasArray[k], k, pDataBlockInfo->size, pDataBlock);
+    char *dataBlock = getDataBlocks(pRuntimeEnv, &sasArray[k], k, pDataBlockInfo->rows, pDataBlock);
 
-    setExecParams(pQuery, &pCtx[k], dataBlock, primaryKeyCol, pDataBlockInfo->size, functionId, tpField,
+    setExecParams(pQuery, &pCtx[k], dataBlock, primaryKeyCol, pDataBlockInfo->rows, functionId, tpField,
                   hasNull, &sasArray[k], pRuntimeEnv->scanFlag);
   }
 
@@ -924,11 +923,9 @@ static int32_t blockwiseApplyAllFunctions(SQueryRuntimeEnv *pRuntimeEnv, SDataSt
     TSKEY   ts = primaryKeyCol[offset];
 
     STimeWindow win = getActiveTimeWindow(pWindowResInfo, ts, pQuery);
-    assert(0);
-    //    if (setWindowOutputBufByKey(pRuntimeEnv, pWindowResInfo, pRuntimeEnv->pTabObj->sid, &win) !=
-    //    TSDB_CODE_SUCCESS) {
-    //      return 0;
-    //    }
+    if (setWindowOutputBufByKey(pRuntimeEnv, pWindowResInfo, pDataBlockInfo->sid, &win) != TSDB_CODE_SUCCESS) {
+      return;
+    }
 
     TSKEY   ekey = reviseWindowEkey(pQuery, &win);
     int32_t forwardStep =
@@ -948,10 +945,7 @@ static int32_t blockwiseApplyAllFunctions(SQueryRuntimeEnv *pRuntimeEnv, SDataSt
       }
 
       // null data, failed to allocate more memory buffer
-      //      int32_t sid = pRuntimeEnv->pTabObj->sid;
-      int32_t sid = 0;
-      assert(0);
-      if (setWindowOutputBufByKey(pRuntimeEnv, pWindowResInfo, sid, &nextWin) != TSDB_CODE_SUCCESS) {
+      if (setWindowOutputBufByKey(pRuntimeEnv, pWindowResInfo, pDataBlockInfo->sid, &nextWin) != TSDB_CODE_SUCCESS) {
         break;
       }
 
@@ -959,7 +953,6 @@ static int32_t blockwiseApplyAllFunctions(SQueryRuntimeEnv *pRuntimeEnv, SDataSt
       forwardStep = getNumOfRowsInTimeWindow(pQuery, pDataBlockInfo, primaryKeyCol, startPos, ekey, searchFn, true);
 
       pStatus = getTimeWindowResStatus(pWindowResInfo, curTimeWindow(pWindowResInfo));
-
       doBlockwiseApplyFunctions(pRuntimeEnv, pStatus, &nextWin, startPos, forwardStep, primaryKeyCol);
     }
 
@@ -977,18 +970,8 @@ static int32_t blockwiseApplyAllFunctions(SQueryRuntimeEnv *pRuntimeEnv, SDataSt
       }
     }
   }
-
-  /*
-   * No need to calculate the number of output results for group-by normal columns, interval query
-   * because the results of group by normal column is put into intermediate buffer.
-   */
-  int32_t num = 0;
-  if (!isIntervalQuery(pQuery)) {
-    num = getNumOfResult(pRuntimeEnv) - prevNumOfRes;
-  }
-
+  
   tfree(sasArray);
-  return (int32_t)num;
 }
 
 static int32_t setGroupResultOutputBuf(SQueryRuntimeEnv *pRuntimeEnv, char *pData, int16_t type, int16_t bytes) {
@@ -1137,9 +1120,9 @@ static int32_t rowwiseApplyAllFunctions(SQueryRuntimeEnv *pRuntimeEnv, SDataStat
     SDataStatis *pColStatis = NULL;
 
     bool  hasNull = hasNullValue(pQuery, k, pDataBlockInfo, pStatis, &pColStatis);
-    char *dataBlock = getDataBlocks(pRuntimeEnv, &sasArray[k], k, pDataBlockInfo->size, pDataBlock);
+    char *dataBlock = getDataBlocks(pRuntimeEnv, &sasArray[k], k, pDataBlockInfo->rows, pDataBlock);
 
-    setExecParams(pQuery, &pCtx[k], dataBlock, primaryKeyCol, pDataBlockInfo->size, functionId, pColStatis,
+    setExecParams(pQuery, &pCtx[k], dataBlock, primaryKeyCol, pDataBlockInfo->rows, functionId, pColStatis,
                   hasNull, &sasArray[k], pRuntimeEnv->scanFlag);
   }
 
@@ -1161,14 +1144,14 @@ static int32_t rowwiseApplyAllFunctions(SQueryRuntimeEnv *pRuntimeEnv, SDataStat
   // from bottom to top in asc order
   if (pRuntimeEnv->pTSBuf != NULL) {
     SQInfo *pQInfo = (SQInfo *)GET_QINFO_ADDR(pQuery);
-    qTrace("QInfo:%p process data rows, numOfRows:%d, query order:%d, ts comp order:%d", pQInfo, pDataBlockInfo->size,
+    qTrace("QInfo:%p process data rows, numOfRows:%d, query order:%d, ts comp order:%d", pQInfo, pDataBlockInfo->rows,
            pQuery->order.order, pRuntimeEnv->pTSBuf->cur.order);
   }
 
   int32_t j = 0;
   TSKEY   lastKey = -1;
 
-  for (j = 0; j < pDataBlockInfo->size; ++j) {
+  for (j = 0; j < pDataBlockInfo->rows; ++j) {
     int32_t offset = GET_COL_DATA_POS(pQuery, j, step);
 
     if (pRuntimeEnv->pTSBuf != NULL) {
@@ -1270,7 +1253,7 @@ static int32_t rowwiseApplyAllFunctions(SQueryRuntimeEnv *pRuntimeEnv, SDataStat
      * pointsOffset is the maximum available space in result buffer update the actual forward step for query that
      * requires checking buffer during loop
      */
-    if ((pQuery->checkBufferInLoop == 1) && (++numOfRes) >= pQuery->pointsOffset) {
+    if ((pQuery->checkBuffer == 1) && (++numOfRes) >= pQuery->pointsOffset) {
       pQuery->lastKey = lastKey + step;
       assert(0);
       //      *forwardStep = j + 1;
@@ -1296,7 +1279,7 @@ static UNUSED_FUNC int32_t reviseForwardSteps(SQueryRuntimeEnv *pRuntimeEnv, int
   /*
    * 1. If value filter exists, we try all data in current block, and do not set the QUERY_RESBUF_FULL flag.
    *
-   * 2. In case of top/bottom/ts_comp query, the checkBufferInLoop == 1 and pQuery->numOfFilterCols
+   * 2. In case of top/bottom/ts_comp query, the checkBuffer == 1 and pQuery->numOfFilterCols
    * may be 0 or not. We do not check the capacity of output buffer, since the filter function will do it.
    *
    * 3. In handling the query of secondary query of join, tsBuf servers as a ts filter.
@@ -1308,7 +1291,7 @@ static UNUSED_FUNC int32_t reviseForwardSteps(SQueryRuntimeEnv *pRuntimeEnv, int
   }
 
   // current buffer does not have enough space, try in the next loop
-  if ((pQuery->checkBufferInLoop == 1) && (pQuery->pointsOffset <= forwardStep)) {
+  if ((pQuery->checkBuffer == 1) && (pQuery->pointsOffset <= forwardStep)) {
     forwardStep = pQuery->pointsOffset;
   }
 
@@ -1316,17 +1299,17 @@ static UNUSED_FUNC int32_t reviseForwardSteps(SQueryRuntimeEnv *pRuntimeEnv, int
 }
 
 static int32_t tableApplyFunctionsOnBlock(SQueryRuntimeEnv *pRuntimeEnv, SDataBlockInfo *pDataBlockInfo,
-                                          SDataStatis *pStatis, __block_search_fn_t searchFn, int32_t *numOfRes,
-                                          SWindowResInfo *pWindowResInfo, SArray *pDataBlock) {
+                                          SDataStatis *pStatis, __block_search_fn_t searchFn, SWindowResInfo *pWindowResInfo, SArray *pDataBlock) {
 
   SQuery *pQuery = pRuntimeEnv->pQuery;
+  
   if (pQuery->numOfFilterCols > 0 || pRuntimeEnv->pTSBuf != NULL || isGroupbyNormalCol(pQuery->pGroupbyExpr)) {
-    *numOfRes = rowwiseApplyAllFunctions(pRuntimeEnv, pStatis, pDataBlockInfo, pWindowResInfo, pDataBlock);
+    /*numOfRes = */rowwiseApplyAllFunctions(pRuntimeEnv, pStatis, pDataBlockInfo, pWindowResInfo, pDataBlock);
   } else {
-    *numOfRes = blockwiseApplyAllFunctions(pRuntimeEnv, pStatis, pDataBlockInfo, pWindowResInfo, searchFn, pDataBlock);
+    blockwiseApplyAllFunctions(pRuntimeEnv, pStatis, pDataBlockInfo, pWindowResInfo, searchFn, pDataBlock);
   }
   
-  TSKEY lastKey = QUERY_IS_ASC_QUERY(pQuery) ? pDataBlockInfo->window.ekey : pDataBlockInfo->window.skey;
+  TSKEY lastKey = QUERY_IS_ASC_QUERY(pQuery)? pDataBlockInfo->window.ekey : pDataBlockInfo->window.skey;
   pQuery->lastKey = lastKey + GET_FORWARD_DIRECTION_FACTOR(pQuery->order.order);
 
   doCheckQueryCompleted(pRuntimeEnv, lastKey, pWindowResInfo);
@@ -1338,14 +1321,19 @@ static int32_t tableApplyFunctionsOnBlock(SQueryRuntimeEnv *pRuntimeEnv, SDataBl
     setQueryStatus(pQuery, QUERY_COMPLETED);
   }
 
-  assert(*numOfRes >= 0);
+  int32_t numOfRes = getNumOfResult(pRuntimeEnv);
 
-  // check if buffer is large enough for accommodating all qualified points
-  if (*numOfRes > 0 && pQuery->checkBufferInLoop == 1 && ((*numOfRes) >= pQuery->rec.threshold)) {
-    setQueryStatus(pQuery, QUERY_RESBUF_FULL);
+  // update the number of output result
+  if (numOfRes > 0 && pQuery->checkBuffer == 1) {
+    assert(numOfRes >= pQuery->rec.rows);
+    pQuery->rec.rows = numOfRes;
+    
+    if (numOfRes >= pQuery->rec.threshold) {
+      setQueryStatus(pQuery, QUERY_RESBUF_FULL);
+    }
   }
 
-  return 0;
+  return numOfRes;
 }
 
 void setExecParams(SQuery *pQuery, SQLFunctionCtx *pCtx, void *inputData, TSKEY *tsCol, int32_t size,
@@ -1449,8 +1437,7 @@ static void setWindowResultInfo(SResultInfo *pResultInfo, SQuery *pQuery, bool i
   }
 }
 
-static int32_t setupQueryRuntimeEnv(SQueryRuntimeEnv *pRuntimeEnv, SColumnModel *pTagsSchema, int16_t order,
-                                    bool isSTableQuery) {
+static int32_t setupQueryRuntimeEnv(SQueryRuntimeEnv *pRuntimeEnv, SColumnModel *pTagsSchema, int16_t order) {
   dTrace("QInfo:%p setup runtime env", GET_QINFO_ADDR(pRuntimeEnv));
   SQuery *pQuery = pRuntimeEnv->pQuery;
 
@@ -1464,7 +1451,6 @@ static int32_t setupQueryRuntimeEnv(SQueryRuntimeEnv *pRuntimeEnv, SColumnModel
   pRuntimeEnv->offset[0] = 0;
   for (int32_t i = 0; i < pQuery->numOfOutputCols; ++i) {
     SSqlFuncExprMsg *pSqlFuncMsg = &pQuery->pSelectExpr[i].pBase;
-//    SColIndexEx *    pColIndexEx = &pSqlFuncMsg->colInfo;
 
     SQLFunctionCtx *pCtx = &pRuntimeEnv->pCtx[i];
     pCtx->inputType = GET_COLUMN_TYPE(pQuery, i);
@@ -1510,10 +1496,10 @@ static int32_t setupQueryRuntimeEnv(SQueryRuntimeEnv *pRuntimeEnv, SColumnModel
   }
 
   // set the intermediate result output buffer
-  setWindowResultInfo(pRuntimeEnv->resultInfo, pQuery, isSTableQuery);
+  setWindowResultInfo(pRuntimeEnv->resultInfo, pQuery, pRuntimeEnv->stableQuery);
 
   // if it is group by normal column, do not set output buffer, the output buffer is pResult
-  if (!isGroupbyNormalCol(pQuery->pGroupbyExpr) && !isSTableQuery) {
+  if (!isGroupbyNormalCol(pQuery->pGroupbyExpr) && !pRuntimeEnv->stableQuery) {
     resetCtxOutputBuf(pRuntimeEnv);
   }
 
@@ -1605,7 +1591,7 @@ bool isFixedOutputQuery(SQuery *pQuery) {
 
     // ignore the ts_comp function
     if (i == 0 && pExprMsg->functionId == TSDB_FUNC_PRJ && pExprMsg->numOfParams == 1 &&
-        pExprMsg->colInfo.colIdx == PRIMARYKEY_TIMESTAMP_COL_INDEX) {
+        pExprMsg->colInfo.colIndex == PRIMARYKEY_TIMESTAMP_COL_INDEX) {
       continue;
     }
 
@@ -1682,7 +1668,7 @@ static bool needReverseScan(SQuery *pQuery) {
 }
 /////////////////////////////////////////////////////////////////////////////////////////////
 
-void doGetAlignedIntervalQueryRangeImpl(SQuery *pQuery, int64_t key, int64_t keyFirst, int64_t keyLast,
+void getAlignQueryTimeWindow(SQuery *pQuery, int64_t key, int64_t keyFirst, int64_t keyLast,
                                         int64_t *realSkey, int64_t *realEkey, STimeWindow *win) {
   assert(key >= keyFirst && key <= keyLast && pQuery->slidingTime <= pQuery->intervalTime);
 
@@ -1834,9 +1820,9 @@ bool normalizeUnBoundLastRowQuery(SQInfo *pQInfo, SPointInterpoSupporter *pPoint
 
 static void setScanLimitationByResultBuffer(SQuery *pQuery) {
   if (isTopBottomQuery(pQuery)) {
-    pQuery->checkBufferInLoop = 0;
+    pQuery->checkBuffer = 0;
   } else if (isGroupbyNormalCol(pQuery->pGroupbyExpr)) {
-    pQuery->checkBufferInLoop = 0;
+    pQuery->checkBuffer = 0;
   } else {
     bool hasMultioutput = false;
     for (int32_t i = 0; i < pQuery->numOfOutputCols; ++i) {
@@ -1851,7 +1837,7 @@ static void setScanLimitationByResultBuffer(SQuery *pQuery) {
       }
     }
 
-    pQuery->checkBufferInLoop = hasMultioutput ? 1 : 0;
+    pQuery->checkBuffer = hasMultioutput ? 1 : 0;
   }
 }
 
@@ -1901,9 +1887,9 @@ static void changeExecuteScanOrder(SQuery *pQuery, bool metricQuery) {
   // descending order query for last_row query
   if (isFirstLastRowQuery(pQuery)) {
     dTrace("QInfo:%p scan order changed for last_row query, old:%d, new:%d", GET_QINFO_ADDR(pQuery),
-           pQuery->order.order, TSQL_SO_DESC);
+           pQuery->order.order, TSDB_ORDER_DESC);
 
-    pQuery->order.order = TSQL_SO_DESC;
+    pQuery->order.order = TSDB_ORDER_DESC;
 
     int64_t skey = MIN(pQuery->window.skey, pQuery->window.ekey);
     int64_t ekey = MAX(pQuery->window.skey, pQuery->window.ekey);
@@ -1916,56 +1902,56 @@ static void changeExecuteScanOrder(SQuery *pQuery, bool metricQuery) {
 
   if (isPointInterpoQuery(pQuery) && pQuery->intervalTime == 0) {
     if (!QUERY_IS_ASC_QUERY(pQuery)) {
-      dTrace(msg, GET_QINFO_ADDR(pQuery), "interp", pQuery->order.order, TSQL_SO_ASC, pQuery->window.skey,
+      dTrace(msg, GET_QINFO_ADDR(pQuery), "interp", pQuery->order.order, TSDB_ORDER_ASC, pQuery->window.skey,
              pQuery->window.ekey, pQuery->window.ekey, pQuery->window.skey);
       SWAP(pQuery->window.skey, pQuery->window.ekey, TSKEY);
     }
 
-    pQuery->order.order = TSQL_SO_ASC;
+    pQuery->order.order = TSDB_ORDER_ASC;
     return;
   }
 
   if (pQuery->intervalTime == 0) {
     if (onlyFirstQuery(pQuery)) {
       if (!QUERY_IS_ASC_QUERY(pQuery)) {
-        dTrace(msg, GET_QINFO_ADDR(pQuery), "only-first", pQuery->order.order, TSQL_SO_ASC, pQuery->window.skey,
+        dTrace(msg, GET_QINFO_ADDR(pQuery), "only-first", pQuery->order.order, TSDB_ORDER_ASC, pQuery->window.skey,
                pQuery->window.ekey, pQuery->window.ekey, pQuery->window.skey);
 
         SWAP(pQuery->window.skey, pQuery->window.ekey, TSKEY);
       }
 
-      pQuery->order.order = TSQL_SO_ASC;
+      pQuery->order.order = TSDB_ORDER_ASC;
     } else if (onlyLastQuery(pQuery)) {
       if (QUERY_IS_ASC_QUERY(pQuery)) {
-        dTrace(msg, GET_QINFO_ADDR(pQuery), "only-last", pQuery->order.order, TSQL_SO_DESC, pQuery->window.skey,
+        dTrace(msg, GET_QINFO_ADDR(pQuery), "only-last", pQuery->order.order, TSDB_ORDER_DESC, pQuery->window.skey,
                pQuery->window.ekey, pQuery->window.ekey, pQuery->window.skey);
 
         SWAP(pQuery->window.skey, pQuery->window.ekey, TSKEY);
       }
 
-      pQuery->order.order = TSQL_SO_DESC;
+      pQuery->order.order = TSDB_ORDER_DESC;
     }
 
   } else {  // interval query
     if (metricQuery) {
       if (onlyFirstQuery(pQuery)) {
         if (!QUERY_IS_ASC_QUERY(pQuery)) {
-          dTrace(msg, GET_QINFO_ADDR(pQuery), "only-first stable", pQuery->order.order, TSQL_SO_ASC,
+          dTrace(msg, GET_QINFO_ADDR(pQuery), "only-first stable", pQuery->order.order, TSDB_ORDER_ASC,
                  pQuery->window.skey, pQuery->window.ekey, pQuery->window.ekey, pQuery->window.skey);
 
           SWAP(pQuery->window.skey, pQuery->window.ekey, TSKEY);
         }
 
-        pQuery->order.order = TSQL_SO_ASC;
+        pQuery->order.order = TSDB_ORDER_ASC;
       } else if (onlyLastQuery(pQuery)) {
         if (QUERY_IS_ASC_QUERY(pQuery)) {
-          dTrace(msg, GET_QINFO_ADDR(pQuery), "only-last stable", pQuery->order.order, TSQL_SO_DESC,
+          dTrace(msg, GET_QINFO_ADDR(pQuery), "only-last stable", pQuery->order.order, TSDB_ORDER_DESC,
                  pQuery->window.skey, pQuery->window.ekey, pQuery->window.ekey, pQuery->window.skey);
 
           SWAP(pQuery->window.skey, pQuery->window.ekey, TSKEY);
         }
 
-        pQuery->order.order = TSQL_SO_DESC;
+        pQuery->order.order = TSDB_ORDER_DESC;
       }
     }
   }
@@ -2103,8 +2089,7 @@ void pointInterpSupporterSetData(SQInfo *pQInfo, SPointInterpoSupporter *pPointI
           continue;
         }
 
-        int32_t colInBuf = pQuery->pSelectExpr[i].pBase.colInfo.colIdxInBuf;
-
+        int32_t colInBuf = 0;//pQuery->pSelectExpr[i].pBase.colInfo.colIdxInBuf;
         SInterpInfo *pInterpInfo = (SInterpInfo *)pRuntimeEnv->pCtx[i].aOutputBuf;
 
         pInterpInfo->pInterpDetail = calloc(1, sizeof(SInterpInfoDetail));
@@ -2275,12 +2260,12 @@ int32_t vnodeSTableQueryPrepare(SQInfo *pQInfo, SQuery *pQuery, void *param) {
 
   // set the ts-comp file traverse order
   if (param != NULL) {
-    int16_t order = (pQuery->order.order == pRuntimeEnv->pTSBuf->tsOrder) ? TSQL_SO_ASC : TSQL_SO_DESC;
+    int16_t order = (pQuery->order.order == pRuntimeEnv->pTSBuf->tsOrder) ? TSDB_ORDER_ASC : TSDB_ORDER_DESC;
     tsBufSetTraverseOrder(pRuntimeEnv->pTSBuf, order);
   }
 
   assert(0);
-  //  int32_t ret = setupQueryRuntimeEnv(pMeter, pQuery, &pQInfo->runtimeEnv, pTagSchemaInfo, TSQL_SO_ASC, true);
+  //  int32_t ret = setupQueryRuntimeEnv(pMeter, pQuery, &pQInfo->runtimeEnv, pTagSchemaInfo, TSDB_ORDER_ASC, true);
   //  if (ret != TSDB_CODE_SUCCESS) {
   //    return ret;
   //  }
@@ -2402,7 +2387,7 @@ static bool needToLoadDataBlock(SQuery *pQuery, SDataStatis *pDataStatis, SQLFun
 #if 0
   for (int32_t k = 0; k < pQuery->numOfFilterCols; ++k) {
     SSingleColumnFilterInfo *pFilterInfo = &pQuery->pFilterInfo[k];
-    int32_t                  colIndex = pFilterInfo->info.colIdx;
+    int32_t                  colIndex = pFilterInfo->info.colIndex;
     
     // this column not valid in current data block
     if (colIndex < 0 || pDataStatis[colIndex].colId != pFilterInfo->info.data.colId) {
@@ -2480,7 +2465,7 @@ SArray *loadDataBlockOnDemand(SQueryRuntimeEnv *pRuntimeEnv, SDataBlockInfo *pBl
 
   if (r == BLK_DATA_NO_NEEDED) {
     qTrace("QInfo:%p slot:%d, data block ignored, brange:%" PRId64 "-%" PRId64 ", rows:%d",
-          GET_QINFO_ADDR(pRuntimeEnv), pBlockInfo->window.skey, pBlockInfo->window.ekey, pBlockInfo->size);
+          GET_QINFO_ADDR(pRuntimeEnv), pBlockInfo->window.skey, pBlockInfo->window.ekey, pBlockInfo->rows);
   } else if (r == BLK_DATA_FILEDS_NEEDED) {
     if (tsdbRetrieveDataBlockStatisInfo(pRuntimeEnv->pQueryHandle, pStatis) != TSDB_CODE_SUCCESS) {
       //        return DISK_DATA_LOAD_FAILED;
@@ -2500,7 +2485,7 @@ SArray *loadDataBlockOnDemand(SQueryRuntimeEnv *pRuntimeEnv, SDataBlockInfo *pBl
      * filter the data block according to the value filter condition.
      * no need to load the data block, continue for next block
      */
-    if (!needToLoadDataBlock(pQuery, *pStatis, pRuntimeEnv->pCtx, pBlockInfo->size)) {
+    if (!needToLoadDataBlock(pQuery, *pStatis, pRuntimeEnv->pCtx, pBlockInfo->rows)) {
 #if defined(_DEBUG_VIEW)
       dTrace("QInfo:%p fileId:%d, slot:%d, block discarded by per-filter", GET_QINFO_ADDR(pQuery), pQuery->fileId,
              pQuery->slot);
@@ -2576,8 +2561,6 @@ int32_t binarySearchForKey(char *pValue, int num, TSKEY key, int order) {
 
 static int64_t doScanAllDataBlocks(SQueryRuntimeEnv *pRuntimeEnv) {
   SQuery *pQuery = pRuntimeEnv->pQuery;
-  int64_t cnt = 0;
-
   dTrace("QInfo:%p query start, qrange:%" PRId64 "-%" PRId64 ", lastkey:%" PRId64 ", order:%d",
          GET_QINFO_ADDR(pRuntimeEnv), pQuery->window.skey, pQuery->window.ekey, pQuery->lastKey, pQuery->order.order);
 
@@ -2585,43 +2568,66 @@ static int64_t doScanAllDataBlocks(SQueryRuntimeEnv *pRuntimeEnv) {
   while (tsdbNextDataBlock(pQueryHandle)) {
     // check if query is killed or not set the status of query to pass the status check
     if (isQueryKilled(GET_QINFO_ADDR(pRuntimeEnv))) {
-      return cnt;
+      return 0;
     }
 
     SDataBlockInfo blockInfo = tsdbRetrieveDataBlockInfo(pQueryHandle);
 
+    // todo extract methods
     if (isIntervalQuery(pQuery) && pRuntimeEnv->windowResInfo.prevSKey == 0) {
-      TSKEY           skey1, ekey1;
-      STimeWindow     w = {0};
+      TSKEY skey1, ekey1;
+      STimeWindow w = {0};
       SWindowResInfo *pWindowResInfo = &pRuntimeEnv->windowResInfo;
 
       if (QUERY_IS_ASC_QUERY(pQuery)) {
-        doGetAlignedIntervalQueryRangeImpl(pQuery, blockInfo.window.skey, blockInfo.window.skey, pQuery->window.ekey,
+        getAlignQueryTimeWindow(pQuery, blockInfo.window.skey, blockInfo.window.skey, pQuery->window.ekey,
                                            &skey1, &ekey1, &w);
         pWindowResInfo->startTime = w.skey;
         pWindowResInfo->prevSKey = w.skey;
       } else {
         // the start position of the first time window in the endpoint that spreads beyond the queried last timestamp
-        TSKEY winStart = blockInfo.window.ekey - pQuery->intervalTime;
-        doGetAlignedIntervalQueryRangeImpl(pQuery, winStart, pQuery->window.ekey, blockInfo.window.ekey, &skey1, &ekey1,
-                                           &w);
+        TSKEY start = blockInfo.window.ekey - pQuery->intervalTime;
+        getAlignQueryTimeWindow(pQuery, start, pQuery->window.ekey, blockInfo.window.ekey, &skey1, &ekey1, &w);
 
         pWindowResInfo->startTime = pQuery->window.skey;
         pWindowResInfo->prevSKey = w.skey;
       }
     }
+    
+    // in case of prj/diff query, ensure the output buffer is sufficient to accomodate the results of current block
+    if (!isIntervalQuery(pQuery) && !isGroupbyNormalCol(pQuery->pGroupbyExpr) && !isFixedOutputQuery(pQuery)) {
+      SResultRec* pRec = &pQuery->rec;
+      
+      if (pQuery->rec.capacity - pQuery->rec.rows < blockInfo.rows) {
+        int32_t remain = pRec->capacity - pRec->rows;
+        int32_t newSize = pRec->capacity + (blockInfo.rows - remain);
+        
+        for(int32_t i = 0; i < pQuery->numOfOutputCols; ++i) {
+          int32_t bytes = pQuery->pSelectExpr[i].resBytes;
+          
+          char* tmp = realloc(pQuery->sdata[i], bytes * newSize + sizeof(SData));
+          if (tmp == NULL) { // todo handle the oom
+          } else {
+            pQuery->sdata[i] = (SData*) tmp;
+          }
+          
+          // set the pCtx output buffer position
+          pRuntimeEnv->pCtx[i].aOutputBuf = pQuery->sdata[i]->data + pRec->rows*bytes;
+        }
+        
+        pRec->capacity = newSize;
+      }
+    }
 
-    int32_t numOfRes = 0;
     SDataStatis *pStatis = NULL;
     SArray *pDataBlock = loadDataBlockOnDemand(pRuntimeEnv, &blockInfo, &pStatis);
-    int32_t forwardStep = tableApplyFunctionsOnBlock(pRuntimeEnv, &blockInfo, pStatis, binarySearchForKey, &numOfRes,
+    int32_t numOfRes = tableApplyFunctionsOnBlock(pRuntimeEnv, &blockInfo, pStatis, binarySearchForKey,
                                                      &pRuntimeEnv->windowResInfo, pDataBlock);
 
-    dTrace("QInfo:%p check data block, brange:%" PRId64 "-%" PRId64 ", rows:%d",
-               GET_QINFO_ADDR(pRuntimeEnv), blockInfo.window.skey, blockInfo.window.ekey, blockInfo.size);
+    dTrace("QInfo:%p check data block, brange:%" PRId64 "-%" PRId64 ", rows:%d, res:%d",
+               GET_QINFO_ADDR(pRuntimeEnv), blockInfo.window.skey, blockInfo.window.ekey, blockInfo.rows, numOfRes);
 
     // save last access position
-    cnt += forwardStep;
     if (Q_STATUS_EQUAL(pQuery->status, QUERY_RESBUF_FULL)) {
       break;
     }
@@ -2644,7 +2650,7 @@ static int64_t doScanAllDataBlocks(SQueryRuntimeEnv *pRuntimeEnv) {
     }
   }
 
-  return cnt;
+  return 0;
 }
 
 static void updatelastkey(SQuery *pQuery, STableQueryInfo *pTableQInfo) { pTableQInfo->lastKey = pQuery->lastKey; }
@@ -2682,19 +2688,19 @@ void vnodeSetTagValueInParam(tSidSet *pSidSet, SQueryRuntimeEnv *pRuntimeEnv, vo
   } else {
     // set tag value, by which the results are aggregated.
     for (int32_t idx = 0; idx < pQuery->numOfOutputCols; ++idx) {
-      SColIndexEx *pColEx = &pQuery->pSelectExpr[idx].pBase.colInfo;
+      SColIndex *pColEx = &pQuery->pSelectExpr[idx].pBase.colInfo;
 
       // ts_comp column required the tag value for join filter
       if (!TSDB_COL_IS_TAG(pColEx->flag)) {
         continue;
       }
 
-      doSetTagValueInParam(pTagSchema, pColEx->colIdx, pMeterSidInfo, &pRuntimeEnv->pCtx[idx].tag);
+      doSetTagValueInParam(pTagSchema, pColEx->colIndex, pMeterSidInfo, &pRuntimeEnv->pCtx[idx].tag);
     }
 
     // set the join tag for first column
     SSqlFuncExprMsg *pFuncMsg = &pQuery->pSelectExpr[0].pBase;
-    if (pFuncMsg->functionId == TSDB_FUNC_TS && pFuncMsg->colInfo.colIdx == PRIMARYKEY_TIMESTAMP_COL_INDEX &&
+    if (pFuncMsg->functionId == TSDB_FUNC_TS && pFuncMsg->colInfo.colIndex == PRIMARYKEY_TIMESTAMP_COL_INDEX &&
         pRuntimeEnv->pTSBuf != NULL) {
       assert(pFuncMsg->numOfParams == 1);
       doSetTagValueInParam(pTagSchema, pFuncMsg->arg->argValue.i64, pMeterSidInfo, &pRuntimeEnv->pCtx[0].tag);
@@ -2821,13 +2827,13 @@ void UNUSED_FUNC displayInterResult(SData **pdata, SQuery *pQuery, int32_t numOf
     for (int32_t i = 0; i < numOfCols; ++i) {
       switch (pQuery->pSelectExpr[i].resType) {
         case TSDB_DATA_TYPE_BINARY: {
-          int32_t colIdx = pQuery->pSelectExpr[i].pBase.colInfo.colIdx;
+          int32_t colIndex = pQuery->pSelectExpr[i].pBase.colInfo.colIndex;
           int32_t type = 0;
           
           if (TSDB_COL_IS_TAG(pQuery->pSelectExpr[i].pBase.colInfo.flag)) {
             type = pQuery->pSelectExpr[i].resType;
           } else {
-            type = pMeterObj->schema[colIdx].type;
+            type = pMeterObj->schema[colIndex].type;
           }
           printBinaryData(pQuery->pSelectExpr[i].pBase.functionId, pdata[i]->data + pQuery->pSelectExpr[i].resBytes * j,
                           type);
@@ -2978,9 +2984,9 @@ void copyResToQueryResultBuf(SQInfo *pQInfo, SQuery *pQuery) {
     offset += pData->numOfElems;
   }
 
-  assert(pQuery->rec.size == 0);
+  assert(pQuery->rec.rows == 0);
 
-  pQuery->rec.size += rows;
+  pQuery->rec.rows += rows;
   pQInfo->offset += 1;
 }
 
@@ -3206,8 +3212,8 @@ static void doDisableFunctsForSupplementaryScan(SQuery *pQuery, SWindowResInfo *
     for (int32_t j = 0; j < pQuery->numOfOutputCols; ++j) {
       int32_t functId = pQuery->pSelectExpr[j].pBase.functionId;
 
-      if (((functId == TSDB_FUNC_FIRST || functId == TSDB_FUNC_FIRST_DST) && order == TSQL_SO_DESC) ||
-          ((functId == TSDB_FUNC_LAST || functId == TSDB_FUNC_LAST_DST) && order == TSQL_SO_ASC)) {
+      if (((functId == TSDB_FUNC_FIRST || functId == TSDB_FUNC_FIRST_DST) && order == TSDB_ORDER_DESC) ||
+          ((functId == TSDB_FUNC_LAST || functId == TSDB_FUNC_LAST_DST) && order == TSDB_ORDER_ASC)) {
         buf->resultInfo[j].complete = false;
       } else if (functId != TSDB_FUNC_TS && functId != TSDB_FUNC_TAG) {
         buf->resultInfo[j].complete = true;
@@ -3232,8 +3238,8 @@ void disableFunctForTableSuppleScan(SQueryRuntimeEnv *pRuntimeEnv, int32_t order
       int32_t         functId = pQuery->pSelectExpr[j].pBase.functionId;
       SQLFunctionCtx *pCtx = &pRuntimeEnv->pCtx[j];
 
-      if (((functId == TSDB_FUNC_FIRST || functId == TSDB_FUNC_FIRST_DST) && order == TSQL_SO_DESC) ||
-          ((functId == TSDB_FUNC_LAST || functId == TSDB_FUNC_LAST_DST) && order == TSQL_SO_ASC)) {
+      if (((functId == TSDB_FUNC_FIRST || functId == TSDB_FUNC_FIRST_DST) && order == TSDB_ORDER_DESC) ||
+          ((functId == TSDB_FUNC_LAST || functId == TSDB_FUNC_LAST_DST) && order == TSDB_ORDER_ASC)) {
         pCtx->resultInfo->complete = false;
       } else if (functId != TSDB_FUNC_TS && functId != TSDB_FUNC_TAG) {
         pCtx->resultInfo->complete = true;
@@ -3309,7 +3315,7 @@ void resetCtxOutputBuf(SQueryRuntimeEnv *pRuntimeEnv) {
       pCtx->ptsOutputBuf = pRuntimeEnv->pCtx[0].aOutputBuf;
     }
 
-    memset(pQuery->sdata[i]->data, 0, (size_t)pQuery->pSelectExpr[i].resBytes * pQuery->rec.capacity);
+    memset(pQuery->sdata[i]->data, 0, (size_t) pQuery->pSelectExpr[i].resBytes * pQuery->rec.capacity);
   }
 
   initCtxOutputBuf(pRuntimeEnv);
@@ -3348,22 +3354,22 @@ void initCtxOutputBuf(SQueryRuntimeEnv *pRuntimeEnv) {
 
   for (int32_t j = 0; j < pQuery->numOfOutputCols; ++j) {
     int32_t functionId = pQuery->pSelectExpr[j].pBase.functionId;
+    
     pRuntimeEnv->pCtx[j].currentStage = 0;
-
     aAggs[functionId].init(&pRuntimeEnv->pCtx[j]);
   }
 }
 
 void doSkipResults(SQueryRuntimeEnv *pRuntimeEnv) {
   SQuery *pQuery = pRuntimeEnv->pQuery;
-  if (pQuery->rec.size == 0 || pQuery->limit.offset == 0) {
+  if (pQuery->rec.rows == 0 || pQuery->limit.offset == 0) {
     return;
   }
 
-  if (pQuery->rec.size <= pQuery->limit.offset) {
-    pQuery->limit.offset -= pQuery->rec.size;
+  if (pQuery->rec.rows <= pQuery->limit.offset) {
+    pQuery->limit.offset -= pQuery->rec.rows;
 
-    pQuery->rec.size = 0;
+    pQuery->rec.rows = 0;
     //    pQuery->pointsOffset = pQuery->rec.pointsToRead;  // clear all data in result buffer
 
     resetCtxOutputBuf(pRuntimeEnv);
@@ -3372,7 +3378,7 @@ void doSkipResults(SQueryRuntimeEnv *pRuntimeEnv) {
     pQuery->status &= (~QUERY_RESBUF_FULL);
   } else {
     int32_t numOfSkip = (int32_t)pQuery->limit.offset;
-    pQuery->rec.size -= numOfSkip;
+    pQuery->rec.rows -= numOfSkip;
 
     for (int32_t i = 0; i < pQuery->numOfOutputCols; ++i) {
       int32_t functionId = pQuery->pSelectExpr[i].pBase.functionId;
@@ -3527,6 +3533,7 @@ void scanAllDataBlocks(SQueryRuntimeEnv *pRuntimeEnv) {
     doScanAllDataBlocks(pRuntimeEnv);
 
     if (!needScanDataBlocksAgain(pRuntimeEnv)) {
+      
       // restore the status
       if (pRuntimeEnv->scanFlag == REPEAT_SCAN) {
         pQuery->status = status;
@@ -3546,7 +3553,6 @@ void scanAllDataBlocks(SQueryRuntimeEnv *pRuntimeEnv) {
 
     /* check if query is killed or not */
     if (isQueryKilled(GET_QINFO_ADDR(pRuntimeEnv))) {
-//      setQueryStatus(pQuery, QUERY_NO_DATA_TO_CHECK);
       return;
     }
   }
@@ -3677,7 +3683,7 @@ void restoreIntervalQueryRange(SQueryRuntimeEnv *pRuntimeEnv, STableQueryInfo *p
 /**
  * set output buffer for different group
  * @param pRuntimeEnv
- * @param pDataBlockInfoEx
+ * @param pDataBlockInfo
  */
 void setExecutionContext(SQInfo *pQInfo, STableQueryInfo *pTableQueryInfo, int32_t meterIdx, int32_t groupIdx,
                          TSKEY nextKey) {
@@ -3792,7 +3798,7 @@ void setIntervalQueryRange(STableQueryInfo *pTableQueryInfo, SQInfo *pQInfo, TSK
     STimeWindow     w = {0};
     SWindowResInfo *pWindowResInfo = &pTableQueryInfo->windowResInfo;
 
-    doGetAlignedIntervalQueryRangeImpl(pQuery, win.skey, win.skey, win.ekey, &skey1, &ekey1, &w);
+    getAlignQueryTimeWindow(pQuery, win.skey, win.skey, win.ekey, &skey1, &ekey1, &w);
     pWindowResInfo->startTime = pQuery->window.skey;  // windowSKey may be 0 in case of 1970 timestamp
 
     if (pWindowResInfo->prevSKey == 0) {
@@ -3862,7 +3868,7 @@ static int32_t doCopyToSData(SQInfo *pQInfo, SWindowResult *result, int32_t orde
   dTrace("QInfo:%p start to copy data from windowResInfo to pQuery buf", GET_QINFO_ADDR(pQuery));
   int32_t totalSubset = getNumOfSubset(pQInfo);
 
-  if (orderType == TSQL_SO_ASC) {
+  if (orderType == TSDB_ORDER_ASC) {
     startIdx = pQInfo->subgroupIdx;
     step = 1;
   } else {  // desc order copy all data
@@ -3928,12 +3934,12 @@ static int32_t doCopyToSData(SQInfo *pQInfo, SWindowResult *result, int32_t orde
 void copyFromWindowResToSData(SQInfo *pQInfo, SWindowResult *result) {
   SQuery *pQuery = pQInfo->runtimeEnv.pQuery;
 
-  int32_t orderType = (pQuery->pGroupbyExpr != NULL) ? pQuery->pGroupbyExpr->orderType : TSQL_SO_ASC;
+  int32_t orderType = (pQuery->pGroupbyExpr != NULL) ? pQuery->pGroupbyExpr->orderType : TSDB_ORDER_ASC;
   int32_t numOfResult = doCopyToSData(pQInfo, result, orderType);
 
-  pQuery->rec.size += numOfResult;
+  pQuery->rec.rows += numOfResult;
   
-  assert(pQuery->rec.size <= pQuery->rec.capacity);
+  assert(pQuery->rec.rows <= pQuery->rec.capacity);
 }
 
 static void updateWindowResNumOfRes(SQueryRuntimeEnv *pRuntimeEnv, STableDataInfo *pTableDataInfo) {
@@ -3957,15 +3963,12 @@ void stableApplyFunctionsOnBlock(SQueryRuntimeEnv* pRuntimeEnv, STableDataInfo *
   STableQueryInfo * pTableQueryInfo = pTableDataInfo->pTableQInfo;
   SWindowResInfo *  pWindowResInfo = &pTableQueryInfo->windowResInfo;
 
-  int32_t numOfRes = 0;
   if (pQuery->numOfFilterCols > 0 || pRuntimeEnv->pTSBuf != NULL) {
     //    numOfRes = rowwiseApplyAllFunctions(pRuntimeEnv, &forwardStep, pFields, pDataBlockInfo, pWindowResInfo);
   } else {
-    numOfRes = blockwiseApplyAllFunctions(pRuntimeEnv, pStatis, pDataBlockInfo, pWindowResInfo, searchFn, pDataBlock);
+    blockwiseApplyAllFunctions(pRuntimeEnv, pStatis, pDataBlockInfo, pWindowResInfo, searchFn, pDataBlock);
   }
 
-  assert(numOfRes >= 0);
-
   updateWindowResNumOfRes(pRuntimeEnv, pTableDataInfo);
   updatelastkey(pQuery, pTableQueryInfo);
 }
@@ -3981,7 +3984,7 @@ bool vnodeHasRemainResults(void *handle) {
   SQuery *          pQuery = pRuntimeEnv->pQuery;
 
   SInterpolationInfo *pInterpoInfo = &pRuntimeEnv->interpoInfo;
-  if (pQuery->limit.limit > 0 && pQuery->rec.size >= pQuery->limit.limit) {
+  if (pQuery->limit.limit > 0 && pQuery->rec.rows >= pQuery->limit.limit) {
     return false;
   }
 
@@ -4152,7 +4155,7 @@ void vnodePrintQueryStatistics(SQInfo *pQInfo) {
 #endif
 }
 
-int32_t doInitializeQInfo(SQInfo *pQInfo, void *param, void* tsdb, bool isSTableQuery) {
+int32_t doInitQInfo(SQInfo *pQInfo, void *param, void* tsdb, bool isSTableQuery) {
   SQueryRuntimeEnv *pRuntimeEnv = &pQInfo->runtimeEnv;
   
   SQuery *pQuery = pQInfo->runtimeEnv.pQuery;
@@ -4181,13 +4184,15 @@ int32_t doInitializeQInfo(SQInfo *pQInfo, void *param, void* tsdb, bool isSTable
   pRuntimeEnv->pQuery = pQuery;
   pRuntimeEnv->pTSBuf = param;
   pRuntimeEnv->cur.vnodeIndex = -1;
+  pRuntimeEnv->stableQuery = isSTableQuery;
+  
   if (param != NULL) {
-    int16_t order = (pQuery->order.order == pRuntimeEnv->pTSBuf->tsOrder) ? TSQL_SO_ASC : TSQL_SO_DESC;
+    int16_t order = (pQuery->order.order == pRuntimeEnv->pTSBuf->tsOrder) ? TSDB_ORDER_ASC : TSDB_ORDER_DESC;
     tsBufSetTraverseOrder(pRuntimeEnv->pTSBuf, order);
   }
 
   // create runtime environment
-  code = setupQueryRuntimeEnv(pRuntimeEnv, NULL, pQuery->order.order, isSTableQuery);
+  code = setupQueryRuntimeEnv(pRuntimeEnv, NULL, pQuery->order.order);
   if (code != TSDB_CODE_SUCCESS) {
     return code;
   }
@@ -4270,8 +4275,6 @@ int32_t doInitializeQInfo(SQInfo *pQInfo, void *param, void* tsdb, bool isSTable
 
   // the pQuery->window.skey is changed during normalizedFirstQueryRange, so set the newest lastkey value
   pQuery->lastKey = pQuery->window.skey;
-  pRuntimeEnv->stableQuery = false;
-
   return TSDB_CODE_SUCCESS;
 }
 
@@ -4281,7 +4284,7 @@ static UNUSED_FUNC bool isGroupbyEachTable(SSqlGroupbyExpr *pGroupbyExpr, tSidSe
   }
 
   for (int32_t i = 0; i < pGroupbyExpr->numOfGroupCols; ++i) {
-    SColIndexEx *pColIndex = &pGroupbyExpr->columnInfo[i];
+    SColIndex *pColIndex = &pGroupbyExpr->columnInfo[i];
     if (pColIndex->flag == TSDB_COL_TAG) {
       //      assert(pSidset->numOfTables == pSidset->numOfSubSet);
       return true;
@@ -4454,7 +4457,7 @@ static UNUSED_FUNC int64_t doCheckMetersInGroup(SQInfo *pQInfo, int32_t index, i
 
   // accumulate the point interpolation result
   if (numOfRes > 0) {
-    pQuery->rec.size += numOfRes;
+    pQuery->rec.rows += numOfRes;
     forwardCtxOutputBuf(pRuntimeEnv, numOfRes);
   }
 
@@ -4821,13 +4824,13 @@ static void multiTableQueryProcess(SQInfo *pQInfo) {
       copyFromWindowResToSData(pQInfo, pRuntimeEnv->windowResInfo.pResult);
     }
 
-    pQuery->rec.size += pQuery->rec.size;
+    pQuery->rec.rows += pQuery->rec.rows;
 
-    if (pQuery->rec.size == 0) {
+    if (pQuery->rec.rows == 0) {
       //      vnodePrintQueryStatistics(pSupporter);
     }
 
-    dTrace("QInfo:%p current:%lldd, total:%lldd", pQInfo, pQuery->rec.size, pQuery->rec.total);
+    dTrace("QInfo:%p current:%lldd, total:%lldd", pQInfo, pQuery->rec.rows, pQuery->rec.total);
     return;
   }
   
@@ -4884,7 +4887,7 @@ static void multiTableQueryProcess(SQInfo *pQInfo) {
   }
   
   // handle the limitation of output buffer
-  dTrace("QInfo:%p points returned:%d, total:%d", pQInfo, pQuery->rec.size, pQuery->rec.total);
+  dTrace("QInfo:%p points returned:%d, total:%d", pQInfo, pQuery->rec.rows, pQuery->rec.total);
 }
 
 /*
@@ -4905,7 +4908,7 @@ static void tableFixedOutputProcessor(SQInfo *pQInfo) {
   }
 
   // since the numOfOutputElems must be identical for all sql functions that are allowed to be executed simutanelously.
-  pQuery->rec.size = getNumOfResult(pRuntimeEnv);
+  pQuery->rec.rows = getNumOfResult(pRuntimeEnv);
   //  assert(pQuery->size <= pQuery->pointsToRead &&
   //         Q_STATUS_EQUAL(pQuery->over, QUERY_COMPLETED));
 
@@ -4917,12 +4920,12 @@ static void tableFixedOutputProcessor(SQInfo *pQInfo) {
   doSkipResults(pRuntimeEnv);
   doRevisedResultsByLimit(pQInfo);
 
-  pQuery->rec.size = pQuery->rec.size;
+  pQuery->rec.rows = pQuery->rec.rows;
 }
 
-static void tableMultiOutputProcessor(SQInfo *pQInfo) {
+static void tableMultiOutputProcess(SQInfo *pQInfo) {
   SQueryRuntimeEnv *pRuntimeEnv = &pQInfo->runtimeEnv;
-  SQuery *   pQuery = pRuntimeEnv->pQuery;
+  SQuery *pQuery = pRuntimeEnv->pQuery;
 
   // for ts_comp query, re-initialized is not allowed
   if (!isTSCompQuery(pQuery)) {
@@ -4937,8 +4940,8 @@ static void tableMultiOutputProcessor(SQInfo *pQInfo) {
       return;
     }
 
-    pQuery->rec.size = getNumOfResult(pRuntimeEnv);
-    if (pQuery->limit.offset > 0 && pQuery->numOfFilterCols > 0 && pQuery->rec.size > 0) {
+    pQuery->rec.rows = getNumOfResult(pRuntimeEnv);
+    if (pQuery->limit.offset > 0 && pQuery->numOfFilterCols > 0 && pQuery->rec.rows > 0) {
       doSkipResults(pRuntimeEnv);
     }
 
@@ -4946,7 +4949,7 @@ static void tableMultiOutputProcessor(SQInfo *pQInfo) {
      * 1. if pQuery->size == 0, pQuery->limit.offset >= 0, still need to check data
      * 2. if pQuery->size > 0, pQuery->limit.offset must be 0
      */
-    if (pQuery->rec.size > 0 || Q_STATUS_EQUAL(pQuery->status, QUERY_COMPLETED)) {
+    if (pQuery->rec.rows > 0 || Q_STATUS_EQUAL(pQuery->status, QUERY_COMPLETED)) {
       break;
     }
 
@@ -4958,17 +4961,16 @@ static void tableMultiOutputProcessor(SQInfo *pQInfo) {
 
   doRevisedResultsByLimit(pQInfo);
   if (Q_STATUS_EQUAL(pQuery->status, QUERY_RESBUF_FULL)) {
-    dTrace("QInfo:%p query paused due to buffer limitation, next qrange:%" PRId64 "-%" PRId64,
-           pQInfo, pQuery->lastKey, pQuery->window.ekey);
+    dTrace("QInfo:%p query paused due to output limitation, next qrange:%" PRId64 "-%" PRId64,
+        pQInfo, pQuery->lastKey, pQuery->window.ekey);
   }
 
 //  dTrace("QInfo:%p vid:%d sid:%d id:%s, %d points returned, totalRead:%d totalReturn:%d", pQInfo, pMeterObj->vnode,
 //         pMeterObj->sid, pMeterObj->meterId, pQuery->size, pQInfo->size, pQInfo->pointsReturned);
 
-//  pQuery->pointsOffset = pQuery->pointsToRead;  //restore the available buffer
-//  if (!isTSCompQuery(pQuery)) {
-//    assert(pQuery->size <= pQuery->pointsToRead);
-//  }
+  if (!isTSCompQuery(pQuery)) {
+    assert(pQuery->rec.rows <= pQuery->rec.capacity);
+  }
 }
 
 static void tableIntervalProcessImpl(SQueryRuntimeEnv *pRuntimeEnv) {
@@ -5015,7 +5017,7 @@ static void tableIntervalProcessor(SQInfo *pQInfo) {
 
     if (isIntervalQuery(pQuery)) {
       pQInfo->subgroupIdx = 0;  // always start from 0
-      pQuery->rec.size = 0;
+      pQuery->rec.rows = 0;
       copyFromWindowResToSData(pQInfo, pRuntimeEnv->windowResInfo.pResult);
 
       clearFirstNTimeWindow(pRuntimeEnv, pQInfo->subgroupIdx);
@@ -5026,37 +5028,37 @@ static void tableIntervalProcessor(SQInfo *pQInfo) {
       doRevisedResultsByLimit(pQInfo);
       break;
     } else {
-      taosInterpoSetStartInfo(&pRuntimeEnv->interpoInfo, pQuery->rec.size, pQuery->interpoType);
+      taosInterpoSetStartInfo(&pRuntimeEnv->interpoInfo, pQuery->rec.rows, pQuery->interpoType);
       SData **pInterpoBuf = pRuntimeEnv->pInterpoBuf;
 
       for (int32_t i = 0; i < pQuery->numOfOutputCols; ++i) {
-        memcpy(pInterpoBuf[i]->data, pQuery->sdata[i]->data, pQuery->rec.size * pQuery->pSelectExpr[i].resBytes);
+        memcpy(pInterpoBuf[i]->data, pQuery->sdata[i]->data, pQuery->rec.rows * pQuery->pSelectExpr[i].resBytes);
       }
 
       numOfInterpo = 0;
-      pQuery->rec.size = vnodeQueryResultInterpolate(
-          pQInfo, (tFilePage **)pQuery->sdata, (tFilePage **)pInterpoBuf, pQuery->rec.size, &numOfInterpo);
+      pQuery->rec.rows = vnodeQueryResultInterpolate(
+          pQInfo, (tFilePage **)pQuery->sdata, (tFilePage **)pInterpoBuf, pQuery->rec.rows, &numOfInterpo);
 
-      dTrace("QInfo: %p interpo completed, final:%d", pQInfo, pQuery->rec.size);
-      if (pQuery->rec.size > 0 || Q_STATUS_EQUAL(pQuery->status, QUERY_COMPLETED)) {
+      dTrace("QInfo: %p interpo completed, final:%d", pQInfo, pQuery->rec.rows);
+      if (pQuery->rec.rows > 0 || Q_STATUS_EQUAL(pQuery->status, QUERY_COMPLETED)) {
         doRevisedResultsByLimit(pQInfo);
         break;
       }
 
       // no result generated yet, continue retrieve data
-      pQuery->rec.size = 0;
+      pQuery->rec.rows = 0;
     }
   }
 
   // all data scanned, the group by normal column can return
   if (isGroupbyNormalCol(pQuery->pGroupbyExpr)) {  // todo refactor with merge interval time result
     pQInfo->subgroupIdx = 0;
-    pQuery->rec.size = 0;
+    pQuery->rec.rows = 0;
     copyFromWindowResToSData(pQInfo, pRuntimeEnv->windowResInfo.pResult);
     clearFirstNTimeWindow(pRuntimeEnv, pQInfo->subgroupIdx);
   }
 
-  pQuery->rec.size += pQuery->rec.size;
+  pQuery->rec.rows += pQuery->rec.rows;
   pQInfo->pointsInterpo += numOfInterpo;
 
   //  dTrace("%p vid:%d sid:%d id:%s, %d points returned %d points interpo, totalRead:%d totalInterpo:%d
@@ -5065,7 +5067,7 @@ static void tableIntervalProcessor(SQInfo *pQInfo) {
   //         pQInfo->size - pQInfo->pointsInterpo, pQInfo->pointsInterpo, pQInfo->pointsReturned);
 }
 
-static void singleTableQueryImpl(SQInfo* pQInfo) {
+static void tableQueryImpl(SQInfo* pQInfo) {
   SQueryRuntimeEnv* pRuntimeEnv = &pQInfo->runtimeEnv;
   SQuery* pQuery = pRuntimeEnv->pQuery;
   
@@ -5076,15 +5078,15 @@ static void singleTableQueryImpl(SQInfo* pQInfo) {
      */
     int32_t numOfInterpo = 0;
     int32_t remain = taosNumOfRemainPoints(&pRuntimeEnv->interpoInfo);
-    pQuery->rec.size = vnodeQueryResultInterpolate(pQInfo, (tFilePage **)pQuery->sdata,
+    pQuery->rec.rows = vnodeQueryResultInterpolate(pQInfo, (tFilePage **)pQuery->sdata,
                                                    (tFilePage **)pRuntimeEnv->pInterpoBuf, remain, &numOfInterpo);
     
     doRevisedResultsByLimit(pQInfo);
     
     pQInfo->pointsInterpo += numOfInterpo;
-    pQuery->rec.size += pQuery->rec.size;
+    pQuery->rec.rows += pQuery->rec.rows;
     
-    dTrace("QInfo:%p current:%d returned, total:%d", pQInfo, pQuery->rec.size, pQuery->rec.total);
+    dTrace("QInfo:%p current:%d returned, total:%d", pQInfo, pQuery->rec.rows, pQuery->rec.total);
     sem_post(&pQInfo->dataReady);
     return;
   }
@@ -5096,17 +5098,17 @@ static void singleTableQueryImpl(SQInfo* pQInfo) {
           ((isIntervalQuery(pQuery) && pQuery->rec.total < pQuery->limit.limit))) {
       
       // todo limit the output for interval query?
-      pQuery->rec.size = 0;
+      pQuery->rec.rows = 0;
       pQInfo->subgroupIdx = 0;  // always start from 0
       
       if (pRuntimeEnv->windowResInfo.size > 0) {
         copyFromWindowResToSData(pQInfo, pRuntimeEnv->windowResInfo.pResult);
-        pQuery->rec.size += pQuery->rec.size;
+        pQuery->rec.rows += pQuery->rec.rows;
         
         clearFirstNTimeWindow(pRuntimeEnv, pQInfo->subgroupIdx);
         
-        if (pQuery->rec.size > 0) {
-          dTrace("QInfo:%p %d rows returned from group results, total:%d", pQInfo, pQuery->rec.size, pQuery->rec.total);
+        if (pQuery->rec.rows > 0) {
+          dTrace("QInfo:%p %d rows returned from group results, total:%d", pQInfo, pQuery->rec.rows, pQuery->rec.total);
           sem_post(&pQInfo->dataReady);
           return;
         }
@@ -5120,23 +5122,21 @@ static void singleTableQueryImpl(SQInfo* pQInfo) {
   }
   
   // number of points returned during this query
-  pQuery->rec.size = 0;
+  pQuery->rec.rows = 0;
   int64_t st = taosGetTimestampUs();
   
   // group by normal column, sliding window query, interval query are handled by interval query processor
   if (isIntervalQuery(pQuery) || isGroupbyNormalCol(pQuery->pGroupbyExpr)) {  // interval (down sampling operation)
     tableIntervalProcessor(pQInfo);
-  } else {
-    if (isFixedOutputQuery(pQuery)) {
-      assert(pQuery->checkBufferInLoop == 0);
-      
-      tableFixedOutputProcessor(pQInfo);
-    } else {  // diff/add/multiply/subtract/division
-      assert(pQuery->checkBufferInLoop == 1);
-      tableMultiOutputProcessor(pQInfo);
-    }
+  } else if (isFixedOutputQuery(pQuery)) {
+    assert(pQuery->checkBuffer == 0);
+    tableFixedOutputProcessor(pQInfo);
+  } else {  // diff/add/multiply/subtract/division
+    assert(pQuery->checkBuffer == 1);
+    tableMultiOutputProcess(pQInfo);
   }
   
+  
   // record the total elapsed time
   pQInfo->elapsedTime += (taosGetTimestampUs() - st);
   
@@ -5144,16 +5144,16 @@ static void singleTableQueryImpl(SQInfo* pQInfo) {
   if (isQueryKilled(pQInfo)) {
     dTrace("QInfo:%p query is killed", pQInfo);
   } else {
-    dTrace("QInfo:%p query task completed, %" PRId64 " rows will returned, total:%" PRId64 " rows", pQInfo, pQuery->rec.size,
+    dTrace("QInfo:%p query task completed, %" PRId64 " rows will returned, total:%" PRId64 " rows", pQInfo, pQuery->rec.rows,
         pQuery->rec.total);
   }
   
   sem_post(&pQInfo->dataReady);
 }
 
-static void multiTableQueryImpl(SQInfo* pQInfo) {
+static void stableQueryImpl(SQInfo* pQInfo) {
   SQuery* pQuery = pQInfo->runtimeEnv.pQuery;
-  pQuery->rec.size = 0;
+  pQuery->rec.rows = 0;
   
   int64_t st = taosGetTimestampUs();
   
@@ -5161,7 +5161,7 @@ static void multiTableQueryImpl(SQInfo* pQInfo) {
       (isFixedOutputQuery(pQuery) && (!isPointInterpoQuery(pQuery)) && !isGroupbyNormalCol(pQuery->pGroupbyExpr))) {
     multiTableQueryProcess(pQInfo);
   } else {
-    assert((pQuery->checkBufferInLoop == 1 && pQuery->intervalTime == 0) || isPointInterpoQuery(pQuery) ||
+    assert((pQuery->checkBuffer == 1 && pQuery->intervalTime == 0) || isPointInterpoQuery(pQuery) ||
         isGroupbyNormalCol(pQuery->pGroupbyExpr));
     
     vnodeSTableSeqProcessor(pQInfo);
@@ -5171,7 +5171,7 @@ static void multiTableQueryImpl(SQInfo* pQInfo) {
   pQInfo->elapsedTime += (taosGetTimestampUs() - st);
 //  taosInterpoSetStartInfo(&pQInfo->runtimeEnv.interpoInfo, pQuery->size, pQInfo->query.interpoType);
   
-  if (pQuery->rec.size == 0) {
+  if (pQuery->rec.rows == 0) {
     int32_t numOfTables = taosArrayGetSize(pQInfo->pTableIdList);
     dTrace("QInfo:%p over, %d tables queried, %d points are returned", pQInfo, numOfTables, pQuery->rec.total);
 //    vnodePrintQueryStatistics(pSupporter);
@@ -5266,7 +5266,7 @@ static char* createTableIdList(SQueryTableMsg* pQueryMsg, char* pMsg, SArray** p
  * @return
  */
 static int32_t convertQueryMsg(SQueryTableMsg *pQueryMsg, SArray **pTableIdList, SSqlFuncExprMsg ***pExpr,
-      wchar_t** tagCond) {
+      char** tagCond) {
   pQueryMsg->numOfTables   = htonl(pQueryMsg->numOfTables);
 
   pQueryMsg->window.skey   = htobe64(pQueryMsg->window.skey);
@@ -5284,7 +5284,6 @@ static int32_t convertQueryMsg(SQueryTableMsg *pQueryMsg, SArray **pTableIdList,
   pQueryMsg->numOfOutputCols = htons(pQueryMsg->numOfOutputCols);
   pQueryMsg->numOfGroupCols = htons(pQueryMsg->numOfGroupCols);
   pQueryMsg->tagCondLen    = htons(pQueryMsg->tagCondLen);
-  pQueryMsg->nameCondLen   = htons(pQueryMsg->nameCondLen);
   pQueryMsg->tsOffset      = htonl(pQueryMsg->tsOffset);
   pQueryMsg->tsLen         = htonl(pQueryMsg->tsLen);
   pQueryMsg->tsNumOfBlocks = htonl(pQueryMsg->tsNumOfBlocks);
@@ -5344,7 +5343,7 @@ static int32_t convertQueryMsg(SQueryTableMsg *pQueryMsg, SArray **pTableIdList,
   for (int32_t i = 0; i < pQueryMsg->numOfOutputCols; ++i) {
     (*pExpr)[i] = pExprMsg;
 
-    pExprMsg->colInfo.colIdx = htons(pExprMsg->colInfo.colIdx);
+    pExprMsg->colInfo.colIndex = htons(pExprMsg->colInfo.colIndex);
     pExprMsg->colInfo.colId  = htons(pExprMsg->colInfo.colId);
     pExprMsg->colInfo.flag   = htons(pExprMsg->colInfo.flag);
     pExprMsg->functionId     = htons(pExprMsg->functionId);
@@ -5398,7 +5397,7 @@ static int32_t convertQueryMsg(SQueryTableMsg *pQueryMsg, SArray **pTableIdList,
     pQueryMsg->orderByIdx = htons(pQueryMsg->orderByIdx);
     pQueryMsg->orderType = htons(pQueryMsg->orderType);
 
-    pMsg += sizeof(SColIndexEx) * pQueryMsg->numOfGroupCols;
+    pMsg += sizeof(SColIndex) * pQueryMsg->numOfGroupCols;
   } else {
     pQueryMsg->groupbyTagIds = 0;
   }
@@ -5417,8 +5416,8 @@ static int32_t convertQueryMsg(SQueryTableMsg *pQueryMsg, SArray **pTableIdList,
   
   // the tag query condition expression string is located at the end of query msg
   if (pQueryMsg->tagCondLen > 0) {
-    *tagCond = calloc(1, pQueryMsg->tagCondLen * TSDB_NCHAR_SIZE);
-    memcpy(*tagCond, pMsg, pQueryMsg->tagCondLen * TSDB_NCHAR_SIZE);
+    *tagCond = calloc(1, pQueryMsg->tagCondLen);
+    memcpy(*tagCond, pMsg, pQueryMsg->tagCondLen);
   }
   
   dTrace("qmsg:%p query on %d table(s), qrange:%" PRId64 "-%" PRId64 ", numOfGroupbyTagCols:%d, ts order:%d, "
@@ -5468,10 +5467,10 @@ static int32_t buildAirthmeticExprFromMsg(SSqlFunctionExpr *pExpr, SQueryTableMs
   
   // there may be duplicated referenced columns.
   num = i + 1;
-  pBinaryExprInfo->pReqColumns = malloc(sizeof(SColIndexEx) * num);
+  pBinaryExprInfo->pReqColumns = malloc(sizeof(SColIndex) * num);
   
   for (int32_t k = 0; k < num; ++k) {
-    SColIndexEx* pColIndex = &pBinaryExprInfo->pReqColumns[k];
+    SColIndex* pColIndex = &pBinaryExprInfo->pReqColumns[k];
     pColIndex->colId = ids[k];
   }
   
@@ -5568,19 +5567,19 @@ static SSqlGroupbyExpr *createGroupbyExprFromMsg(SQueryTableMsg *pQueryMsg, int3
 
   // using group by tag columns
   SSqlGroupbyExpr *pGroupbyExpr =
-      (SSqlGroupbyExpr *)malloc(sizeof(SSqlGroupbyExpr) + pQueryMsg->numOfGroupCols * sizeof(SColIndexEx));
+      (SSqlGroupbyExpr *)malloc(sizeof(SSqlGroupbyExpr) + pQueryMsg->numOfGroupCols * sizeof(SColIndex));
   if (pGroupbyExpr == NULL) {
     *code = TSDB_CODE_SERV_OUT_OF_MEMORY;
     return NULL;
   }
 
-  SColIndexEx *pGroupbyColInfo = (SColIndexEx *)pQueryMsg->groupbyTagIds;
+  SColIndex *pGroupbyColInfo = (SColIndex *)pQueryMsg->groupbyTagIds;
 
   pGroupbyExpr->numOfGroupCols = pQueryMsg->numOfGroupCols;
   pGroupbyExpr->orderType = pQueryMsg->orderType;
   pGroupbyExpr->orderIndex = pQueryMsg->orderByIdx;
 
-  memcpy(pGroupbyExpr->columnInfo, pGroupbyColInfo, sizeof(SColIndexEx) * pGroupbyExpr->numOfGroupCols);
+  memcpy(pGroupbyExpr->columnInfo, pGroupbyColInfo, sizeof(SColIndex) * pGroupbyExpr->numOfGroupCols);
   return pGroupbyExpr;
 }
 
@@ -5630,9 +5629,9 @@ static int32_t vnodeCreateFilterInfo(void *pQInfo, SQuery *pQuery) {
           return TSDB_CODE_INVALID_QUERY_MSG;
         }
 
-        if ((lower == TSDB_RELATION_LARGE_EQUAL || lower == TSDB_RELATION_LARGE) &&
+        if ((lower == TSDB_RELATION_GREATER_EQUAL || lower == TSDB_RELATION_GREATER) &&
             (upper == TSDB_RELATION_LESS_EQUAL || upper == TSDB_RELATION_LESS)) {
-          if (lower == TSDB_RELATION_LARGE_EQUAL) {
+          if (lower == TSDB_RELATION_GREATER_EQUAL) {
             if (upper == TSDB_RELATION_LESS_EQUAL) {
               pSingleColFilter->fp = rangeFilterArray[4];
             } else {
@@ -5673,16 +5672,16 @@ static void doUpdateExprColumnIndex(SQuery* pQuery) {
 //  int32_t i = 0, j = 0;
 //  while (i < pQuery->numOfCols && j < pMeterObj->numOfColumns) {
 //    if (pQuery->colList[i].data.colId == pMeterObj->schema[j].colId) {
-//      pQuery->colList[i++].colIdx = (int16_t)j++;
+//      pQuery->colList[i++].colIndex = (int16_t)j++;
 //    } else if (pQuery->colList[i].data.colId < pMeterObj->schema[j].colId) {
-//      pQuery->colList[i++].colIdx = -1;
+//      pQuery->colList[i++].colIndex = -1;
 //    } else if (pQuery->colList[i].data.colId > pMeterObj->schema[j].colId) {
 //      j++;
 //    }
 //  }
 
 //  while (i < pQuery->numOfCols) {
-//    pQuery->colList[i++].colIdx = -1;  // not such column in current meter
+//    pQuery->colList[i++].colIndex = -1;  // not such column in current meter
 //  }
   
   for(int32_t k = 0; k < pQuery->numOfOutputCols; ++k) {
@@ -5691,10 +5690,10 @@ static void doUpdateExprColumnIndex(SQuery* pQuery) {
       continue;
     }
     
-    SColIndexEx* pColIndexEx = &pSqlExprMsg->colInfo;
+    SColIndex* pColIndexEx = &pSqlExprMsg->colInfo;
     for(int32_t f = 0; f < pQuery->numOfCols; ++f) {
       if (pColIndexEx->colId == pQuery->colList[f].info.colId) {
-        pColIndexEx->colIdx = f;
+        pColIndexEx->colIndex = f;
         break;
       }
     }
@@ -5775,7 +5774,7 @@ static SQInfo *createQInfoImpl(SQueryTableMsg *pQueryMsg, SSqlGroupbyExpr *pGrou
 
   // set the output buffer capacity
   pQuery->rec.capacity = 4096;
-  pQuery->rec.threshold = 2;
+  pQuery->rec.threshold = 4000;
   
   for (int32_t col = 0; col < pQuery->numOfOutputCols; ++col) {
     assert(pExprs[col].interResBytes >= pExprs[col].resBytes);
@@ -5855,7 +5854,7 @@ static bool isValidQInfo(void *param) {
 }
 
 static void freeQInfo(SQInfo *pQInfo);
-static int32_t initializeQInfo(SQueryTableMsg *pQueryMsg, void* tsdb, SQInfo *pQInfo, bool isSTable) {
+static int32_t initQInfo(SQueryTableMsg *pQueryMsg, void* tsdb, SQInfo *pQInfo, bool isSTable) {
   int32_t code = TSDB_CODE_SUCCESS;
   SQuery *pQuery = pQInfo->runtimeEnv.pQuery;
   
@@ -5880,7 +5879,7 @@ static int32_t initializeQInfo(SQueryTableMsg *pQueryMsg, void* tsdb, SQInfo *pQ
   }
 
   // filter the qualified
-  if ((code = doInitializeQInfo(pQInfo, pTSBuf, tsdb, isSTable)) != TSDB_CODE_SUCCESS) {
+  if ((code = doInitQInfo(pQInfo, pTSBuf, tsdb, isSTable)) != TSDB_CODE_SUCCESS) {
     goto _error;
   }
 
@@ -6004,11 +6003,11 @@ static int32_t doDumpQueryResult(SQInfo *pQInfo, char *data) {
              pQuery->sdata[0]->data, strerror(errno));
     }
   } else {
-    doCopyQueryResultToMsg(pQInfo, pQuery->rec.size, data);
+    doCopyQueryResultToMsg(pQInfo, pQuery->rec.rows, data);
   }
   
-  pQuery->rec.total += pQuery->rec.size;
-  dTrace("QInfo:%p current:%d, total:%d", pQInfo, pQuery->rec.size, pQuery->rec.total);
+  pQuery->rec.total += pQuery->rec.rows;
+  dTrace("QInfo:%p current:%d, total:%d", pQInfo, pQuery->rec.rows, pQuery->rec.total);
   
   return TSDB_CODE_SUCCESS;
   
@@ -6020,9 +6019,9 @@ int32_t qCreateQueryInfo(void* tsdb, SQueryTableMsg *pQueryMsg, SQInfo **pQInfo)
 
   int32_t code = TSDB_CODE_SUCCESS;
   
+  char* tagCond = NULL;
   SArray *pTableIdList = NULL;
   SSqlFuncExprMsg** pExprMsg = NULL;
-  wchar_t* tagCond = NULL;
   if ((code = convertQueryMsg(pQueryMsg, &pTableIdList, &pExprMsg, &tagCond)) != TSDB_CODE_SUCCESS) {
     return code;
   }
@@ -6050,21 +6049,23 @@ int32_t qCreateQueryInfo(void* tsdb, SQueryTableMsg *pQueryMsg, SQInfo **pQInfo)
     goto _query_over;
   }
   
-  // super table query
-  SArray* res = NULL;
   bool isSTableQuery = false;
+  SArray* res = NULL;
   if ((pQueryMsg->queryType & TSDB_QUERY_TYPE_STABLE_QUERY) != 0) {
     isSTableQuery = true;
     
     STableId* id = taosArrayGet(pTableIdList, 0);
     id->uid = -1;
     
-    res = tsdbQueryTableList(tsdb, id->uid, tagCond, pQueryMsg->tagCondLen);
+    res = taosArrayInit(8, sizeof(STableId));
+    
+    /*int32_t ret =*/ tsdbQueryTags(tsdb, id->uid, tagCond, pQueryMsg->tagCondLen, res);
     if (taosArrayGetSize(res) == 0) { // no qualified table in stable query in this vnode
       code = TSDB_CODE_SUCCESS;
       goto _query_over;
     }
   } else {
+    assert(taosArrayGetSize(pTableIdList) == 1);
     res = pTableIdList;
   }
   
@@ -6073,7 +6074,7 @@ int32_t qCreateQueryInfo(void* tsdb, SQueryTableMsg *pQueryMsg, SQInfo **pQInfo)
     code = TSDB_CODE_SERV_OUT_OF_MEMORY;
   }
   
-  code = initializeQInfo(pQueryMsg, tsdb, *pQInfo, isSTableQuery);
+  code = initQInfo(pQueryMsg, tsdb, *pQInfo, isSTableQuery);
   
 _query_over:
   if (code != TSDB_CODE_SUCCESS) {
@@ -6116,11 +6117,10 @@ void qTableQuery(SQInfo *pQInfo) {
   
   dTrace("QInfo:%p query task is launched", pQInfo);
   
-  int32_t numOfTables = taosArrayGetSize(pQInfo->pTableIdList);
-  if (numOfTables == 1) {
-    singleTableQueryImpl(pQInfo);
+  if (pQInfo->runtimeEnv.stableQuery) {
+    stableQueryImpl(pQInfo);
   } else {
-    multiTableQueryImpl(pQInfo);
+    tableQueryImpl(pQInfo);
   }
   
   //  vnodeDecRefCount(pQInfo);
@@ -6138,7 +6138,7 @@ int32_t qRetrieveQueryResultInfo(SQInfo *pQInfo) {
   }
 
   sem_wait(&pQInfo->dataReady);
-  dTrace("QInfo:%p retrieve result info, rowsize:%d, rows:%d, code:%d", pQInfo, pQuery->rowSize, pQuery->rec.size,
+  dTrace("QInfo:%p retrieve result info, rowsize:%d, rows:%d, code:%d", pQInfo, pQuery->rowSize, pQuery->rec.rows,
       pQInfo->code);
   
   return pQInfo->code;
@@ -6167,12 +6167,12 @@ int32_t qDumpRetrieveResult(SQInfo *pQInfo, SRetrieveTableRsp** pRsp, int32_t* c
   }
   
   SQuery* pQuery = pQInfo->runtimeEnv.pQuery;
-  size_t size = getResultSize(pQInfo, &pQuery->rec.size);
+  size_t size = getResultSize(pQInfo, &pQuery->rec.rows);
   *contLen = size + sizeof(SRetrieveTableRsp);
   
   // todo handle failed to allocate memory
   *pRsp = (SRetrieveTableRsp *)rpcMallocCont(*contLen);
-  (*pRsp)->numOfRows = htonl(pQuery->rec.size);
+  (*pRsp)->numOfRows = htonl(pQuery->rec.rows);
   
   int32_t code = pQInfo->code;
   if (code == TSDB_CODE_SUCCESS) {
@@ -6183,7 +6183,7 @@ int32_t qDumpRetrieveResult(SQInfo *pQInfo, SRetrieveTableRsp** pRsp, int32_t* c
     (*pRsp)->useconds = 0;
   }
   
-  if (pQuery->rec.size > 0 && code == TSDB_CODE_SUCCESS) {
+  if (pQuery->rec.rows > 0 && code == TSDB_CODE_SUCCESS) {
     code = doDumpQueryResult(pQInfo, (*pRsp)->data);
   } else {
     setQueryStatus(pQuery, QUERY_OVER);
diff --git a/src/query/src/sql.c b/src/query/src/sql.c
index f1dce997fef02772ad6b0effa8084e8c26e9ef4e..d52e58395a13e33dc6cfbfc6565d1d2d2e235781 100644
--- a/src/query/src/sql.c
+++ b/src/query/src/sql.c
@@ -2471,13 +2471,13 @@ static void yy_reduce(
   yymsp[-1].minor.yy380 = yylhsminor.yy380;
         break;
       case 152: /* sortorder ::= ASC */
-{yymsp[0].minor.yy250 = TSQL_SO_ASC; }
+{yymsp[0].minor.yy250 = TSDB_ORDER_ASC; }
         break;
       case 153: /* sortorder ::= DESC */
-{yymsp[0].minor.yy250 = TSQL_SO_DESC;}
+{yymsp[0].minor.yy250 = TSDB_ORDER_DESC;}
         break;
       case 154: /* sortorder ::= */
-{yymsp[1].minor.yy250 = TSQL_SO_ASC;}
+{yymsp[1].minor.yy250 = TSDB_ORDER_ASC;}
         break;
       case 157: /* grouplist ::= grouplist COMMA item */
 {
diff --git a/src/query/tests/astTest.cpp b/src/query/tests/astTest.cpp
index 3b1f36e90f9fc4001fcf11d5dbcf105985787205..0f41ebea2667c1715d22e98a5968bc4ce6ad3792 100644
--- a/src/query/tests/astTest.cpp
+++ b/src/query/tests/astTest.cpp
@@ -255,7 +255,7 @@ static void testQueryStr(SSchema *schema, int32_t numOfCols, char *sql, tSkipLis
   printf("expr is: %s\n", str);
 
   SArray *result = NULL;
-  //  tSQLBinaryExprTraverse(pExpr, pSkipList, result, tSkipListNodeFilterCallback, &result);
+  //  tExprTreeTraverse(pExpr, pSkipList, result, tSkipListNodeFilterCallback, &result);
   //  printf("the result is:%lld\n", result.num);
   //
   //  bool findResult = false;
@@ -533,7 +533,7 @@ tExprNode* createExpr2() {
   auto *p2 = (tExprNode*) calloc(1, sizeof(tExprNode));
   p2->nodeType = TSQL_NODE_EXPR;
   
-  p2->_node.optr = TSDB_RELATION_LARGE_EQUAL;
+  p2->_node.optr = TSDB_RELATION_GREATER_EQUAL;
   p2->_node.pLeft = pLeft1;
   p2->_node.pRight = pRight1;
   p2->_node.hasPK = false;
@@ -556,7 +556,8 @@ void exprSerializeTest1() {
   ASSERT_TRUE(size > 0);
   char* b = tbufGetData(&buf, false);
   
-  tExprNode* p2 = exprTreeFromBinary(b, size);
+  tExprNode* p2 = NULL;
+  exprTreeFromBinary(b, size, &p2);
   ASSERT_EQ(p1->nodeType, p2->nodeType);
   
   ASSERT_EQ(p2->_node.optr, p1->_node.optr);
@@ -592,7 +593,8 @@ void exprSerializeTest2() {
   ASSERT_TRUE(size > 0);
   char* b = tbufGetData(&buf, false);
   
-  tExprNode* p2 = exprTreeFromBinary(b, size);
+  tExprNode* p2 = NULL;
+  exprTreeFromBinary(b, size, &p2);
   ASSERT_EQ(p1->nodeType, p2->nodeType);
   
   ASSERT_EQ(p2->_node.optr, p1->_node.optr);
@@ -617,7 +619,7 @@ void exprSerializeTest2() {
   
   ASSERT_EQ(c1Right->nodeType, c2Right->nodeType);
   ASSERT_EQ(c2Right->nodeType, TSQL_NODE_EXPR);
-  ASSERT_EQ(c2Right->_node.optr, TSDB_RELATION_LARGE_EQUAL);
+  ASSERT_EQ(c2Right->_node.optr, TSDB_RELATION_GREATER_EQUAL);
   ASSERT_EQ(c2Right->_node.pRight->pVal->dKey, 91.99);
   
   ASSERT_EQ(p2->_node.hasPK, true);
diff --git a/src/query/tests/tsBufTest.cpp b/src/query/tests/tsBufTest.cpp
index ff58e2a97446da04f96cc23fe224632fa7f7ad49..f50e1a5a718b0a197c602acec7dc6249410e3e21 100644
--- a/src/query/tests/tsBufTest.cpp
+++ b/src/query/tests/tsBufTest.cpp
@@ -37,7 +37,7 @@ void simpleTest() {
 
   int64_t* list = createTsList(10, 10000000, 30);
   tsBufAppend(pTSBuf, 0, tag, (const char*)list, num * sizeof(int64_t));
-  EXPECT_EQ(pTSBuf->tsOrder, TSQL_SO_ASC);
+  EXPECT_EQ(pTSBuf->tsOrder, TSDB_ORDER_ASC);
 
   EXPECT_EQ(pTSBuf->tsData.len, sizeof(int64_t) * num);
   EXPECT_EQ(pTSBuf->block.tag, tag);
@@ -65,7 +65,7 @@ void largeTSTest() {
   EXPECT_EQ(pTSBuf->tsData.len, 0);
   EXPECT_EQ(pTSBuf->block.tag, tag);
   EXPECT_EQ(pTSBuf->numOfVnodes, 1);
-  EXPECT_EQ(pTSBuf->tsOrder, TSQL_SO_ASC);
+  EXPECT_EQ(pTSBuf->tsOrder, TSDB_ORDER_ASC);
 
   tsBufFlush(pTSBuf);
   EXPECT_EQ(pTSBuf->tsData.len, 0);
@@ -91,7 +91,7 @@ void multiTagsTest() {
     start += step * num;
   }
 
-  EXPECT_EQ(pTSBuf->tsOrder, TSQL_SO_ASC);
+  EXPECT_EQ(pTSBuf->tsOrder, TSDB_ORDER_ASC);
   EXPECT_EQ(pTSBuf->tsData.len, num * sizeof(int64_t));
 
   EXPECT_EQ(pTSBuf->block.tag, numOfTags - 1);
@@ -127,7 +127,7 @@ void multiVnodeTagsTest() {
     EXPECT_EQ(pTSBuf->numOfVnodes, j + 1);
   }
 
-  EXPECT_EQ(pTSBuf->tsOrder, TSQL_SO_ASC);
+  EXPECT_EQ(pTSBuf->tsOrder, TSDB_ORDER_ASC);
   EXPECT_EQ(pTSBuf->tsData.len, num * sizeof(int64_t));
   EXPECT_EQ(pTSBuf->block.tag, numOfTags - 1);
 
@@ -167,7 +167,7 @@ void loadDataTest() {
     EXPECT_EQ(pTSBuf->numOfVnodes, j + 1);
   }
 
-  EXPECT_EQ(pTSBuf->tsOrder, TSQL_SO_ASC);
+  EXPECT_EQ(pTSBuf->tsOrder, TSDB_ORDER_ASC);
 
   EXPECT_EQ(pTSBuf->tsData.len, num * sizeof(int64_t));
   EXPECT_EQ(pTSBuf->block.tag, numOfTags - 1);
@@ -252,7 +252,7 @@ void TSTraverse() {
   int64_t s = taosGetTimestampUs();
   printf("start:%" PRIu64 "\n", s);
 
-  pTSBuf->cur.order = TSQL_SO_DESC;
+  pTSBuf->cur.order = TSDB_ORDER_DESC;
 
   // complete reverse traverse
   int32_t x = 0;
@@ -263,7 +263,7 @@ void TSTraverse() {
 
   // specify the data block with vnode and tags value
   tsBufResetPos(pTSBuf);
-  pTSBuf->cur.order = TSQL_SO_DESC;
+  pTSBuf->cur.order = TSDB_ORDER_DESC;
 
   int32_t startVnode = 1;
   int32_t startTag = 2;
@@ -297,7 +297,7 @@ void TSTraverse() {
 
   /////////////////////////////////////////////////////////////////////////////////
   // traverse
-  pTSBuf->cur.order = TSQL_SO_ASC;
+  pTSBuf->cur.order = TSDB_ORDER_ASC;
   tsBufResetPos(pTSBuf);
 
   // complete forwards traverse
@@ -308,7 +308,7 @@ void TSTraverse() {
 
   // specify the data block with vnode and tags value
   tsBufResetPos(pTSBuf);
-  pTSBuf->cur.order = TSQL_SO_ASC;
+  pTSBuf->cur.order = TSDB_ORDER_ASC;
 
   startVnode = 1;
   startTag = 2;
diff --git a/src/util/inc/tarray.h b/src/util/inc/tarray.h
index 6b70780d10482610ef64b1c50640756db4204bd6..28ebb1823582cad97af5ff2ed5c406d8edeb9e16 100644
--- a/src/util/inc/tarray.h
+++ b/src/util/inc/tarray.h
@@ -100,6 +100,12 @@ void taosArrayRemove(SArray* pArray, size_t index);
  */
 void taosArrayCopy(SArray* pDst, SArray* pSrc);
 
+/**
+ * clone a new array
+ * @param pSrc
+ */
+SArray* taosArrayClone(SArray* pSrc);
+
 /**
  * destroy array list
  * @param pArray
diff --git a/src/util/inc/tcompare.h b/src/util/inc/tcompare.h
new file mode 100644
index 0000000000000000000000000000000000000000..3ac0d3d1703c2da27b4a277bd877ef9e32a9e402
--- /dev/null
+++ b/src/util/inc/tcompare.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TDENGINE_TCOMPARE_H
+#define TDENGINE_TCOMPARE_H
+
+#include "os.h"
+
+int32_t compareInt32Val(const void *pLeft, const void *pRight);
+
+int32_t compareInt64Val(const void *pLeft, const void *pRight);
+
+int32_t compareInt16Val(const void *pLeft, const void *pRight);
+
+int32_t compareInt8Val(const void *pLeft, const void *pRight);
+
+int32_t compareIntDoubleVal(const void *pLeft, const void *pRight);
+
+int32_t compareDoubleIntVal(const void *pLeft, const void *pRight);
+
+int32_t compareDoubleVal(const void *pLeft, const void *pRight);
+
+int32_t compareStrVal(const void *pLeft, const void *pRight);
+
+int32_t compareWStrVal(const void *pLeft, const void *pRight);
+
+__compar_fn_t getKeyComparFunc(int32_t keyType);
+
+__compar_fn_t getComparFunc(int32_t type, int32_t filterDataType);
+
+#endif  // TDENGINE_TCOMPARE_H
diff --git a/src/util/inc/tskiplist.h b/src/util/inc/tskiplist.h
index 18404f89c27d2c122e813edae674bb3869c451b7..dc67d6dad51f1b1c0835110d0e639a082fec4711 100644
--- a/src/util/inc/tskiplist.h
+++ b/src/util/inc/tskiplist.h
@@ -13,8 +13,8 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef TBASE_TSKIPLIST_H
-#define TBASE_TSKIPLIST_H
+#ifndef TDENGINE_TSKIPLIST_H
+#define TDENGINE_TSKIPLIST_H
 
 #ifdef __cplusplus
 extern "C" {
@@ -24,10 +24,6 @@ extern "C" {
 #include "taosdef.h"
 #include "tarray.h"
 
-/*
- * key of each node
- * todo move to as the global structure in all search codes...
- */
 #define MAX_SKIP_LIST_LEVEL 15
 #define SKIP_LIST_RECORD_PERFORMANCE 0
 
@@ -35,11 +31,11 @@ typedef char *SSkipListKey;
 typedef char *(*__sl_key_fn_t)(const void *);
 
 /**
+ * the skip list node is located in a consecutive memory area,
  * the format of skip list node is as follows:
  * +------------+-----------------------+------------------------+-----+------+
  * | node level | forward pointer array | backward pointer array | key | data |
  * +------------+-----------------------+------------------------+-----+------+
- * the skiplist node is located in a consecutive memory area, key will not be copy to skip list
  */
 typedef struct SSkipListNode {
   uint8_t level;
@@ -136,7 +132,8 @@ typedef struct SSkipList {
 typedef struct SSkipListIterator {
   SSkipList *    pSkipList;
   SSkipListNode *cur;
-  int64_t        num;
+  int32_t        step;          // the number of nodes that have been checked already
+  int32_t        order;         // order of the iterator
 } SSkipListIterator;
 
 /**
@@ -205,6 +202,15 @@ void tSkipListPrint(SSkipList *pSkipList, int16_t nlevel);
  */
 SSkipListIterator *tSkipListCreateIter(SSkipList *pSkipList);
 
+/**
+ * create skip list iterator from the given node and specified the order
+ * @param pSkipList
+ * @param pNode     start position, instead of the first node in skip list
+ * @param order     traverse order of the iterator
+ * @return
+ */
+SSkipListIterator *tSkipListCreateIterFromVal(SSkipList* pSkipList, const char* val, int32_t type, int32_t order);
+
 /**
  * forward the skip list iterator
  * @param iter
@@ -245,4 +251,4 @@ void tSkipListRemoveNode(SSkipList *pSkipList, SSkipListNode *pNode);
 }
 #endif
 
-#endif  // TBASE_TSKIPLIST_H
+#endif  // TDENGINE_TSKIPLIST_H
diff --git a/src/util/inc/tutil.h b/src/util/inc/tutil.h
index b80aad1cebab3782ad7e2c4751275d854ef5f92c..c4c802a68881107da8a09044ea4eb4aa206c9340 100644
--- a/src/util/inc/tutil.h
+++ b/src/util/inc/tutil.h
@@ -121,10 +121,6 @@ int64_t strnatoi(char *num, int32_t len);
 
 char* strreplace(const char* str, const char* pattern, const char* rep);
 
-#define POW2(x) ((x) * (x))
-
-int32_t strdequote(char *src);
-
 char *paGetToken(char *src, char **token, int32_t *tokenLen);
 
 void taosMsleep(int32_t mseconds);
@@ -133,8 +129,6 @@ int32_t taosByteArrayToHexStr(char bytes[], int32_t len, char hexstr[]);
 
 int32_t taosHexStrToByteArray(char hexstr[], char bytes[]);
 
-int64_t str2int64(char *str);
-
 int32_t taosFileRename(char *fullPath, char *suffix, char delimiter, char **dstPath);
 
 /**
diff --git a/src/util/src/tarray.c b/src/util/src/tarray.c
index eb1d2133174b59a0ba93830a51986cbc78dc4c4b..d97b220a40a83450179ebe8d9c10597b83843bc0 100755
--- a/src/util/src/tarray.c
+++ b/src/util/src/tarray.c
@@ -160,6 +160,21 @@ void taosArrayCopy(SArray* pDst, SArray* pSrc) {
   pDst->size = pSrc->size;
 }
 
+SArray* taosArrayClone(SArray* pSrc) {
+  assert(pSrc != NULL);
+  
+  if (pSrc->size == 0) { // empty array list
+    return taosArrayInit(8, pSrc->elemSize);
+  }
+  
+  SArray* dst = taosArrayInit(pSrc->size, pSrc->elemSize);
+  
+  memcpy(dst->pData, pSrc->pData, pSrc->elemSize * pSrc->size);
+  dst->size = pSrc->size;
+  return dst;
+}
+
+
 void taosArrayDestroy(SArray* pArray) {
   if (pArray == NULL) {
     return;
diff --git a/src/util/src/tcompare.c b/src/util/src/tcompare.c
new file mode 100644
index 0000000000000000000000000000000000000000..401db9279a23e9462d472ce30ea11c701704677e
--- /dev/null
+++ b/src/util/src/tcompare.c
@@ -0,0 +1,192 @@
+#include "taosdef.h"
+#include "tcompare.h"
+
+int32_t compareInt32Val(const void *pLeft, const void *pRight) {
+  int32_t ret = GET_INT32_VAL(pLeft) - GET_INT32_VAL(pRight);
+  if (ret == 0) {
+    return 0;
+  } else {
+    return ret > 0 ? 1 : -1;
+  }
+}
+
+int32_t compareInt64Val(const void *pLeft, const void *pRight) {
+  int32_t ret = GET_INT64_VAL(pLeft) - GET_INT64_VAL(pRight);
+  if (ret == 0) {
+    return 0;
+  } else {
+    return ret > 0 ? 1 : -1;
+  }
+}
+
+int32_t compareInt16Val(const void *pLeft, const void *pRight) {
+  int32_t ret = GET_INT16_VAL(pLeft) - GET_INT16_VAL(pRight);
+  if (ret == 0) {
+    return 0;
+  } else {
+    return ret > 0 ? 1 : -1;
+  }
+}
+
+int32_t compareInt8Val(const void *pLeft, const void *pRight) {
+  int32_t ret = GET_INT8_VAL(pLeft) - GET_INT8_VAL(pRight);
+  if (ret == 0) {
+    return 0;
+  } else {
+    return ret > 0 ? 1 : -1;
+  }
+}
+
+int32_t compareIntDoubleVal(const void *pLeft, const void *pRight) {
+  //  int64_t lhs = ((SSkipListKey *)pLeft)->i64Key;
+  //  double  rhs = ((SSkipListKey *)pRight)->dKey;
+  //  if (fabs(lhs - rhs) < FLT_EPSILON) {
+  //    return 0;
+  //  } else {
+  //    return (lhs > rhs) ? 1 : -1;
+  //  }
+  return 0;
+}
+
+int32_t compareDoubleIntVal(const void *pLeft, const void *pRight) {
+  //  double  lhs = ((SSkipListKey *)pLeft)->dKey;
+  //  int64_t rhs = ((SSkipListKey *)pRight)->i64Key;
+  //  if (fabs(lhs - rhs) < FLT_EPSILON) {
+  //    return 0;
+  //  } else {
+  //    return (lhs > rhs) ? 1 : -1;
+  //  }
+  return 0;
+}
+
+int32_t compareDoubleVal(const void *pLeft, const void *pRight) {
+  double ret = GET_DOUBLE_VAL(pLeft) - GET_DOUBLE_VAL(pRight);
+  if (fabs(ret) < FLT_EPSILON) {
+    return 0;
+  } else {
+    return ret > 0 ? 1 : -1;
+  }
+}
+
+int32_t compareStrVal(const void *pLeft, const void *pRight) {
+  int32_t ret = strcmp(pLeft, pRight);
+  if (ret == 0) {
+    return 0;
+  } else {
+    return ret > 0 ? 1 : -1;
+  }
+}
+
+int32_t compareWStrVal(const void *pLeft, const void *pRight) {
+  //  SSkipListKey *pL = (SSkipListKey *)pLeft;
+  //  SSkipListKey *pR = (SSkipListKey *)pRight;
+  //
+  //  if (pL->nLen == 0 && pR->nLen == 0) {
+  //    return 0;
+  //  }
+  //
+  //  // handle only one-side bound compare situation, there is only lower bound or only upper bound
+  //  if (pL->nLen == -1) {
+  //    return 1;  // no lower bound, lower bound is minimum, always return -1;
+  //  } else if (pR->nLen == -1) {
+  //    return -1;  // no upper bound, upper bound is maximum situation, always return 1;
+  //  }
+  //
+  //  int32_t ret = wcscmp(((SSkipListKey *)pLeft)->wpz, ((SSkipListKey *)pRight)->wpz);
+  //
+  //  if (ret == 0) {
+  //    return 0;
+  //  } else {
+  //    return ret > 0 ? 1 : -1;
+  //  }
+  return 0;
+}
+
+__compar_fn_t getComparFunc(int32_t type, int32_t filterDataType) {
+  __compar_fn_t comparFn = NULL;
+  
+  switch (type) {
+    case TSDB_DATA_TYPE_TINYINT:
+    case TSDB_DATA_TYPE_SMALLINT:
+    case TSDB_DATA_TYPE_INT:
+    case TSDB_DATA_TYPE_BIGINT: {
+      if (filterDataType == TSDB_DATA_TYPE_BIGINT) {
+        comparFn = compareInt64Val;
+        break;
+      }
+    }
+    case TSDB_DATA_TYPE_BOOL: {
+      if (filterDataType >= TSDB_DATA_TYPE_BOOL && filterDataType <= TSDB_DATA_TYPE_BIGINT) {
+        comparFn = compareInt32Val;
+      } else if (filterDataType >= TSDB_DATA_TYPE_FLOAT && filterDataType <= TSDB_DATA_TYPE_DOUBLE) {
+        comparFn = compareIntDoubleVal;
+      }
+      break;
+    }
+    case TSDB_DATA_TYPE_FLOAT:
+    case TSDB_DATA_TYPE_DOUBLE: {
+//      if (filterDataType >= TSDB_DATA_TYPE_BOOL && filterDataType <= TSDB_DATA_TYPE_BIGINT) {
+//        comparFn = compareDoubleIntVal;
+//      } else if (filterDataType >= TSDB_DATA_TYPE_FLOAT && filterDataType <= TSDB_DATA_TYPE_DOUBLE) {
+//        comparFn = compareDoubleVal;
+//      }
+      if (filterDataType == TSDB_DATA_TYPE_DOUBLE) {
+        comparFn = compareDoubleVal;
+      }
+      break;
+    }
+    case TSDB_DATA_TYPE_BINARY:
+      comparFn = compareStrVal;
+      break;
+    case TSDB_DATA_TYPE_NCHAR:
+      comparFn = compareWStrVal;
+      break;
+    default:
+      comparFn = compareInt32Val;
+      break;
+  }
+  
+  return comparFn;
+}
+
+__compar_fn_t getKeyComparFunc(int32_t keyType) {
+  __compar_fn_t comparFn = NULL;
+  
+  switch (keyType) {
+    case TSDB_DATA_TYPE_TINYINT:
+      comparFn = compareInt8Val;
+      break;
+    case TSDB_DATA_TYPE_SMALLINT:
+      comparFn = compareInt16Val;
+      break;
+    case TSDB_DATA_TYPE_INT:
+      comparFn = compareInt32Val;
+      break;
+    case TSDB_DATA_TYPE_BIGINT:
+    case TSDB_DATA_TYPE_TIMESTAMP:
+      comparFn = compareInt64Val;
+      break;
+    case TSDB_DATA_TYPE_BOOL:
+      comparFn = compareInt32Val;
+      break;
+    
+    case TSDB_DATA_TYPE_FLOAT:
+    case TSDB_DATA_TYPE_DOUBLE:
+      comparFn = compareDoubleVal;
+      break;
+    
+    case TSDB_DATA_TYPE_BINARY:
+      comparFn = compareStrVal;
+      break;
+    
+    case TSDB_DATA_TYPE_NCHAR:
+      comparFn = compareWStrVal;
+      break;
+    
+    default:
+      comparFn = compareInt32Val;
+      break;
+  }
+  
+  return comparFn;
+}
diff --git a/src/util/src/tglobalcfg.c b/src/util/src/tglobalcfg.c
index 88a3be0e02750a780b2c2b65fca152444b3c7578..8ce4530dbf997b6673d4e8cdd903428ea0a07ddc 100644
--- a/src/util/src/tglobalcfg.c
+++ b/src/util/src/tglobalcfg.c
@@ -14,13 +14,12 @@
  */
 
 #include "os.h"
-#include <locale.h>
 
+#include "taosdef.h"
+#include "taoserror.h"
 #include "tglobalcfg.h"
 #include "tkey.h"
 #include "tlog.h"
-#include "taosdef.h"
-#include "taoserror.h"
 #include "tsocket.h"
 #include "tsystem.h"
 #include "tutil.h"
@@ -840,9 +839,8 @@ void tsReadGlobalLogConfig() {
 
   FILE * fp;
   char * line, *option, *value;
-  size_t len;
   int    olen, vlen;
-  char   fileName[128];
+  char   fileName[PATH_MAX] = {0};
 
   mdebugFlag = 135;
   sdbDebugFlag = 135;
@@ -858,22 +856,26 @@ void tsReadGlobalLogConfig() {
   wordfree(&full_path);
 
   tsReadLogOption("logDir", logDir);
+  
   sprintf(fileName, "%s/taos.cfg", configDir);
   fp = fopen(fileName, "r");
   if (fp == NULL) {
-    printf("\noption file:%s not found, all options are set to system default\n", fileName);
+    printf("\nconfig file:%s not found, all variables are set to default\n", fileName);
     return;
   }
-
-  line = NULL;
+  
+  size_t len = 1024;
+  line = calloc(1, len);
+  
   while (!feof(fp)) {
-    tfree(line);
-    line = option = value = NULL;
-    len = olen = vlen = 0;
+    memset(line, 0, len);
+    
+    option = value = NULL;
+    olen = vlen = 0;
 
     getline(&line, &len, fp);
-    if (line == NULL) break;
-
+    line[len - 1] = 0;
+    
     paGetToken(line, &option, &olen);
     if (olen == 0) continue;
     option[olen] = 0;
@@ -892,25 +894,26 @@ void tsReadGlobalLogConfig() {
 bool tsReadGlobalConfig() {
   tsInitGlobalConfig();
 
-  FILE * fp;
   char * line, *option, *value, *value1;
-  size_t len;
   int    olen, vlen, vlen1;
-  char   fileName[128];
+  char   fileName[PATH_MAX] = {0};
 
   sprintf(fileName, "%s/taos.cfg", configDir);
-  fp = fopen(fileName, "r");
-  if (fp == NULL) {
-  } else {
-    line = NULL;
+  FILE* fp = fopen(fileName, "r");
+  
+  size_t len = 1024;
+  line = calloc(1, len);
+  
+  if (fp != NULL) {
     while (!feof(fp)) {
-      tfree(line);
-      line = option = value = NULL;
-      len = olen = vlen = 0;
+      memset(line, 0, len);
 
-      getline(&line, &len, fp);
-      if (line == NULL) break;
+      option = value = NULL;
+      olen = vlen = 0;
 
+      getline(&line, &len, fp);
+      line[len - 1] = 0;
+      
       paGetToken(line, &option, &olen);
       if (olen == 0) continue;
       option[olen] = 0;
@@ -922,14 +925,15 @@ bool tsReadGlobalConfig() {
       // For dataDir, the format is:
       // dataDir    /mnt/disk1    0
       paGetToken(value + vlen + 1, &value1, &vlen1);
-
+      
       tsReadConfigOption(option, value);
     }
 
-    tfree(line);
     fclose(fp);
   }
 
+  tfree(line);
+  
   if (tsReadStorageConfig) {
     tsReadStorageConfig();
   }
@@ -983,6 +987,7 @@ bool tsReadGlobalConfig() {
     strcpy(tsLocalIp, tsPrivateIp);
   }
 
+  // todo refactor
   tsVersion = 0;
   for (int i = 0; i < 10; i++) {
     if (version[i] >= '0' && version[i] <= '9') {
@@ -991,6 +996,7 @@ bool tsReadGlobalConfig() {
       break;
     }
   }
+  
   tsVersion = 10 * tsVersion;
 
   return true;
diff --git a/src/util/src/tskiplist.c b/src/util/src/tskiplist.c
index 0ef99b724488ad32958ce5cbcc86b3df90dc9336..138c75c1977b3a40a4fc0291ff4d93f4cf21d4c5 100644
--- a/src/util/src/tskiplist.c
+++ b/src/util/src/tskiplist.c
@@ -17,6 +17,7 @@
 #include "tlog.h"
 #include "tskiplist.h"
 #include "tutil.h"
+#include "tcompare.h"
 
 __attribute__ ((unused)) static FORCE_INLINE void recordNodeEachLevel(SSkipList *pSkipList, int32_t level) {  // record link count in each level
 #if SKIP_LIST_RECORD_PERFORMANCE
@@ -72,196 +73,54 @@ memset(pNode, 0, SL_NODE_HEADER_SIZE(_l));\
 
 static void tSkipListDoInsert(SSkipList *pSkipList, SSkipListNode **forward, SSkipListNode *pNode);
 static SSkipListNode* tSkipListDoAppend(SSkipList *pSkipList, SSkipListNode *pNode);
-
-int32_t compareInt32Val(const void *pLeft, const void *pRight) {
-  int32_t ret = GET_INT32_VAL(pLeft) - GET_INT32_VAL(pRight);
-  if (ret == 0) {
-    return 0;
-  } else {
-    return ret > 0 ? 1 : -1;
-  }
-}
-
-int32_t compareInt64Val(const void *pLeft, const void *pRight) {
-  int32_t ret = GET_INT64_VAL(pLeft) - GET_INT64_VAL(pRight);
-  if (ret == 0) {
-    return 0;
-  } else {
-    return ret > 0 ? 1 : -1;
-  }
-}
-
-int32_t compareInt16Val(const void *pLeft, const void *pRight) {
-  int32_t ret = GET_INT16_VAL(pLeft) - GET_INT16_VAL(pRight);
-  if (ret == 0) {
-    return 0;
-  } else {
-    return ret > 0 ? 1 : -1;
-  }
-}
-
-int32_t compareInt8Val(const void *pLeft, const void *pRight) {
-  int32_t ret = GET_INT8_VAL(pLeft) - GET_INT8_VAL(pRight);
-  if (ret == 0) {
-    return 0;
-  } else {
-    return ret > 0 ? 1 : -1;
-  }
-}
-
-int32_t compareIntDoubleVal(const void *pLeft, const void *pRight) {
-  //  int64_t lhs = ((SSkipListKey *)pLeft)->i64Key;
-  //  double  rhs = ((SSkipListKey *)pRight)->dKey;
-  //  if (fabs(lhs - rhs) < FLT_EPSILON) {
-  //    return 0;
-  //  } else {
-  //    return (lhs > rhs) ? 1 : -1;
-  //  }
-  return 0;
-}
-
-int32_t compareDoubleIntVal(const void *pLeft, const void *pRight) {
-  //  double  lhs = ((SSkipListKey *)pLeft)->dKey;
-  //  int64_t rhs = ((SSkipListKey *)pRight)->i64Key;
-  //  if (fabs(lhs - rhs) < FLT_EPSILON) {
-  //    return 0;
-  //  } else {
-  //    return (lhs > rhs) ? 1 : -1;
-  //  }
-  return 0;
-}
-
-int32_t compareDoubleVal(const void *pLeft, const void *pRight) {
-  double ret = GET_DOUBLE_VAL(pLeft) - GET_DOUBLE_VAL(pRight);
-  if (fabs(ret) < FLT_EPSILON) {
-    return 0;
-  } else {
-    return ret > 0 ? 1 : -1;
-  }
-}
-
-int32_t compareStrVal(const void *pLeft, const void *pRight) {
-  int32_t ret = strcmp(pLeft, pRight);
-  if (ret == 0) {
-    return 0;
-  } else {
-    return ret > 0 ? 1 : -1;
-  }
-}
-
-int32_t compareWStrVal(const void *pLeft, const void *pRight) {
-  //  SSkipListKey *pL = (SSkipListKey *)pLeft;
-  //  SSkipListKey *pR = (SSkipListKey *)pRight;
-  //
-  //  if (pL->nLen == 0 && pR->nLen == 0) {
-  //    return 0;
-  //  }
-  //
-  //  // handle only one-side bound compare situation, there is only lower bound or only upper bound
-  //  if (pL->nLen == -1) {
-  //    return 1;  // no lower bound, lower bound is minimum, always return -1;
-  //  } else if (pR->nLen == -1) {
-  //    return -1;  // no upper bound, upper bound is maximum situation, always return 1;
-  //  }
-  //
-  //  int32_t ret = wcscmp(((SSkipListKey *)pLeft)->wpz, ((SSkipListKey *)pRight)->wpz);
-  //
-  //  if (ret == 0) {
-  //    return 0;
-  //  } else {
-  //    return ret > 0 ? 1 : -1;
-  //  }
-  return 0;
-}
-
-static __compar_fn_t getKeyFilterComparator(SSkipList *pSkipList, int32_t filterDataType) {
-  __compar_fn_t comparFn = NULL;
-
-  switch (pSkipList->keyInfo.type) {
-    case TSDB_DATA_TYPE_TINYINT:
-    case TSDB_DATA_TYPE_SMALLINT:
-    case TSDB_DATA_TYPE_INT:
-    case TSDB_DATA_TYPE_BIGINT: {
-      if (filterDataType == TSDB_DATA_TYPE_BIGINT) {
-        comparFn = compareInt64Val;
-        break;
-      }
-    }
-    case TSDB_DATA_TYPE_BOOL: {
-      if (filterDataType >= TSDB_DATA_TYPE_BOOL && filterDataType <= TSDB_DATA_TYPE_BIGINT) {
-        comparFn = compareInt32Val;
-      } else if (filterDataType >= TSDB_DATA_TYPE_FLOAT && filterDataType <= TSDB_DATA_TYPE_DOUBLE) {
-        comparFn = compareIntDoubleVal;
-      }
-      break;
-    }
-    case TSDB_DATA_TYPE_FLOAT:
-    case TSDB_DATA_TYPE_DOUBLE: {
+static SSkipListIterator* doCreateSkipListIterator(SSkipList *pSkipList, int32_t order);
+
+//static __compar_fn_t getComparFunc(SSkipList *pSkipList, int32_t filterDataType) {
+//  __compar_fn_t comparFn = NULL;
+//
+//  switch (pSkipList->keyInfo.type) {
+//    case TSDB_DATA_TYPE_TINYINT:
+//    case TSDB_DATA_TYPE_SMALLINT:
+//    case TSDB_DATA_TYPE_INT:
+//    case TSDB_DATA_TYPE_BIGINT: {
+//      if (filterDataType == TSDB_DATA_TYPE_BIGINT) {
+//        comparFn = compareInt64Val;
+//        break;
+//      }
+//    }
+//    case TSDB_DATA_TYPE_BOOL: {
 //      if (filterDataType >= TSDB_DATA_TYPE_BOOL && filterDataType <= TSDB_DATA_TYPE_BIGINT) {
-//        comparFn = compareDoubleIntVal;
+//        comparFn = compareInt32Val;
 //      } else if (filterDataType >= TSDB_DATA_TYPE_FLOAT && filterDataType <= TSDB_DATA_TYPE_DOUBLE) {
+//        comparFn = compareIntDoubleVal;
+//      }
+//      break;
+//    }
+//    case TSDB_DATA_TYPE_FLOAT:
+//    case TSDB_DATA_TYPE_DOUBLE: {
+////      if (filterDataType >= TSDB_DATA_TYPE_BOOL && filterDataType <= TSDB_DATA_TYPE_BIGINT) {
+////        comparFn = compareDoubleIntVal;
+////      } else if (filterDataType >= TSDB_DATA_TYPE_FLOAT && filterDataType <= TSDB_DATA_TYPE_DOUBLE) {
+////        comparFn = compareDoubleVal;
+////      }
+//      if (filterDataType == TSDB_DATA_TYPE_DOUBLE) {
 //        comparFn = compareDoubleVal;
 //      }
-      if (filterDataType == TSDB_DATA_TYPE_DOUBLE) {
-        comparFn = compareDoubleVal;
-      }
-      break;
-    }
-    case TSDB_DATA_TYPE_BINARY:
-      comparFn = compareStrVal;
-      break;
-    case TSDB_DATA_TYPE_NCHAR:
-      comparFn = compareWStrVal;
-      break;
-    default:
-      comparFn = compareInt32Val;
-      break;
-  }
-
-  return comparFn;
-}
-
-static __compar_fn_t getKeyComparator(int32_t keyType) {
-  __compar_fn_t comparFn = NULL;
-
-  switch (keyType) {
-    case TSDB_DATA_TYPE_TINYINT:
-      comparFn = compareInt8Val;
-      break;
-    case TSDB_DATA_TYPE_SMALLINT:
-      comparFn = compareInt16Val;
-      break;
-    case TSDB_DATA_TYPE_INT:
-      comparFn = compareInt32Val;
-      break;
-    case TSDB_DATA_TYPE_BIGINT:
-    case TSDB_DATA_TYPE_TIMESTAMP:
-      comparFn = compareInt64Val;
-      break;
-    case TSDB_DATA_TYPE_BOOL:
-      comparFn = compareInt32Val;
-      break;
-
-    case TSDB_DATA_TYPE_FLOAT:
-    case TSDB_DATA_TYPE_DOUBLE:
-      comparFn = compareDoubleVal;
-      break;
-
-    case TSDB_DATA_TYPE_BINARY:
-      comparFn = compareStrVal;
-      break;
-
-    case TSDB_DATA_TYPE_NCHAR:
-      comparFn = compareWStrVal;
-      break;
-
-    default:
-      comparFn = compareInt32Val;
-      break;
-  }
-
-  return comparFn;
-}
+//      break;
+//    }
+//    case TSDB_DATA_TYPE_BINARY:
+//      comparFn = compareStrVal;
+//      break;
+//    case TSDB_DATA_TYPE_NCHAR:
+//      comparFn = compareWStrVal;
+//      break;
+//    default:
+//      comparFn = compareInt32Val;
+//      break;
+//  }
+//
+//  return comparFn;
+//}
 
 static bool initForwardBackwardPtr(SSkipList* pSkipList) {
   uint32_t maxLevel = pSkipList->maxLevel;
@@ -298,7 +157,7 @@ SSkipList *tSkipListCreate(uint8_t maxLevel, uint8_t keyType, uint8_t keyLen, ui
 
   pSkipList->keyInfo  = (SSkipListKeyInfo){.type = keyType, .len = keyLen, .dupKey = dupKey, .freeNode = freeNode};
   pSkipList->keyFn    = fn;
-  pSkipList->comparFn = getKeyComparator(keyType);
+  pSkipList->comparFn = getKeyComparFunc(keyType);
   pSkipList->maxLevel = maxLevel;
   pSkipList->level    = 1;
   
@@ -406,22 +265,18 @@ SSkipListNode *tSkipListPut(SSkipList *pSkipList, SSkipListNode *pNode) {
   SSkipListNode *px = pSkipList->pHead;
   SSkipListNode *forward[MAX_SKIP_LIST_LEVEL] = {0};
 
-  bool identical = false;
+  int32_t ret = -1;
   for (int32_t i = pSkipList->level - 1; i >= 0; --i) {
     SSkipListNode *p = SL_GET_FORWARD_POINTER(px, i);
     while (p != pSkipList->pTail) {
       char *key = SL_GET_NODE_KEY(pSkipList, p);
 
       // if the forward element is less than the specified key, forward one step
-      int32_t ret = pSkipList->comparFn(key, newDatakey);
+      ret = pSkipList->comparFn(key, newDatakey);
       if (ret < 0) {
         px = p;
         p = SL_GET_FORWARD_POINTER(px, i);
       } else {
-        if (identical == false) {
-          identical = (ret == 0);
-        }
-        
         break;
       }
     }
@@ -430,7 +285,7 @@ SSkipListNode *tSkipListPut(SSkipList *pSkipList, SSkipListNode *pNode) {
   }
 
   // if the skip list does not allowed identical key inserted, the new data will be discarded.
-  if (pSkipList->keyInfo.dupKey == 0 && identical) {
+  if (pSkipList->keyInfo.dupKey == 0 && ret == 0) {
     if (pSkipList->lock) {
       pthread_rwlock_unlock(pSkipList->lock);
     }
@@ -447,20 +302,13 @@ void tSkipListDoInsert(SSkipList *pSkipList, SSkipListNode **forward, SSkipListN
   
   for (int32_t i = 0; i < pNode->level; ++i) {
     SSkipListNode *x = forward[i];
-    
-//    if (x != pSkipList->pTail) {
-      SL_GET_BACKWARD_POINTER(pNode, i) = x;
+    SL_GET_BACKWARD_POINTER(pNode, i) = x;
 
-      SSkipListNode *next = SL_GET_FORWARD_POINTER(x, i);
-//      if (next) {
-        SL_GET_BACKWARD_POINTER(next, i) = pNode;
-//      }
+    SSkipListNode *next = SL_GET_FORWARD_POINTER(x, i);
+    SL_GET_BACKWARD_POINTER(next, i) = pNode;
 
-      SL_GET_FORWARD_POINTER(pNode, i) = next;
-      SL_GET_FORWARD_POINTER(x, i) = pNode;
-//    } else {
-//      SL_GET_FORWARD_POINTER(pSkipList->pHead, i) = pNode;
-//    }
+    SL_GET_FORWARD_POINTER(pNode, i) = next;
+    SL_GET_FORWARD_POINTER(x, i) = pNode;
   }
   
   atomic_add_fetch_32(&pSkipList->size, 1);
@@ -494,11 +342,9 @@ SSkipListNode* tSkipListDoAppend(SSkipList *pSkipList, SSkipListNode *pNode) {
 
 SArray* tSkipListGet(SSkipList *pSkipList, SSkipListKey pKey, int16_t keyType) {
   int32_t sLevel = pSkipList->level - 1;
-  int32_t ret = -1;
-
+  
   // result list
   SArray* sa = taosArrayInit(1, POINTER_BYTES);
-  
   SSkipListNode *pNode = pSkipList->pHead;
  
   if (pSkipList->lock) {
@@ -509,15 +355,16 @@ SArray* tSkipListGet(SSkipList *pSkipList, SSkipListKey pKey, int16_t keyType) {
   pSkipList->state.queryCount++;
 #endif
 
-  __compar_fn_t filterComparFn = getKeyFilterComparator(pSkipList, keyType);
-
+  __compar_fn_t filterComparFn = getComparFunc(pSkipList->keyInfo.type, keyType);
+  int32_t ret = -1;
   for (int32_t i = sLevel; i >= 0; --i) {
-    SSkipListNode *pNext = SL_GET_FORWARD_POINTER(pNode, i);
-    while (pNext != NULL) {
-      char *key = SL_GET_NODE_KEY(pSkipList, pNext);
+    SSkipListNode *p = SL_GET_FORWARD_POINTER(pNode, i);
+    while (p != pSkipList->pTail) {
+      char *key = SL_GET_NODE_KEY(pSkipList, p);
+      
       if ((ret = filterComparFn(key, pKey)) < 0) {
-        pNode = pNext;
-        pNext = SL_GET_FORWARD_POINTER(pNext, i);
+        pNode = p;
+        p = SL_GET_FORWARD_POINTER(p, i);
       } else {
         break;
       }
@@ -525,10 +372,6 @@ SArray* tSkipListGet(SSkipList *pSkipList, SSkipListKey pKey, int16_t keyType) {
 
     // find the qualified key
     if (ret == 0) {
-      if (pSkipList->lock) {
-        pthread_rwlock_unlock(pSkipList->lock);
-      }
-
       SSkipListNode* pResult = SL_GET_FORWARD_POINTER(pNode, i);
       taosArrayPush(sa, &pResult);
       
@@ -559,25 +402,57 @@ SSkipListIterator* tSkipListCreateIter(SSkipList *pSkipList) {
     return NULL;
   }
   
-  SSkipListIterator* iter = calloc(1, sizeof(SSkipListIterator));
-  
-  iter->pSkipList = pSkipList;
-  if (pSkipList->lock) {
-    pthread_rwlock_rdlock(pSkipList->lock);
+  return doCreateSkipListIterator(pSkipList, TSDB_ORDER_ASC);
+}
+
+SSkipListIterator *tSkipListCreateIterFromVal(SSkipList* pSkipList, const char* val, int32_t type, int32_t order) {
+  if (pSkipList == NULL) {
+    return NULL;
   }
   
-  iter->cur = NULL;
-  iter->num = pSkipList->size;
+  assert(order == TSDB_ORDER_ASC || order == TSDB_ORDER_DESC);
   
-  if (pSkipList->lock) {
-    pthread_rwlock_unlock(pSkipList->lock);
-  }
+  if (val == NULL) {
+    return doCreateSkipListIterator(pSkipList, order);
+  } else {
   
-  return iter;
+    SSkipListNode *forward[MAX_SKIP_LIST_LEVEL] = {0};
+  
+    int32_t ret = -1;
+    __compar_fn_t filterComparFn = getComparFunc(pSkipList->keyInfo.type, type);
+    SSkipListNode* pNode = pSkipList->pHead;
+    
+    for (int32_t i = pSkipList->level - 1; i >= 0; --i) {
+      SSkipListNode *p = SL_GET_FORWARD_POINTER(pNode, i);
+      while (p != pSkipList->pTail) {
+        char *key = SL_GET_NODE_KEY(pSkipList, p);
+      
+        if ((ret = filterComparFn(key, val)) < 0) {
+          pNode = p;
+          p = SL_GET_FORWARD_POINTER(p, i);
+        } else {
+          break;
+        }
+      }
+    
+      forward[i] = pNode;
+    }
+    
+    SSkipListIterator* iter = doCreateSkipListIterator(pSkipList, order);
+    
+    // set the initial position
+    if (order == TSDB_ORDER_ASC) {
+      iter->cur = forward[0]; // greater equals than the value
+    } else {
+      iter->cur = SL_GET_FORWARD_POINTER(forward[0], 0);
+    }
+    
+    return iter;
+  }
 }
 
 bool tSkipListIterNext(SSkipListIterator *iter) {
-  if (iter->num == 0 || iter->pSkipList == NULL) {
+  if (iter->pSkipList == NULL) {
     return false;
   }
   
@@ -587,26 +462,35 @@ bool tSkipListIterNext(SSkipListIterator *iter) {
     pthread_rwlock_rdlock(pSkipList->lock);
   }
   
-  if (iter->cur == NULL) {
-    iter->cur = SL_GET_FORWARD_POINTER(pSkipList->pHead, 0);
-  } else {
-    iter->cur = SL_GET_FORWARD_POINTER(iter->cur, 0);
+  if (iter->order == TSDB_ORDER_ASC) {  // ascending order iterate
+    if (iter->cur == NULL) {
+      iter->cur = SL_GET_FORWARD_POINTER(pSkipList->pHead, 0);
+    } else {
+      iter->cur = SL_GET_FORWARD_POINTER(iter->cur, 0);
+    }
+  } else { // descending order iterate
+    if (iter->cur == NULL) {
+      iter->cur = SL_GET_BACKWARD_POINTER(pSkipList->pTail, 0);
+    } else {
+      iter->cur = SL_GET_BACKWARD_POINTER(iter->cur, 0);
+    }
   }
   
   if (pSkipList->lock) {
     pthread_rwlock_unlock(pSkipList->lock);
   }
   
-  return iter->cur != pSkipList->pTail;
+  return (iter->order == TSDB_ORDER_ASC)? (iter->cur != pSkipList->pTail) : (iter->cur != pSkipList->pHead);
 }
 
 SSkipListNode *tSkipListIterGet(SSkipListIterator *iter) { 
-  if (iter == NULL || iter->cur == iter->pSkipList->pTail) {
+  if (iter == NULL || iter->cur == iter->pSkipList->pTail || iter->cur == iter->pSkipList->pHead) {
      return NULL;
   } else {
     return iter->cur;
   }
 }
+
 void* tSkipListDestroyIter(SSkipListIterator* iter) {
   if (iter == NULL) {
     return NULL;
@@ -622,7 +506,7 @@ void* tSkipListDestroyIter(SSkipListIterator* iter) {
 //  SSkipListNode *p = pStartNode;
 //  int32_t        numOfRes = 0;
 //
-//  __compar_fn_t filterComparFn = getKeyFilterComparator(pSkipList, pEndKey->nType);
+//  __compar_fn_t filterComparFn = getComparFunc(pSkipList, pEndKey->nType);
 //  while (p != NULL) {
 //    int32_t ret = filterComparFn(&p->key, pEndKey);
 //    if (ret > 0) {
@@ -663,7 +547,7 @@ void* tSkipListDestroyIter(SSkipListIterator* iter) {
 //    return 0;
 //  }
 //
-//  __compar_fn_t filterComparFn = getKeyFilterComparator(pSkipList, pKey->nType);
+//  __compar_fn_t filterComparFn = getComparFunc(pSkipList, pKey->nType);
 //
 //  // backward check if previous nodes are with the same value.
 //  SSkipListNode *pPrev = pNode->pBackward[0];
@@ -679,11 +563,11 @@ void* tSkipListDestroyIter(SSkipListIterator* iter) {
 //  int32_t ret = -1;
 //
 //  SSkipListNode *x = &pSkipList->pHead;
-//  __compar_fn_t  filterComparFn = getKeyFilterComparator(pSkipList, pKey->nType);
+//  __compar_fn_t  filterComparFn = getComparFunc(pSkipList, pKey->nType);
 //
 //  pthread_rwlock_rdlock(&pSkipList->lock);
 //
-//  if (cond == TSDB_RELATION_LARGE_EQUAL || cond == TSDB_RELATION_LARGE) {
+//  if (cond == TSDB_RELATION_GREATER_EQUAL || cond == TSDB_RELATION_GREATER) {
 //    for (int32_t i = sLevel; i >= 0; --i) {
 //      while (x->pForward[i] != NULL && (ret = filterComparFn(&x->pForward[i]->key, pKey)) < 0) {
 //        x = x->pForward[i];
@@ -691,7 +575,7 @@ void* tSkipListDestroyIter(SSkipListIterator* iter) {
 //    }
 //
 //    // backward check if previous nodes are with the same value.
-//    if (cond == TSDB_RELATION_LARGE_EQUAL && ret == 0) {
+//    if (cond == TSDB_RELATION_GREATER_EQUAL && ret == 0) {
 //      SSkipListNode *pNode = x->pForward[0];
 //      while ((pNode->pBackward[0] != &pSkipList->pHead) && (filterComparFn(&pNode->pBackward[0]->key, pKey) == 0)) {
 //        pNode = pNode->pBackward[0];
@@ -700,10 +584,10 @@ void* tSkipListDestroyIter(SSkipListIterator* iter) {
 //      return pNode;
 //    }
 //
-//    if (ret > 0 || cond == TSDB_RELATION_LARGE_EQUAL) {
+//    if (ret > 0 || cond == TSDB_RELATION_GREATER_EQUAL) {
 //      pthread_rwlock_unlock(&pSkipList->lock);
 //      return x->pForward[0];
-//    } else {  // cond == TSDB_RELATION_LARGE && ret == 0
+//    } else {  // cond == TSDB_RELATION_GREATER && ret == 0
 //      SSkipListNode *pn = x->pForward[0];
 //      while (pn != NULL && filterComparFn(&pn->key, pKey) == 0) {
 //        pn = pn->pForward[0];
@@ -717,19 +601,9 @@ void* tSkipListDestroyIter(SSkipListIterator* iter) {
 //  return NULL;
 //}
 //
-// int32_t tSkipListRangeQuery(SSkipList *pSkipList, tSKipListQueryCond *pCond, SSkipListNode ***pRes) {
-//  pSkipList->state.queryCount++;
-//  SSkipListNode *pStart = tSkipListParQuery(pSkipList, &pCond->lowerBnd, pCond->lowerBndRelOptr);
-//  if (pStart == 0) {
-//    *pRes = NULL;
-//    return 0;
-//  }
-//
-//  return tSkipListEndParQuery(pSkipList, pStart, &pCond->upperBnd, pCond->upperBndRelOptr, pRes);
-//}
 //
 // static bool removeSupport(SSkipList *pSkipList, SSkipListNode **forward, SSkipListKey *pKey) {
-//  __compar_fn_t filterComparFn = getKeyFilterComparator(pSkipList, pKey->nType);
+//  __compar_fn_t filterComparFn = getComparFunc(pSkipList, pKey->nType);
 //
 //  if (filterComparFn(&forward[0]->pForward[0]->key, pKey) == 0) {
 //    SSkipListNode *p = forward[0]->pForward[0];
@@ -760,7 +634,7 @@ void* tSkipListDestroyIter(SSkipListIterator* iter) {
 //
 // bool tSkipListRemove(SSkipList *pSkipList, SSkipListKey *pKey) {
 //  SSkipListNode *forward[MAX_SKIP_LIST_LEVEL] = {0};
-//  __compar_fn_t  filterComparFn = getKeyFilterComparator(pSkipList, pKey->nType);
+//  __compar_fn_t  filterComparFn = getComparFunc(pSkipList, pKey->nType);
 //
 //  pthread_rwlock_rdlock(&pSkipList->lock);
 //
@@ -818,3 +692,12 @@ void tSkipListPrint(SSkipList *pSkipList, int16_t nlevel) {
     p = SL_GET_FORWARD_POINTER(p, nlevel - 1);
   }
 }
+
+SSkipListIterator* doCreateSkipListIterator(SSkipList *pSkipList, int32_t order) {
+  SSkipListIterator* iter = calloc(1, sizeof(SSkipListIterator));
+  
+  iter->pSkipList = pSkipList;
+  iter->order = order;
+  
+  return iter;
+}
diff --git a/src/util/src/tutil.c b/src/util/src/tutil.c
index cadb2e706c12cf0871712b4cb9d58a42942e8a85..5f4c90327992ed523ede1491c8a2878ea5a6d9d2 100644
--- a/src/util/src/tutil.c
+++ b/src/util/src/tutil.c
@@ -166,7 +166,7 @@ char* strtolower(char *dst, const char *src) {
 
 char *paGetToken(char *string, char **token, int32_t *tokenLen) {
   char quote = 0;
-
+  
   while (*string != 0) {
     if (*string == ' ' || *string == '\t') {
       ++string;
@@ -336,7 +336,7 @@ int32_t taosByteArrayToHexStr(char bytes[], int32_t len, char hexstr[]) {
   char    hexval[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
 
   for (i = 0; i < len; i++) {
-    hexstr[i * 2] = hexval[((bytes[i] >> 4) & 0xF)];
+    hexstr[i * 2] = hexval[((bytes[i] >> 4u) & 0xF)];
     hexstr[(i * 2) + 1] = hexval[(bytes[i]) & 0x0F];
   }
 
diff --git a/src/util/tests/skiplistTest.cpp b/src/util/tests/skiplistTest.cpp
index 9e690c3924062e67aea47974d0e2d08d78fa46b7..8bfa3a43c0476d0cc5a661c19df4422e663ce91c 100644
--- a/src/util/tests/skiplistTest.cpp
+++ b/src/util/tests/skiplistTest.cpp
@@ -104,6 +104,7 @@ void randKeyTest() {
 
   tSkipListDestroy(pSkipList);
 }
+
 void stringKeySkiplistTest() {
   const int32_t max_key_size = 12;
 
diff --git a/src/vnode/tsdb/inc/tsdb.h b/src/vnode/tsdb/inc/tsdb.h
index b2673413ae9eb66247c9f4ab7c68baac694fcbfb..ff3d4666fca4bf9c5696bde544f8c8702375c99c 100644
--- a/src/vnode/tsdb/inc/tsdb.h
+++ b/src/vnode/tsdb/inc/tsdb.h
@@ -208,7 +208,7 @@ typedef struct SBlockInfo {
 
 typedef struct SDataBlockInfo {
   STimeWindow window;
-  int32_t     size;
+  int32_t     rows;
   int32_t     numOfCols;
   int64_t     uid;
   int32_t     sid;
@@ -335,7 +335,7 @@ SArray *tsdbGetTableList(tsdb_query_handle_t *pQueryHandle);
  * @param pTagCond. tag query condition
  *
  */
-SArray *tsdbQueryTableList(tsdb_repo_t* tsdb, int64_t uid, const wchar_t *pTagCond, size_t len);
+int32_t tsdbQueryTags(tsdb_repo_t* tsdb, int64_t uid, const char *pTagCond, size_t len, SArray* list);
 
 /**
  * clean up the query handle
diff --git a/src/vnode/tsdb/src/tsdbMain.c b/src/vnode/tsdb/src/tsdbMain.c
index aa185f4bf2345ed0de74ed9aa46265c0a919eb08..62a43333aed5e9feb6bfa49944e6c607e70939a6 100644
--- a/src/vnode/tsdb/src/tsdbMain.c
+++ b/src/vnode/tsdb/src/tsdbMain.c
@@ -6,9 +6,10 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/sendfile.h>
 #include <sys/stat.h>
 #include <sys/types.h>
-#include <sys/sendfile.h>
+#include <tlog.h>
 #include <unistd.h>
 
 // #include "taosdef.h"
@@ -741,6 +742,7 @@ static int32_t tsdbInsertDataToTable(tsdb_repo_t *repo, SSubmitBlk *pBlock) {
   STableId tableId = {.uid = pBlock->uid, .tid = pBlock->tid};
   STable *pTable = tsdbIsValidTableToInsert(pRepo->tsdbMeta, tableId);
   if (pTable == NULL) {
+    dError("failed to get table for insert, uid:%" PRIu64 ", tid:%d", tableId.uid, tableId.tid);
     return TSDB_CODE_INVALID_TABLE_ID;
   }
 
diff --git a/src/vnode/tsdb/src/tsdbMeta.c b/src/vnode/tsdb/src/tsdbMeta.c
index 22f735713566edd8ae5740338855de5998a663b2..0eb6dde1d0b44c65a521f46e2dfdafdee069a16b 100644
--- a/src/vnode/tsdb/src/tsdbMeta.c
+++ b/src/vnode/tsdb/src/tsdbMeta.c
@@ -93,6 +93,11 @@ void tsdbFreeEncode(void *cont) {
   if (cont != NULL) free(cont);
 }
 
+static char* getTagIndexKey(const void* pData) {
+  STable* table = *(STable**) pData;
+  return getTupleKey(table->tagVal);
+}
+
 int tsdbRestoreTable(void *pHandle, void *cont, int contLen) {
   STsdbMeta *pMeta = (STsdbMeta *)pHandle;
 
@@ -101,8 +106,8 @@ int tsdbRestoreTable(void *pHandle, void *cont, int contLen) {
   
   if (pTable->type == TSDB_SUPER_TABLE) {
     pTable->pIndex =
-        tSkipListCreate(TSDB_SUPER_TABLE_SL_LEVEL, TSDB_DATA_TYPE_TIMESTAMP, sizeof(int64_t), 1, 0, 0, getTupleKey);
-  } 
+        tSkipListCreate(TSDB_SUPER_TABLE_SL_LEVEL, TSDB_DATA_TYPE_TIMESTAMP, sizeof(int64_t), 1, 0, 0, getTagIndexKey);
+  }
 
   tsdbAddTableToMeta(pMeta, pTable, false);
 
@@ -218,7 +223,7 @@ int32_t tsdbCreateTableImpl(STsdbMeta *pMeta, STableCfg *pCfg) {
       super->tagSchema = tdDupSchema(pCfg->tagSchema);
       super->tagVal = tdDataRowDup(pCfg->tagValues);
       super->pIndex = tSkipListCreate(TSDB_SUPER_TABLE_SL_LEVEL, TSDB_DATA_TYPE_TIMESTAMP, sizeof(int64_t), 1,
-                                                0, 0, getTupleKey);  // Allow duplicate key, no lock
+                                                0, 0, getTagIndexKey);  // Allow duplicate key, no lock
 
       if (super->pIndex == NULL) {
         tdFreeSchema(super->schema);
@@ -414,8 +419,6 @@ static int tsdbAddTableIntoIndex(STsdbMeta *pMeta, STable *pTable) {
   pNode->level = level;
   
   SSkipList* list = pSTable->pIndex;
-  
-  memcpy(SL_GET_NODE_KEY(list, pNode),  dataRowTuple(pTable->tagVal), colBytes(s));
   memcpy(SL_GET_NODE_DATA(pNode), &pTable, POINTER_BYTES);
   
   tSkipListPut(list, pNode);
diff --git a/src/vnode/tsdb/src/tsdbRead.c b/src/vnode/tsdb/src/tsdbRead.c
index a44174ae6613eccee7accaa9b14437c8b24e310a..30181bed1dfd0e533238958d4c9596e5c0fcfa22 100644
--- a/src/vnode/tsdb/src/tsdbRead.c
+++ b/src/vnode/tsdb/src/tsdbRead.c
@@ -19,13 +19,14 @@
 #include "tutil.h"
 
 #include "../../../query/inc/qast.h"
+#include "../../../query/inc/tlosertree.h"
 #include "../../../query/inc/tsqlfunction.h"
 #include "tsdb.h"
 #include "tsdbMain.h"
 
 #define EXTRA_BYTES 2
-#define PRIMARY_TSCOL_REQUIRED(c) (((SColumnInfoEx *)taosArrayGet(c, 0))->info.colId == PRIMARYKEY_TIMESTAMP_COL_INDEX)
-#define QUERY_IS_ASC_QUERY(o) (o == TSQL_SO_ASC)
+#define PRIMARY_TSCOL_REQUIRED(c) (((SColumnInfoEx*)taosArrayGet(c, 0))->info.colId == PRIMARYKEY_TIMESTAMP_COL_INDEX)
+#define QUERY_IS_ASC_QUERY(o) (o == TSDB_ORDER_ASC)
 #define QH_GET_NUM_OF_COLS(handle) (taosArrayGetSize((handle)->pColumns))
 
 enum {
@@ -46,9 +47,9 @@ typedef struct SQueryFilePos {
 
 typedef struct SDataBlockLoadInfo {
   SFileGroup* fileGroup;
-  int32_t slot;
-  int32_t sid;
-  SArray *pLoadedCols;
+  int32_t     slot;
+  int32_t     sid;
+  SArray*     pLoadedCols;
 } SDataBlockLoadInfo;
 
 typedef struct SLoadCompBlockInfo {
@@ -57,52 +58,31 @@ typedef struct SLoadCompBlockInfo {
   int32_t fileListIndex;
 } SLoadCompBlockInfo;
 
-typedef struct SQueryFilesInfo {
-  SArray *pFileInfo;
-  int32_t current;  // the memory mapped header file, NOTE: only one header file can be mmap.
-  int32_t vnodeId;
-
-  int32_t headerFd;  // header file fd
-  int64_t headerFileSize;
-  int32_t dataFd;
-  int32_t lastFd;
-
-  char headerFilePath[PATH_MAX];  // current opened header file name
-  char dataFilePath[PATH_MAX];    // current opened data file name
-  char lastFilePath[PATH_MAX];    // current opened last file path
-  char dbFilePathPrefix[PATH_MAX];
-} SQueryFilesInfo;
-
 typedef struct STableCheckInfo {
-  STableId    tableId;
-  TSKEY       lastKey;
-  STable *    pTableObj;
-  int64_t     offsetInHeaderFile;
-//  int32_t     numOfBlocks;
-  int32_t     start;
-  bool        checkFirstFileBlock;
-  
-  SCompIdx*   compIndex;
-  SCompInfo *pCompInfo;
-  
-  SDataCols* pDataCols;
-  SFileGroup* pFileGroup;
-  
-  SFileGroupIter fileIter;
+  STableId   tableId;
+  TSKEY      lastKey;
+  STable*    pTableObj;
+  int64_t    offsetInHeaderFile;
+  int32_t    start;
+  bool       checkFirstFileBlock;
+  SCompInfo* pCompInfo;
+  int32_t    numOfBlocks;  // number of qualified data blocks not the original blocks
+
+  SDataCols*         pDataCols;
   SSkipListIterator* iter;
 } STableCheckInfo;
 
 typedef struct {
-  SCompBlock *compBlock;
-  SField *    fields;
+  SCompBlock* compBlock;
+  SField*     fields;
 } SCompBlockFields;
 
-typedef struct STableDataBlockInfoEx {
+typedef struct STableBlockInfo {
   SCompBlockFields pBlock;
-  STableCheckInfo* pMeterDataInfo;
+  STableCheckInfo* pTableCheckInfo;
   int32_t          blockIndex;
-  int32_t          groupIdx; /* number of group is less than the total number of meters */
-} STableDataBlockInfoEx;
+  int32_t          groupIdx; /* number of group is less than the total number of tables */
+} STableBlockInfo;
 
 enum {
   SINGLE_TABLE_MODEL = 1,
@@ -110,17 +90,13 @@ enum {
 };
 
 typedef struct STsdbQueryHandle {
-  STsdbRepo*      pTsdb;
-  int8_t          model;  // access model, single table model or multi-table model
+  STsdbRepo*    pTsdb;
+  int8_t        model;  // access model, single table model or multi-table model
   SQueryFilePos cur;    // current position
   SQueryFilePos start;  // the start position, used for secondary/third iteration
-  int32_t         unzipBufSize;
-  char           *unzipBuffer;
-  char           *secondaryUnzipBuffer;
 
   SDataBlockLoadInfo dataBlockLoadInfo; /* record current block load information */
   SLoadCompBlockInfo compBlockLoadInfo; /* record current compblock information in SQuery */
-  SQueryFilesInfo vnodeFileInfo;
 
   int16_t     numOfRowsPerPage;
   uint16_t    flag;  // denotes reversed scan of data or not
@@ -129,24 +105,29 @@ typedef struct STsdbQueryHandle {
   int32_t     blockBufferSize;
   SCompBlock* pBlock;
   int32_t     numOfBlocks;
-  SField **   pFields;
-  SArray *    pColumns;         // column list, SColumnInfoEx array list
+  SField**    pFields;
+  SArray*     pColumns;  // column list, SColumnInfoEx array list
   bool        locateStart;
   int32_t     realNumOfRows;
   bool        loadDataAfterSeek;  // load data after seek.
   SArray*     pTableCheckInfo;
   int32_t     activeIndex;
-  
-  int32_t     tableIndex;
-  bool        isFirstSlot;
-  void *      qinfo;              // query info handle, for debug purpose
-  
-  STableDataBlockInfoEx *pDataBlockInfoEx;
+
+  bool    checkFiles;  // check file stage
+  int32_t tableIndex;
+  bool    isFirstSlot;
+  void*   qinfo;  // query info handle, for debug purpose
+
+  STableBlockInfo* pDataBlockInfo;
+
+  SFileGroup*    pFileGroup;
+  SFileGroupIter fileIter;
+  SCompIdx*      compIndex;
 } STsdbQueryHandle;
 
-int32_t doAllocateBuf(STsdbQueryHandle *pQueryHandle, int32_t rowsPerFileBlock) {
+int32_t doAllocateBuf(STsdbQueryHandle* pQueryHandle, int32_t rowsPerFileBlock) {
   // record the maximum column width among columns of this meter/metric
-  SColumnInfoEx *pColumn = taosArrayGet(pQueryHandle->pColumns, 0);
+  SColumnInfoEx* pColumn = taosArrayGet(pQueryHandle->pColumns, 0);
 
   int32_t maxColWidth = pColumn->info.bytes;
   for (int32_t i = 1; i < QH_GET_NUM_OF_COLS(pQueryHandle); ++i) {
@@ -156,89 +137,65 @@ int32_t doAllocateBuf(STsdbQueryHandle *pQueryHandle, int32_t rowsPerFileBlock)
     }
   }
 
-  // only one unzip buffer required, since we can unzip each column one by one
-  pQueryHandle->unzipBufSize = (size_t)(maxColWidth * rowsPerFileBlock + EXTRA_BYTES);  // plus extra_bytes
-  pQueryHandle->unzipBuffer = (char *)calloc(1, pQueryHandle->unzipBufSize);
-
-  pQueryHandle->secondaryUnzipBuffer = (char *)calloc(1, pQueryHandle->unzipBufSize);
-
-  if (pQueryHandle->unzipBuffer == NULL || pQueryHandle->secondaryUnzipBuffer == NULL) {
-    goto _error_clean;
-  }
-
   return TSDB_CODE_SUCCESS;
-
-_error_clean:
-  tfree(pQueryHandle->unzipBuffer);
-  tfree(pQueryHandle->secondaryUnzipBuffer);
-
-  return TSDB_CODE_SERV_OUT_OF_MEMORY;
 }
 
-static void initQueryFileInfoFD(SQueryFilesInfo *pVnodeFilesInfo) {
-  pVnodeFilesInfo->current = -1;
-  pVnodeFilesInfo->headerFileSize = -1;
-  
-  pVnodeFilesInfo->headerFd = FD_INITIALIZER;  // set the initial value
-  pVnodeFilesInfo->dataFd = FD_INITIALIZER;
-  pVnodeFilesInfo->lastFd = FD_INITIALIZER;
-}
-
-static void vnodeInitDataBlockLoadInfo(SDataBlockLoadInfo *pBlockLoadInfo) {
+static void tsdbInitDataBlockLoadInfo(SDataBlockLoadInfo* pBlockLoadInfo) {
   pBlockLoadInfo->slot = -1;
   pBlockLoadInfo->sid = -1;
   pBlockLoadInfo->fileGroup = NULL;
 }
 
-static void vnodeInitCompBlockLoadInfo(SLoadCompBlockInfo *pCompBlockLoadInfo) {
+static void tsdbInitCompBlockLoadInfo(SLoadCompBlockInfo* pCompBlockLoadInfo) {
   pCompBlockLoadInfo->sid = -1;
   pCompBlockLoadInfo->fileId = -1;
   pCompBlockLoadInfo->fileListIndex = -1;
 }
 
-tsdb_query_handle_t *tsdbQueryByTableId(tsdb_repo_t* tsdb, STsdbQueryCond *pCond, SArray *idList, SArray *pColumnInfo) {
+tsdb_query_handle_t* tsdbQueryByTableId(tsdb_repo_t* tsdb, STsdbQueryCond* pCond, SArray* idList, SArray* pColumnInfo) {
   // todo 1. filter not exist table
 
   // todo 2. add the reference count for each table that is involved in query
 
-  STsdbQueryHandle *pQueryHandle = calloc(1, sizeof(STsdbQueryHandle));
+  STsdbQueryHandle* pQueryHandle = calloc(1, sizeof(STsdbQueryHandle));
   pQueryHandle->order = pCond->order;
   pQueryHandle->window = pCond->twindow;
   pQueryHandle->pTsdb = tsdb;
+  pQueryHandle->compIndex = calloc(10000, sizeof(SCompIdx)),
 
   pQueryHandle->loadDataAfterSeek = false;
   pQueryHandle->isFirstSlot = true;
-  
+
   size_t size = taosArrayGetSize(idList);
   assert(size >= 1);
 
   pQueryHandle->pTableCheckInfo = taosArrayInit(size, sizeof(STableCheckInfo));
-  for(int32_t i = 0; i < size; ++i) {
-    STableId id = *(STableId*) taosArrayGet(idList, i);
-    
+  for (int32_t i = 0; i < size; ++i) {
+    STableId id = *(STableId*)taosArrayGet(idList, i);
+
     STableCheckInfo info = {
-      .lastKey = pQueryHandle->window.skey,
-      .tableId = id,
-      .pTableObj = tsdbGetTableByUid(tsdbGetMeta(tsdb), id.uid),  //todo this may be failed
-      .compIndex = calloc(10000, sizeof(SCompIdx)),
-      .pCompInfo = calloc(1, 1024),
+        .lastKey = pQueryHandle->window.skey,
+        .tableId = id,
+        .pTableObj = tsdbGetTableByUid(tsdbGetMeta(tsdb), id.uid),  // todo this may be failed
+        .pCompInfo = calloc(1, 1024),
     };
-    
+
     assert(info.pTableObj != NULL);
     taosArrayPush(pQueryHandle->pTableCheckInfo, &info);
   }
-  
-  pQueryHandle->model = (size > 1)? MULTI_TABLE_MODEL:SINGLE_TABLE_MODEL;
-  
+
+  pQueryHandle->model = (size > 1) ? MULTI_TABLE_MODEL : SINGLE_TABLE_MODEL;
+  pQueryHandle->checkFiles = 1;
+
   pQueryHandle->activeIndex = 0;
-  
+
   // malloc buffer in order to load data from file
   int32_t numOfCols = taosArrayGetSize(pColumnInfo);
   size_t  bufferCapacity = 4096;
-  
+
   pQueryHandle->pColumns = taosArrayInit(numOfCols, sizeof(SColumnInfoEx));
   for (int32_t i = 0; i < numOfCols; ++i) {
-    SColumnInfoEx *pCol = taosArrayGet(pColumnInfo, i);
+    SColumnInfoEx* pCol = taosArrayGet(pColumnInfo, i);
     SColumnInfoEx  pDest = {{0}, 0};
 
     pDest.pData = calloc(1, EXTRA_BYTES + bufferCapacity * pCol->info.bytes);
@@ -250,152 +207,224 @@ tsdb_query_handle_t *tsdbQueryByTableId(tsdb_repo_t* tsdb, STsdbQueryCond *pCond
     return NULL;
   }
 
-  initQueryFileInfoFD(&pQueryHandle->vnodeFileInfo);
-  vnodeInitDataBlockLoadInfo(&pQueryHandle->dataBlockLoadInfo);
-  vnodeInitCompBlockLoadInfo(&pQueryHandle->compBlockLoadInfo);
+  tsdbInitDataBlockLoadInfo(&pQueryHandle->dataBlockLoadInfo);
+  tsdbInitCompBlockLoadInfo(&pQueryHandle->compBlockLoadInfo);
 
   return (tsdb_query_handle_t)pQueryHandle;
 }
 
-static bool hasMoreDataInCacheForSingleModel(STsdbQueryHandle* pHandle) {
+static bool hasMoreDataInCache(STsdbQueryHandle* pHandle) {
   assert(pHandle->activeIndex == 0 && taosArrayGetSize(pHandle->pTableCheckInfo) == 1);
-  
+
   STableCheckInfo* pTableCheckInfo = taosArrayGet(pHandle->pTableCheckInfo, pHandle->activeIndex);
-  
-  STable *pTable = pTableCheckInfo->pTableObj;
+
+  STable* pTable = pTableCheckInfo->pTableObj;
   assert(pTable != NULL);
-  
+
   // no data in cache, abort
   if (pTable->mem == NULL && pTable->imem == NULL) {
     return false;
   }
-  
+
   // all data in mem are checked already.
   if (pTableCheckInfo->lastKey > pTable->mem->keyLast) {
     return false;
   }
-  
+
   return true;
 }
 
 // todo dynamic get the daysperfile
 static int32_t getFileIdFromKey(TSKEY key) {
-  return (int32_t)(key / 10); // set the starting fileId
+  return (int32_t)(key / 10);  // set the starting fileId
 }
 
-static int32_t getFileCompInfo(STableCheckInfo* pCheckInfo, SFileGroup* fileGroup) {
-  // check open file failed
+static int32_t binarySearchForBlockImpl(SCompBlock* pBlock, int32_t numOfBlocks, TSKEY skey, int32_t order);
+
+static int32_t getFileCompInfo(STsdbQueryHandle* pQueryHandle, int32_t* numOfBlocks, int32_t type) {
+  // todo check open file failed
+  SFileGroup* fileGroup = pQueryHandle->pFileGroup;
   if (fileGroup->files[TSDB_FILE_TYPE_HEAD].fd == FD_INITIALIZER) {
     fileGroup->files[TSDB_FILE_TYPE_HEAD].fd = open(fileGroup->files[TSDB_FILE_TYPE_HEAD].fname, O_RDONLY);
   }
-  
-  tsdbLoadCompIdx(fileGroup, pCheckInfo->compIndex, 10000); // todo set dynamic max tables
-  SCompIdx* compIndex = &pCheckInfo->compIndex[pCheckInfo->tableId.tid];
-  
-  if (compIndex->len == 0 || compIndex->numOfSuperBlocks == 0) {  // no data block in this file, try next file
-  
-  } else {
-    tsdbLoadCompBlocks(fileGroup, compIndex, pCheckInfo->pCompInfo);
+
+  // load all the comp offset value for all tables in this file
+  tsdbLoadCompIdx(fileGroup, pQueryHandle->compIndex, 10000);  // todo set dynamic max tables
+
+  *numOfBlocks = 0;
+  size_t numOfTables = taosArrayGetSize(pQueryHandle->pTableCheckInfo);
+
+  for (int32_t i = 0; i < numOfTables; ++i) {
+    STableCheckInfo* pCheckInfo = taosArrayGet(pQueryHandle->pTableCheckInfo, i);
+
+    SCompIdx* compIndex = &pQueryHandle->compIndex[pCheckInfo->tableId.tid];
+    if (compIndex->len == 0 || compIndex->numOfSuperBlocks == 0) {  // no data block in this file, try next file
+
+    } else {
+      tsdbLoadCompBlocks(fileGroup, compIndex, pCheckInfo->pCompInfo);
+
+      int32_t index = 0;
+      // discard the unqualified data block based on the query time window
+      int32_t start = binarySearchForBlockImpl(pCheckInfo->pCompInfo->blocks, compIndex->numOfSuperBlocks,
+                                               pQueryHandle->order, pCheckInfo->lastKey);
+
+      if (type == QUERY_RANGE_GREATER_EQUAL) {
+        if (pCheckInfo->lastKey <= pCheckInfo->pCompInfo->blocks[start].keyLast) {
+          //          break;
+        } else {
+          index = -1;
+        }
+      } else {
+        if (pCheckInfo->lastKey >= pCheckInfo->pCompInfo->blocks[start].keyFirst) {
+          //          break;
+        } else {
+          index = -1;
+        }
+      }
+
+      // not found in data blocks in current file
+      if (index == -1) {
+        continue;
+      }
+
+      // todo speedup the procedure of locating end block
+      int32_t e = start;
+      while (e < compIndex->numOfSuperBlocks &&
+             (pCheckInfo->pCompInfo->blocks[e].keyFirst <= pQueryHandle->window.ekey)) {
+        e += 1;
+      }
+
+      if (start > 0) {
+        memmove(pCheckInfo->pCompInfo->blocks, &pCheckInfo->pCompInfo->blocks[start], (e - start) * sizeof(SCompBlock));
+      }
+
+      pCheckInfo->numOfBlocks = (e - start);
+      (*numOfBlocks) += pCheckInfo->numOfBlocks;
+    }
   }
-  
+
   return TSDB_CODE_SUCCESS;
 }
 
-static int32_t binarySearchForBlockImpl(SCompBlock *pBlock, int32_t numOfBlocks, TSKEY skey, int32_t order) {
+int32_t binarySearchForBlockImpl(SCompBlock* pBlock, int32_t numOfBlocks, TSKEY skey, int32_t order) {
   int32_t firstSlot = 0;
   int32_t lastSlot = numOfBlocks - 1;
-  
+
   int32_t midSlot = firstSlot;
-  
+
   while (1) {
     numOfBlocks = lastSlot - firstSlot + 1;
     midSlot = (firstSlot + (numOfBlocks >> 1));
-    
+
     if (numOfBlocks == 1) break;
-    
+
     if (skey > pBlock[midSlot].keyLast) {
       if (numOfBlocks == 2) break;
-      if ((order == TSQL_SO_DESC) && (skey < pBlock[midSlot + 1].keyFirst)) break;
+      if ((order == TSDB_ORDER_DESC) && (skey < pBlock[midSlot + 1].keyFirst)) break;
       firstSlot = midSlot + 1;
     } else if (skey < pBlock[midSlot].keyFirst) {
-      if ((order == TSQL_SO_ASC) && (skey > pBlock[midSlot - 1].keyLast)) break;
+      if ((order == TSDB_ORDER_ASC) && (skey > pBlock[midSlot - 1].keyLast)) break;
       lastSlot = midSlot - 1;
     } else {
       break;  // got the slot
     }
   }
-  
+
   return midSlot;
 }
 
-static SDataBlockInfo getTrueDataBlockInfo(STsdbQueryHandle* pHandle, STableCheckInfo* pCheckInfo) {
-  SCompBlock *pDiskBlock = &pCheckInfo->pCompInfo->blocks[pHandle->cur.slot];
-  
+static SDataBlockInfo getTrueDataBlockInfo(STableCheckInfo* pCheckInfo, SCompBlock* pBlock) {
   SDataBlockInfo info = {
-      .window    = {.skey = pDiskBlock->keyFirst, .ekey = pDiskBlock->keyLast},
-      .numOfCols = pDiskBlock->numOfCols,
-      .size      = pDiskBlock->numOfPoints,
-      .sid       = pCheckInfo->tableId.tid,
-      .uid       = pCheckInfo->tableId.uid,
+      .window = {.skey = pBlock->keyFirst, .ekey = pBlock->keyLast},
+      .numOfCols = pBlock->numOfCols,
+      .rows = pBlock->numOfPoints,
+      .sid = pCheckInfo->tableId.tid,
+      .uid = pCheckInfo->tableId.uid,
   };
-  
+
   return info;
 }
 
-SArray *getDefaultLoadColumns(STsdbQueryHandle *pQueryHandle, bool loadTS);
-static void filterDataInDataBlock(STsdbQueryHandle *pQueryHandle, SDataCols* pCols, SArray *sa);
+SArray*        getDefaultLoadColumns(STsdbQueryHandle* pQueryHandle, bool loadTS);
+static void    filterDataInDataBlock(STsdbQueryHandle* pQueryHandle, STableCheckInfo* pCheckInfo, SCompBlock* pBlock,
+                                     SArray* sa);
+static int32_t binarySearchForKey(char* pValue, int num, TSKEY key, int order);
+
+static bool doLoadFileDataBlock(STsdbQueryHandle* pQueryHandle, SCompBlock* pBlock, STableCheckInfo* pCheckInfo) {
+  SCompData* data = calloc(1, sizeof(SCompData) + sizeof(SCompCol) * pBlock->numOfCols);
 
-static bool doLoadDataFromFileBlock(STsdbQueryHandle *pQueryHandle) {
-  SQueryFilePos *cur = &pQueryHandle->cur;
-  
-  STableCheckInfo* pCheckInfo = taosArrayGet(pQueryHandle->pTableCheckInfo, pQueryHandle->activeIndex);
-  SCompBlock* pBlock = &pCheckInfo->pCompInfo->blocks[cur->slot];
-  
-  SCompData* data = calloc(1, sizeof(SCompData)+ sizeof(SCompCol)*pBlock->numOfCols);
-  
   data->numOfCols = pBlock->numOfCols;
   data->uid = pCheckInfo->pTableObj->tableId.uid;
-  
-  pCheckInfo->pDataCols = tdNewDataCols(1000, 2, 4096);
-  tdInitDataCols(pCheckInfo->pDataCols, pCheckInfo->pTableObj->schema);
-  
-  SFile* pFile = &pCheckInfo->pFileGroup->files[TSDB_FILE_TYPE_DATA];
+
+  bool    blockLoaded = false;
+  SArray* sa = getDefaultLoadColumns(pQueryHandle, true);
+
+  if (pCheckInfo->pDataCols == NULL) {
+    pCheckInfo->pDataCols = tdNewDataCols(1000, 2, 4096);
+  }
+
+  tdInitDataCols(pCheckInfo->pDataCols, tsdbGetTableSchema(tsdbGetMeta(pQueryHandle->pTsdb), pCheckInfo->pTableObj));
+
+  SFile* pFile = &pQueryHandle->pFileGroup->files[TSDB_FILE_TYPE_DATA];
   if (pFile->fd == FD_INITIALIZER) {
     pFile->fd = open(pFile->fname, O_RDONLY);
   }
-  
-  tsdbLoadDataBlock(pFile, pBlock, 1, pCheckInfo->pDataCols, data);
-  return true;
+
+  if (tsdbLoadDataBlock(pFile, pBlock, 1, pCheckInfo->pDataCols, data) == 0) {
+    SDataBlockLoadInfo* pBlockLoadInfo = &pQueryHandle->dataBlockLoadInfo;
+
+    pBlockLoadInfo->fileGroup = pQueryHandle->pFileGroup;
+    pBlockLoadInfo->slot = pQueryHandle->cur.slot;
+    pBlockLoadInfo->sid = pCheckInfo->pTableObj->tableId.tid;
+
+    blockLoaded = true;
+  }
+
+  taosArrayDestroy(sa);
+  tfree(data);
+
+  TSKEY* d = (TSKEY*)pCheckInfo->pDataCols->cols[PRIMARYKEY_TIMESTAMP_COL_INDEX].pData;
+  assert(d[0] == pBlock->keyFirst && d[pBlock->numOfPoints - 1] == pBlock->keyLast);
+
+  return blockLoaded;
 }
 
-static bool loadQualifiedDataFromFileBlock(STsdbQueryHandle *pQueryHandle) {
-  SQueryFilePos *cur = &pQueryHandle->cur;
-  
-  STableCheckInfo* pCheckInfo = taosArrayGet(pQueryHandle->pTableCheckInfo, pQueryHandle->activeIndex);
-  SCompBlock* pBlock = &pCheckInfo->pCompInfo->blocks[cur->slot];
-  
-  SArray *sa = getDefaultLoadColumns(pQueryHandle, true);
+static bool loadFileDataBlock(STsdbQueryHandle* pQueryHandle, SCompBlock* pBlock, STableCheckInfo* pCheckInfo) {
+  SArray*        sa = getDefaultLoadColumns(pQueryHandle, true);
+  SQueryFilePos* cur = &pQueryHandle->cur;
+
   if (QUERY_IS_ASC_QUERY(pQueryHandle->order)) {
     // query ended in current block
     if (pQueryHandle->window.ekey < pBlock->keyLast) {
-      doLoadDataFromFileBlock(pQueryHandle);
-      filterDataInDataBlock(pQueryHandle, pCheckInfo->pDataCols, sa);
-    } else { // the whole block is loaded in to buffer
+      if (!doLoadFileDataBlock(pQueryHandle, pBlock, pCheckInfo)) {
+        return false;
+      }
+
+      SDataCols* pDataCols = pCheckInfo->pDataCols;
+
+      if (pCheckInfo->lastKey > pBlock->keyFirst) {
+        cur->pos =
+            binarySearchForKey(pDataCols->cols[0].pData, pBlock->numOfPoints, pCheckInfo->lastKey, pQueryHandle->order);
+      } else {
+        cur->pos = 0;
+      }
+
+      filterDataInDataBlock(pQueryHandle, pCheckInfo, pBlock, sa);
+    } else {  // the whole block is loaded in to buffer
       pQueryHandle->realNumOfRows = pBlock->numOfPoints;
     }
-  } else {// todo desc query
+  } else {  // todo desc query
     if (pQueryHandle->window.ekey > pBlock->keyFirst) {
-//
     }
   }
-  
+
   taosArrayDestroy(sa);
   return pQueryHandle->realNumOfRows > 0;
 }
 
-bool moveToNextBlock(STsdbQueryHandle *pQueryHandle, int32_t step) {
-  SQueryFilePos *cur = &pQueryHandle->cur;
-  
+bool moveToNextBlock(STsdbQueryHandle* pQueryHandle, int32_t step) {
+  SQueryFilePos* cur = &pQueryHandle->cur;
+
   if (pQueryHandle->cur.fid >= 0) {
     /*
      * 1. ascending  order. The last data block of data file
@@ -405,74 +434,70 @@ bool moveToNextBlock(STsdbQueryHandle *pQueryHandle, int32_t step) {
     int32_t          tid = pCheckInfo->tableId.tid;
 
     if ((step == QUERY_ASC_FORWARD_STEP &&
-         (pQueryHandle->cur.slot == pCheckInfo->compIndex[tid].numOfSuperBlocks - 1)) ||
+         (pQueryHandle->cur.slot == pQueryHandle->compIndex[tid].numOfSuperBlocks - 1)) ||
         (step == QUERY_DESC_FORWARD_STEP && (pQueryHandle->cur.slot == 0))) {
       // temporarily keep the position value, in case of no data qualified when move forwards(backwards)
-//      SQueryFilePos save = pQueryHandle->cur;
-      SFileGroup*   fgroup = tsdbGetFileGroupNext(&pCheckInfo->fileIter);
+      //      SQueryFilePos save = pQueryHandle->cur;
+      pQueryHandle->pFileGroup = tsdbGetFileGroupNext(&pQueryHandle->fileIter);
 
       int32_t fid = -1;
-      if (fgroup != NULL) {
-        if ((fid = getFileCompInfo(pCheckInfo, fgroup)) < 0) {
+      int32_t numOfBlocks = 0;
+
+      if (pQueryHandle->pFileGroup != NULL) {
+        if ((fid = getFileCompInfo(pQueryHandle, &numOfBlocks, 1)) < 0) {
         } else {
           cur->slot = (step == QUERY_ASC_FORWARD_STEP) ? 0 : pQueryHandle->numOfBlocks - 1;
           cur->pos = (step == QUERY_ASC_FORWARD_STEP) ? 0 : pQueryHandle->pBlock[cur->slot].numOfPoints - 1;
 
           SCompBlock* pBlock = &pCheckInfo->pCompInfo->blocks[cur->slot];
-          SCompData*  data = calloc(1, sizeof(SCompData) + sizeof(SCompCol) * pBlock->numOfCols);
-
-          data->numOfCols = pBlock->numOfCols;
-          data->uid = pCheckInfo->pTableObj->tableId.uid;
-
-          cur->fid = fgroup->fileId;
+          cur->fid = pQueryHandle->pFileGroup->fileId;
           assert(cur->pos >= 0 && cur->fid >= 0 && cur->slot >= 0);
 
           if (pBlock->keyFirst > pQueryHandle->window.ekey) {  // done
             return false;
           }
-          
-          loadQualifiedDataFromFileBlock(pQueryHandle);
-          return true;
+
+          return loadFileDataBlock(pQueryHandle, pBlock, pCheckInfo);
         }
       } else {  // check data in cache
         pQueryHandle->cur.fid = -1;
-        return hasMoreDataInCacheForSingleModel(pQueryHandle);
+        return hasMoreDataInCache(pQueryHandle);
       }
-    } else { // next block in the same file
+    } else {  // next block in the same file
       cur->slot += step;
 
       SCompBlock* pBlock = &pCheckInfo->pCompInfo->blocks[cur->slot];
       cur->pos = (step == QUERY_ASC_FORWARD_STEP) ? 0 : pBlock->numOfPoints - 1;
-      return loadQualifiedDataFromFileBlock(pQueryHandle);
+      return loadFileDataBlock(pQueryHandle, pBlock, pCheckInfo);
     }
   } else {  // data in cache
-    return hasMoreDataInCacheForSingleModel(pQueryHandle);
+    return hasMoreDataInCache(pQueryHandle);
   }
-  
+
   return false;
 }
 
-int vnodeBinarySearchKey(char *pValue, int num, TSKEY key, int order) {
+int vnodeBinarySearchKey(char* pValue, int num, TSKEY key, int order) {
   int    firstPos, lastPos, midPos = -1;
   int    numOfPoints;
-  TSKEY *keyList;
-  
+  TSKEY* keyList;
+
   if (num <= 0) return -1;
-  
-  keyList = (TSKEY *)pValue;
+
+  keyList = (TSKEY*)pValue;
   firstPos = 0;
   lastPos = num - 1;
-  
+
   if (order == 0) {
     // find the first position which is smaller than the key
     while (1) {
       if (key >= keyList[lastPos]) return lastPos;
       if (key == keyList[firstPos]) return firstPos;
       if (key < keyList[firstPos]) return firstPos - 1;
-      
+
       numOfPoints = lastPos - firstPos + 1;
       midPos = (numOfPoints >> 1) + firstPos;
-      
+
       if (key < keyList[midPos]) {
         lastPos = midPos - 1;
       } else if (key > keyList[midPos]) {
@@ -481,13 +506,13 @@ int vnodeBinarySearchKey(char *pValue, int num, TSKEY key, int order) {
         break;
       }
     }
-    
+
   } else {
     // find the first position which is bigger than the key
     while (1) {
       if (key <= keyList[firstPos]) return firstPos;
       if (key == keyList[lastPos]) return lastPos;
-      
+
       if (key > keyList[lastPos]) {
         lastPos = lastPos + 1;
         if (lastPos >= num)
@@ -495,10 +520,10 @@ int vnodeBinarySearchKey(char *pValue, int num, TSKEY key, int order) {
         else
           return lastPos;
       }
-      
+
       numOfPoints = lastPos - firstPos + 1;
       midPos = (numOfPoints >> 1) + firstPos;
-      
+
       if (key < keyList[midPos]) {
         lastPos = midPos - 1;
       } else if (key > keyList[midPos]) {
@@ -508,20 +533,22 @@ int vnodeBinarySearchKey(char *pValue, int num, TSKEY key, int order) {
       }
     }
   }
-  
+
   return midPos;
 }
 
 // only return the qualified data to client in terms of query time window, data rows in the same block but do not
 // be included in the query time window will be discarded
-static void filterDataInDataBlock(STsdbQueryHandle *pQueryHandle, SDataCols* pCols, SArray *sa) {
-  SQueryFilePos *cur = &pQueryHandle->cur;
-  STableCheckInfo* pCheckInfo = taosArrayGet(pQueryHandle->pTableCheckInfo, pQueryHandle->activeIndex);
-  SDataBlockInfo blockInfo = getTrueDataBlockInfo(pQueryHandle, pCheckInfo);
-  
+static void filterDataInDataBlock(STsdbQueryHandle* pQueryHandle, STableCheckInfo* pCheckInfo, SCompBlock* pBlock,
+                                  SArray* sa) {
+  SQueryFilePos* cur = &pQueryHandle->cur;
+  SDataBlockInfo blockInfo = getTrueDataBlockInfo(pCheckInfo, pBlock);
+
+  SDataCols* pCols = pCheckInfo->pDataCols;
+
   int32_t endPos = cur->pos;
   if (QUERY_IS_ASC_QUERY(pQueryHandle->order) && pQueryHandle->window.ekey > blockInfo.window.ekey) {
-    endPos = blockInfo.size - 1;
+    endPos = blockInfo.rows - 1;
     pQueryHandle->realNumOfRows = endPos - cur->pos + 1;
     pCheckInfo->lastKey = blockInfo.window.ekey + 1;
   } else if (!QUERY_IS_ASC_QUERY(pQueryHandle->order) && pQueryHandle->window.ekey < blockInfo.window.skey) {
@@ -529,8 +556,9 @@ static void filterDataInDataBlock(STsdbQueryHandle *pQueryHandle, SDataCols* pCo
     pQueryHandle->realNumOfRows = cur->pos + 1;
     pCheckInfo->lastKey = blockInfo.window.ekey - 1;
   } else {
-    endPos = vnodeBinarySearchKey(pCols->cols[0].pData, pCols->numOfPoints, pQueryHandle->window.ekey, pQueryHandle->order);
-    
+    endPos =
+        vnodeBinarySearchKey(pCols->cols[0].pData, pCols->numOfPoints, pQueryHandle->window.ekey, pQueryHandle->order);
+
     if (QUERY_IS_ASC_QUERY(pQueryHandle->order)) {
       if (endPos < cur->pos) {
         pQueryHandle->realNumOfRows = 0;
@@ -538,7 +566,7 @@ static void filterDataInDataBlock(STsdbQueryHandle *pQueryHandle, SDataCols* pCo
       } else {
         pQueryHandle->realNumOfRows = endPos - cur->pos;
       }
-  
+
       pCheckInfo->lastKey = ((int64_t*)(pCols->cols[0].pData))[endPos] + 1;
     } else {
       if (endPos > cur->pos) {
@@ -547,83 +575,84 @@ static void filterDataInDataBlock(STsdbQueryHandle *pQueryHandle, SDataCols* pCo
       } else {
         pQueryHandle->realNumOfRows = cur->pos - endPos;
       }
-      
+
       assert(0);
     }
   }
-  
+
   int32_t start = MIN(cur->pos, endPos);
-  
+
   // move the data block in the front to data block if needed
   int32_t numOfCols = QH_GET_NUM_OF_COLS(pQueryHandle);
-  
+
   for (int32_t i = 0; i < taosArrayGetSize(sa); ++i) {
-    int16_t colId = *(int16_t *)taosArrayGet(sa, i);
-    
+    int16_t colId = *(int16_t*)taosArrayGet(sa, i);
+
     for (int32_t j = 0; j < numOfCols; ++j) {
-      SColumnInfoEx *pCol = taosArrayGet(pQueryHandle->pColumns, j);
-      
+      SColumnInfoEx* pCol = taosArrayGet(pQueryHandle->pColumns, j);
+
       if (pCol->info.colId == colId) {
         SDataCol* pDataCol = &pCols->cols[i];
-        memmove(pCol->pData, pDataCol->pData + pCol->info.bytes * start, pQueryHandle->realNumOfRows * pCol->info.bytes);
+        memmove(pCol->pData, pDataCol->pData + pCol->info.bytes * start,
+                pQueryHandle->realNumOfRows * pCol->info.bytes);
         break;
       }
     }
   }
-  
-  assert(pQueryHandle->realNumOfRows <= blockInfo.size);
-  
+
+  assert(pQueryHandle->realNumOfRows <= blockInfo.rows);
+
   // forward(backward) the position for cursor
   cur->pos = endPos;
 }
 
-static SArray *getColumnIdList(STsdbQueryHandle *pQueryHandle) {
+static SArray* getColumnIdList(STsdbQueryHandle* pQueryHandle) {
   int32_t numOfCols = QH_GET_NUM_OF_COLS(pQueryHandle);
-  SArray *pIdList = taosArrayInit(numOfCols, sizeof(int16_t));
+  SArray* pIdList = taosArrayInit(numOfCols, sizeof(int16_t));
   for (int32_t i = 0; i < numOfCols; ++i) {
-    SColumnInfoEx *pCol = taosArrayGet(pQueryHandle->pColumns, i);
+    SColumnInfoEx* pCol = taosArrayGet(pQueryHandle->pColumns, i);
     taosArrayPush(pIdList, &pCol->info.colId);
   }
-  
+
   return pIdList;
 }
 
-SArray *getDefaultLoadColumns(STsdbQueryHandle *pQueryHandle, bool loadTS) {
-  SArray *pLocalIdList = getColumnIdList(pQueryHandle);
-  
+SArray* getDefaultLoadColumns(STsdbQueryHandle* pQueryHandle, bool loadTS) {
+  SArray* pLocalIdList = getColumnIdList(pQueryHandle);
+
   // check if the primary time stamp column needs to load
-  int16_t colId = *(int16_t *)taosArrayGet(pLocalIdList, 0);
-  
+  int16_t colId = *(int16_t*)taosArrayGet(pLocalIdList, 0);
+
   // the primary timestamp column does not be included in the the specified load column list, add it
   if (loadTS && colId != 0) {
     int16_t columnId = 0;
     taosArrayInsert(pLocalIdList, 0, &columnId);
   }
-  
+
   return pLocalIdList;
 }
 
-static int32_t binarySearchForKey(char *pValue, int num, TSKEY key, int order) {
+int32_t binarySearchForKey(char* pValue, int num, TSKEY key, int order) {
   int    firstPos, lastPos, midPos = -1;
   int    numOfPoints;
-  TSKEY *keyList;
-  
+  TSKEY* keyList;
+
   if (num <= 0) return -1;
-  
-  keyList = (TSKEY *)pValue;
+
+  keyList = (TSKEY*)pValue;
   firstPos = 0;
   lastPos = num - 1;
-  
+
   if (order == 0) {
     // find the first position which is smaller than the key
     while (1) {
       if (key >= keyList[lastPos]) return lastPos;
       if (key == keyList[firstPos]) return firstPos;
       if (key < keyList[firstPos]) return firstPos - 1;
-      
+
       numOfPoints = lastPos - firstPos + 1;
       midPos = (numOfPoints >> 1) + firstPos;
-      
+
       if (key < keyList[midPos]) {
         lastPos = midPos - 1;
       } else if (key > keyList[midPos]) {
@@ -632,13 +661,13 @@ static int32_t binarySearchForKey(char *pValue, int num, TSKEY key, int order) {
         break;
       }
     }
-    
+
   } else {
     // find the first position which is bigger than the key
     while (1) {
       if (key <= keyList[firstPos]) return firstPos;
       if (key == keyList[lastPos]) return lastPos;
-      
+
       if (key > keyList[lastPos]) {
         lastPos = lastPos + 1;
         if (lastPos >= num)
@@ -646,10 +675,10 @@ static int32_t binarySearchForKey(char *pValue, int num, TSKEY key, int order) {
         else
           return lastPos;
       }
-      
+
       numOfPoints = lastPos - firstPos + 1;
       midPos = (numOfPoints >> 1) + firstPos;
-      
+
       if (key < keyList[midPos]) {
         lastPos = midPos - 1;
       } else if (key > keyList[midPos]) {
@@ -659,513 +688,652 @@ static int32_t binarySearchForKey(char *pValue, int num, TSKEY key, int order) {
       }
     }
   }
-  
+
   return midPos;
 }
 
-static bool getQualifiedDataBlock(STsdbQueryHandle *pQueryHandle, STableCheckInfo* pCheckInfo, int32_t type) {
+static bool getQualifiedDataBlock(STsdbQueryHandle* pQueryHandle, STableCheckInfo* pCheckInfo, int32_t type) {
   STsdbFileH* pFileHandle = tsdbGetFile(pQueryHandle->pTsdb);
-  int32_t fid = getFileIdFromKey(pCheckInfo->lastKey);
-  
-  tsdbInitFileGroupIter(pFileHandle, &pCheckInfo->fileIter, TSDB_FGROUP_ITER_FORWARD);
-  tsdbSeekFileGroupIter(&pCheckInfo->fileIter, fid);
-  pCheckInfo->pFileGroup = tsdbGetFileGroupNext(&pCheckInfo->fileIter);
-  
+  int32_t     fid = getFileIdFromKey(pCheckInfo->lastKey);
+
+  tsdbInitFileGroupIter(pFileHandle, &pQueryHandle->fileIter, TSDB_FGROUP_ITER_FORWARD);
+  tsdbSeekFileGroupIter(&pQueryHandle->fileIter, fid);
+  pQueryHandle->pFileGroup = tsdbGetFileGroupNext(&pQueryHandle->fileIter);
+
   SQueryFilePos* cur = &pQueryHandle->cur;
-  
-  TSKEY key = pCheckInfo->lastKey;
-  int32_t index = -1;
 
   int32_t tid = pCheckInfo->tableId.tid;
-  
-  while (pCheckInfo->pFileGroup != NULL) {
-    if (getFileCompInfo(pCheckInfo, pCheckInfo->pFileGroup) != TSDB_CODE_SUCCESS) {
+  int32_t numOfBlocks = 0;
+
+  while (pQueryHandle->pFileGroup != NULL) {
+    if (getFileCompInfo(pQueryHandle, &numOfBlocks, 1) != TSDB_CODE_SUCCESS) {
       break;
     }
-  
+
+    assert(pCheckInfo->numOfBlocks >= 0);
+
     // no data block in current file, try next
-    if (pCheckInfo->compIndex[tid].numOfSuperBlocks == 0) {
-      dTrace("QInfo:%p no data block in file, fid:%d, tid:%d, try next", pQueryHandle->qinfo,
-          pCheckInfo->pFileGroup->fileId, tid);
-      
-      pCheckInfo->pFileGroup = tsdbGetFileGroupNext(&pCheckInfo->fileIter);
-      continue;
-    }
-    
-    index = binarySearchForBlockImpl(pCheckInfo->pCompInfo->blocks, pCheckInfo->compIndex[tid].numOfSuperBlocks, pQueryHandle->order, key);
-    
-    if (type == QUERY_RANGE_GREATER_EQUAL) {
-      if (key <= pCheckInfo->pCompInfo->blocks[index].keyLast) {
-        break;
-      } else {
-        index = -1;
-      }
-    } else {
-      if (key >= pCheckInfo->pCompInfo->blocks[index].keyFirst) {
-        break;
-      } else {
-        index = -1;
-      }
+    if (pCheckInfo->numOfBlocks > 0) {
+      cur->fid = pQueryHandle->pFileGroup->fileId;
+      break;
     }
+
+    dTrace("%p no data block in file, fid:%d, tid:%d, try next, %p", pQueryHandle, pQueryHandle->pFileGroup->fileId,
+           tid, pQueryHandle->qinfo);
+
+    pQueryHandle->pFileGroup = tsdbGetFileGroupNext(&pQueryHandle->fileIter);
   }
-  
-  // failed to find qualified point in file, abort
-  if (index == -1) {
+
+  if (pCheckInfo->numOfBlocks == 0) {
     return false;
   }
-  
-  assert(index >= 0 && index < pCheckInfo->compIndex[tid].numOfSuperBlocks);
-  
-  // load first data block into memory failed, caused by disk block error
-  bool blockLoaded = false;
-  SArray *sa = getDefaultLoadColumns(pQueryHandle, true);
-  
-  // todo no need to loaded at all
-  cur->slot = index;
-  
+
+  cur->slot = 0;  // always start from the first slot
   SCompBlock* pBlock = &pCheckInfo->pCompInfo->blocks[cur->slot];
-  SCompData*  data = calloc(1, sizeof(SCompData)+ sizeof(SCompCol)*pBlock->numOfCols);
-  
-  data->numOfCols = pBlock->numOfCols;
-  data->uid = pCheckInfo->pTableObj->tableId.uid;
-  
-  pCheckInfo->pDataCols = tdNewDataCols(1000, 2, 4096);
-  tdInitDataCols(pCheckInfo->pDataCols, pCheckInfo->pTableObj->schema);
-  
-  SFile* pFile = &pCheckInfo->pFileGroup->files[TSDB_FILE_TYPE_DATA];
-  if (pFile->fd == FD_INITIALIZER) {
-    pFile->fd = open(pFile->fname, O_RDONLY);
-  }
-  
-  if (tsdbLoadDataBlock(pFile, pBlock, 1, pCheckInfo->pDataCols, data) == 0) {
-    SDataBlockLoadInfo* pBlockLoadInfo = &pQueryHandle->dataBlockLoadInfo;
-    pBlockLoadInfo->fileGroup = pCheckInfo->pFileGroup;
-    pBlockLoadInfo->slot = pQueryHandle->cur.slot;
-    pBlockLoadInfo->sid = pCheckInfo->pTableObj->tableId.tid;
-    
-    blockLoaded = true;
-  }
-    
-    //    dError("QInfo:%p fileId:%d total numOfBlks:%d blockId:%d load into memory failed due to error in disk files",
-    //           GET_QINFO_ADDR(pQuery), pQuery->fileId, pQuery->numOfBlocks, blkIdx);
-  
-  // failed to load data from disk, abort current query
-  if (blockLoaded == false) {
-    taosArrayDestroy(sa);
-    tfree(data);
-    
-    return false;
-  }
-  
-  // todo search qualified points in blk, according to primary key (timestamp) column
-  SDataCols* pDataCols = pCheckInfo->pDataCols;
-  
-  TSKEY* d = (TSKEY*) pDataCols->cols[PRIMARYKEY_TIMESTAMP_COL_INDEX].pData;
-  assert(d[0] == pBlock->keyFirst && d[pBlock->numOfPoints - 1] == pBlock->keyLast);
-  
-  cur->pos = binarySearchForKey(pDataCols->cols[0].pData, pBlock->numOfPoints, key, pQueryHandle->order);
-  
-  cur->fid = pCheckInfo->pFileGroup->fileId;
-  assert(cur->pos >= 0 && cur->fid >= 0 && cur->slot >= 0);
-  
-  filterDataInDataBlock(pQueryHandle, pCheckInfo->pDataCols, sa);
-  
-  taosArrayDestroy(sa);
-  tfree(data);
-  return pQueryHandle->realNumOfRows > 0;
+  return loadFileDataBlock(pQueryHandle, pBlock, pCheckInfo);
 }
 
-static bool hasMoreDataInFileForSingleTableModel(STsdbQueryHandle* pHandle) {
+static UNUSED_FUNC bool hasMoreDataForSingleTable(STsdbQueryHandle* pHandle) {
   assert(pHandle->activeIndex == 0 && taosArrayGetSize(pHandle->pTableCheckInfo) == 1);
-  
-  STsdbFileH* pFileHandle = tsdbGetFile(pHandle->pTsdb);
+
+  STsdbFileH*      pFileHandle = tsdbGetFile(pHandle->pTsdb);
   STableCheckInfo* pCheckInfo = taosArrayGet(pHandle->pTableCheckInfo, pHandle->activeIndex);
-  
+
   if (!pCheckInfo->checkFirstFileBlock) {
     pCheckInfo->checkFirstFileBlock = true;
-    
+
     if (pFileHandle != NULL) {
       bool found = getQualifiedDataBlock(pHandle, pCheckInfo, 1);
       if (found) {
         return true;
       }
     }
-    
+
     // no data in file, try cache
     pHandle->cur.fid = -1;
-    return hasMoreDataInCacheForSingleModel(pHandle);
-  } else { // move to next data block in file or in cache
+    return hasMoreDataInCache(pHandle);
+  } else {  // move to next data block in file or in cache
     return moveToNextBlock(pHandle, 1);
   }
 }
 
-static bool hasMoreDataInCacheForMultiModel(STsdbQueryHandle* pHandle) {
-  size_t numOfTables = taosArrayGetSize(pHandle->pTableCheckInfo);
-  assert(numOfTables > 0);
-  
-  while(pHandle->activeIndex < numOfTables) {
-    STableCheckInfo* pTableCheckInfo = taosArrayGet(pHandle->pTableCheckInfo, pHandle->activeIndex);
-  
-    STable *pTable = pTableCheckInfo->pTableObj;
-    if (pTable->mem == NULL && pTable->imem == NULL) {
-      pHandle->activeIndex += 1;  // try next table if exits
-      continue;
+typedef struct SBlockOrderSupporter {
+  int32_t             numOfTables;
+  STableBlockInfo** pDataBlockInfo;
+  int32_t*            blockIndexArray;
+  int32_t*            numOfBlocksPerMeter;
+} SBlockOrderSupporter;
+
+void cleanBlockOrderSupporter(SBlockOrderSupporter* pSupporter, int32_t numOfTables) {
+  tfree(pSupporter->numOfBlocksPerMeter);
+  tfree(pSupporter->blockIndexArray);
+
+  for (int32_t i = 0; i < numOfTables; ++i) {
+    tfree(pSupporter->pDataBlockInfo[i]);
+  }
+
+  tfree(pSupporter->pDataBlockInfo);
+}
+
+static int32_t dataBlockOrderCompar(const void* pLeft, const void* pRight, void* param) {
+  int32_t leftTableIndex = *(int32_t*)pLeft;
+  int32_t rightTableIndex = *(int32_t*)pRight;
+
+  SBlockOrderSupporter* pSupporter = (SBlockOrderSupporter*)param;
+
+  int32_t leftTableBlockIndex = pSupporter->blockIndexArray[leftTableIndex];
+  int32_t rightTableBlockIndex = pSupporter->blockIndexArray[rightTableIndex];
+
+  if (leftTableBlockIndex > pSupporter->numOfBlocksPerMeter[leftTableIndex]) {
+    /* left block is empty */
+    return 1;
+  } else if (rightTableBlockIndex > pSupporter->numOfBlocksPerMeter[rightTableIndex]) {
+    /* right block is empty */
+    return -1;
+  }
+
+  STableBlockInfo* pLeftBlockInfoEx = &pSupporter->pDataBlockInfo[leftTableIndex][leftTableBlockIndex];
+  STableBlockInfo* pRightBlockInfoEx = &pSupporter->pDataBlockInfo[rightTableIndex][rightTableBlockIndex];
+
+  //    assert(pLeftBlockInfoEx->pBlock.compBlock->offset != pRightBlockInfoEx->pBlock.compBlock->offset);
+  if (pLeftBlockInfoEx->pBlock.compBlock->offset == pRightBlockInfoEx->pBlock.compBlock->offset &&
+      pLeftBlockInfoEx->pBlock.compBlock->last == pRightBlockInfoEx->pBlock.compBlock->last) {
+    // todo add more information
+    dError("error in header file, two block with same offset:%p", pLeftBlockInfoEx->pBlock.compBlock->offset);
+  }
+
+  return pLeftBlockInfoEx->pBlock.compBlock->offset > pRightBlockInfoEx->pBlock.compBlock->offset ? 1 : -1;
+}
+
+int32_t createDataBlocksInfo(STsdbQueryHandle* pQueryHandle, int32_t numOfBlocks, int32_t* numOfAllocBlocks) {
+  char* tmp = realloc(pQueryHandle->pDataBlockInfo, sizeof(STableBlockInfo) * numOfBlocks);
+  if (tmp == NULL) {
+    return TSDB_CODE_SERV_OUT_OF_MEMORY;
+  }
+
+  pQueryHandle->pDataBlockInfo = (STableBlockInfo*)tmp;
+  memset(pQueryHandle->pDataBlockInfo, 0, sizeof(STableBlockInfo) * numOfBlocks);
+  *numOfAllocBlocks = numOfBlocks;
+
+  int32_t numOfTables = taosArrayGetSize(pQueryHandle->pTableCheckInfo);
+
+  SBlockOrderSupporter sup = {0};
+  sup.numOfTables = numOfTables;
+  sup.numOfBlocksPerMeter = calloc(1, sizeof(int32_t) * numOfTables);
+  sup.blockIndexArray = calloc(1, sizeof(int32_t) * numOfTables);
+  sup.pDataBlockInfo = calloc(1, POINTER_BYTES * numOfTables);
+
+  if (sup.numOfBlocksPerMeter == NULL || sup.blockIndexArray == NULL || sup.pDataBlockInfo == NULL) {
+    cleanBlockOrderSupporter(&sup, 0);
+    return TSDB_CODE_SERV_OUT_OF_MEMORY;
+  }
+
+  int32_t cnt = 0;
+  int32_t numOfQualMeters = 0;
+  for (int32_t j = 0; j < numOfTables; ++j) {
+    STableCheckInfo* pTableCheck = (STableCheckInfo*)taosArrayGet(pQueryHandle->pTableCheckInfo, j);
+
+    SCompBlock* pBlock = pTableCheck->pCompInfo->blocks;
+    sup.numOfBlocksPerMeter[numOfQualMeters] = pTableCheck->numOfBlocks;
+
+    char* buf = calloc(1, sizeof(STableBlockInfo) * pTableCheck->numOfBlocks);
+    if (buf == NULL) {
+      cleanBlockOrderSupporter(&sup, numOfQualMeters);
+      return TSDB_CODE_SERV_OUT_OF_MEMORY;
+    }
+
+    sup.pDataBlockInfo[numOfQualMeters] = (STableBlockInfo*)buf;
+
+    for (int32_t k = 0; k < pTableCheck->numOfBlocks; ++k) {
+      STableBlockInfo* pBlockInfoEx = &sup.pDataBlockInfo[numOfQualMeters][k];
+
+      pBlockInfoEx->pBlock.compBlock = &pBlock[k];
+      pBlockInfoEx->pBlock.fields = NULL;
+
+      pBlockInfoEx->pTableCheckInfo = pTableCheck;
+      //      pBlockInfoEx->groupIdx = pTableCheckInfo[j]->groupIdx;     // set the group index
+      //      pBlockInfoEx->blockIndex = pTableCheckInfo[j]->start + k;    // set the block index in original meter
+      cnt++;
+    }
+
+    numOfQualMeters++;
+  }
+
+  dTrace("%p create data blocks info struct completed", pQueryHandle);
+
+  assert(cnt <= numOfBlocks && numOfQualMeters <= numOfTables);  // the pMeterDataInfo[j]->numOfBlocks may be 0
+  sup.numOfTables = numOfQualMeters;
+  SLoserTreeInfo* pTree = NULL;
+
+  uint8_t ret = tLoserTreeCreate(&pTree, sup.numOfTables, &sup, dataBlockOrderCompar);
+  if (ret != TSDB_CODE_SUCCESS) {
+    cleanBlockOrderSupporter(&sup, numOfTables);
+    return TSDB_CODE_SERV_OUT_OF_MEMORY;
+  }
+
+  int32_t numOfTotal = 0;
+
+  while (numOfTotal < cnt) {
+    int32_t pos = pTree->pNode[0].index;
+    int32_t index = sup.blockIndexArray[pos]++;
+
+    STableBlockInfo* pBlocksInfoEx = sup.pDataBlockInfo[pos];
+    pQueryHandle->pDataBlockInfo[numOfTotal++] = pBlocksInfoEx[index];
+
+    // set data block index overflow, in order to disable the offset comparator
+    if (sup.blockIndexArray[pos] >= sup.numOfBlocksPerMeter[pos]) {
+      sup.blockIndexArray[pos] = sup.numOfBlocksPerMeter[pos] + 1;
     }
+
+    tLoserTreeAdjust(pTree, pos + sup.numOfTables);
+  }
+
+  /*
+   * available when no import exists
+   * for(int32_t i = 0; i < cnt - 1; ++i) {
+   *   assert((*pDataBlockInfo)[i].pBlock.compBlock->offset < (*pDataBlockInfo)[i+1].pBlock.compBlock->offset);
+   * }
+   */
+
+  dTrace("%p %d data blocks sort completed", pQueryHandle, cnt);
+  cleanBlockOrderSupporter(&sup, numOfTables);
+  free(pTree);
+
+  return TSDB_CODE_SUCCESS;
+}
+
+static bool getDataBlocksInFiles(STsdbQueryHandle* pQueryHandle) {
+  STsdbFileH*    pFileHandle = tsdbGetFile(pQueryHandle->pTsdb);
+  SQueryFilePos* cur = &pQueryHandle->cur;
+
+  // find the start data block in file
+  if (!pQueryHandle->locateStart) {
+    pQueryHandle->locateStart = true;
+
+    int32_t fid = getFileIdFromKey(pQueryHandle->window.skey);
+
+    tsdbInitFileGroupIter(pFileHandle, &pQueryHandle->fileIter, TSDB_FGROUP_ITER_FORWARD);
+    tsdbSeekFileGroupIter(&pQueryHandle->fileIter, fid);
+
+    int32_t numOfBlocks = -1;
+    
+    // todo opt for only one table case
+    pQueryHandle->numOfBlocks = 0;
+    int32_t numOfTables = taosArrayGetSize(pQueryHandle->pTableCheckInfo);
+
+    while ((pQueryHandle->pFileGroup = tsdbGetFileGroupNext(&pQueryHandle->fileIter)) != NULL) {
+      if (getFileCompInfo(pQueryHandle, &numOfBlocks, 1) != TSDB_CODE_SUCCESS) {
+        break;
+      }
+
+      assert(numOfBlocks >= 0);
+      dTrace("%p %d blocks found in file for %d table(s), fid:%d", pQueryHandle, numOfBlocks,
+             pQueryHandle->pFileGroup->fileId, numOfTables);
+      
+      // todo return error code to query engine
+      if (createDataBlocksInfo(pQueryHandle, numOfBlocks, &pQueryHandle->numOfBlocks) != TSDB_CODE_SUCCESS) {
+        break;
+      }
   
-    // all data in mem are checked already.
-    if (pTableCheckInfo->lastKey > pTable->mem->keyLast) {
-      pHandle->activeIndex += 1;  // try next table if exits
-      continue;
+      assert(numOfBlocks >= pQueryHandle->numOfBlocks);
+      if (pQueryHandle->numOfBlocks > 0) {
+        break;
+      }
+    }
+
+    // no data in file anymore
+    if (pQueryHandle->numOfBlocks <= 0) {
+      assert(pQueryHandle->pFileGroup == NULL);
+      cur->fid = -1;
+      
+      return false;
     }
+
+    cur->slot = 0;
+    cur->fid = pQueryHandle->pFileGroup->fileId;
+
+    STableBlockInfo* pBlockInfo = &pQueryHandle->pDataBlockInfo[cur->slot];
+    STableCheckInfo* pCheckInfo = pBlockInfo->pTableCheckInfo;
+    SCompBlock*      pBlock = pBlockInfo->pBlock.compBlock;
     
-    return true;
-  }
+    return loadFileDataBlock(pQueryHandle, pBlock, pCheckInfo);
+  } else {
+    if (cur->slot == pQueryHandle->numOfBlocks - 1) { // all blocks
+      int32_t numOfBlocks = -1;
+      int32_t numOfTables = taosArrayGetSize(pQueryHandle->pTableCheckInfo);
+      pQueryHandle->numOfBlocks = 0;
+      
+      while ((pQueryHandle->pFileGroup = tsdbGetFileGroupNext(&pQueryHandle->fileIter)) != NULL) {
+        if (getFileCompInfo(pQueryHandle, &numOfBlocks, 1) != TSDB_CODE_SUCCESS) {
+          break;
+        }
+
+        assert(numOfBlocks >= 0);
+        dTrace("%p %d blocks found in file for %d table(s), fid:%d", pQueryHandle, numOfBlocks, numOfTables,
+               pQueryHandle->pFileGroup->fileId);
   
-  // all tables has checked already
-  return false;
+        // todo return error code to query engine
+        if (createDataBlocksInfo(pQueryHandle, numOfBlocks, &pQueryHandle->numOfBlocks) != TSDB_CODE_SUCCESS) {
+          break;
+        }
+        
+        assert(numOfBlocks >= pQueryHandle->numOfBlocks);
+        if (pQueryHandle->numOfBlocks > 0) {
+          break;
+        }
+      }
+
+      // no data in file anymore
+      if (pQueryHandle->numOfBlocks <= 0) {
+        assert(pQueryHandle->pFileGroup == NULL);
+        cur->fid = -1;
+        return false;
+      }
+
+      cur->slot = 0;
+      cur->fid = pQueryHandle->pFileGroup->fileId;
+      
+      STableBlockInfo* pBlockInfo = &pQueryHandle->pDataBlockInfo[cur->slot];
+
+      STableCheckInfo* pCheckInfo = pBlockInfo->pTableCheckInfo;
+      SCompBlock*      pBlock = pBlockInfo->pBlock.compBlock;
+      
+      return loadFileDataBlock(pQueryHandle, pBlock, pCheckInfo);
+    } else {  // next block of the same file
+      cur->slot += 1;
+      cur->pos = 0;
+
+      STableBlockInfo* pBlockInfo = &pQueryHandle->pDataBlockInfo[cur->slot];
+      return loadFileDataBlock(pQueryHandle, pBlockInfo->pBlock.compBlock, pBlockInfo->pTableCheckInfo);
+    }
+  }
 }
 
 // handle data in cache situation
-bool tsdbNextDataBlock(tsdb_query_handle_t *pQueryHandle) {
-  STsdbQueryHandle* pHandle = (STsdbQueryHandle*) pQueryHandle;
-  if (pHandle->model == SINGLE_TABLE_MODEL) {
-    return hasMoreDataInFileForSingleTableModel(pHandle);
+bool tsdbNextDataBlock(tsdb_query_handle_t* pQueryHandle) {
+  STsdbQueryHandle* pHandle = (STsdbQueryHandle*)pQueryHandle;
+  
+  size_t numOfTables = taosArrayGetSize(pHandle->pTableCheckInfo);
+  assert(numOfTables > 0);
+  
+  if (pHandle->checkFiles) {
+    if (getDataBlocksInFiles(pHandle)) {
+      return true;
+    }
+    
+    pHandle->activeIndex = 0;
+    pHandle->checkFiles = 0;
+    
+    while (pHandle->activeIndex < numOfTables) {
+      if (hasMoreDataInCache(pHandle)) {
+        return true;
+      }
+      
+      pHandle->activeIndex += 1;
+    }
+    
+    return false;
   } else {
-    return hasMoreDataInCacheForMultiModel(pHandle);
+    while (pHandle->activeIndex < numOfTables) {
+      if (hasMoreDataInCache(pHandle)) {
+        return true;
+      }
+      
+      pHandle->activeIndex += 1;
+    }
+    
+    return false;
   }
 }
 
-static int tsdbReadRowsFromCache(SSkipListIterator *pIter, TSKEY maxKey, int maxRowsToRead,
-    TSKEY* skey, TSKEY* ekey, STsdbQueryHandle* pHandle) {
-  int numOfRows = 0;
+static int tsdbReadRowsFromCache(SSkipListIterator* pIter, TSKEY maxKey, int maxRowsToRead, TSKEY* skey, TSKEY* ekey,
+                                 STsdbQueryHandle* pHandle) {
+  int     numOfRows = 0;
   int32_t numOfCols = taosArrayGetSize(pHandle->pColumns);
   *skey = INT64_MIN;
-  
-  while(tSkipListIterNext(pIter)) {
-    SSkipListNode *node = tSkipListIterGet(pIter);
+
+  while (tSkipListIterNext(pIter)) {
+    SSkipListNode* node = tSkipListIterGet(pIter);
     if (node == NULL) break;
-    
+
     SDataRow row = SL_GET_NODE_DATA(node);
     if (dataRowKey(row) > maxKey) break;
-    
+
     if (*skey == INT64_MIN) {
       *skey = dataRowKey(row);
     }
-    
+
     *ekey = dataRowKey(row);
-    
+
     int32_t offset = 0;
-    for(int32_t i = 0; i < numOfCols; ++i) {
+    for (int32_t i = 0; i < numOfCols; ++i) {
       SColumnInfoEx* pColInfo = taosArrayGet(pHandle->pColumns, i);
-      memcpy(pColInfo->pData + numOfRows*pColInfo->info.bytes, dataRowTuple(row) + offset, pColInfo->info.bytes);
+      memcpy(pColInfo->pData + numOfRows * pColInfo->info.bytes, dataRowTuple(row) + offset, pColInfo->info.bytes);
       offset += pColInfo->info.bytes;
     }
-    
+
     numOfRows++;
     if (numOfRows >= maxRowsToRead) break;
   };
-  
+
   return numOfRows;
 }
 
 // copy data from cache into data block
-SDataBlockInfo tsdbRetrieveDataBlockInfo(tsdb_query_handle_t *pQueryHandle) {
-  STsdbQueryHandle* pHandle = (STsdbQueryHandle*) pQueryHandle;
-  
-  STableCheckInfo* pCheckInfo = taosArrayGet(pHandle->pTableCheckInfo, pHandle->activeIndex);
-  STable *pTable = pCheckInfo->pTableObj;
-  
-  TSKEY skey = 0, ekey = 0;
+SDataBlockInfo tsdbRetrieveDataBlockInfo(tsdb_query_handle_t* pQueryHandle) {
+  STsdbQueryHandle* pHandle = (STsdbQueryHandle*)pQueryHandle;
+
+  STable* pTable = NULL;
+
+  TSKEY   skey = 0, ekey = 0;
   int32_t rows = 0;
-  
+
   // data in file
-  if (pHandle->cur.fid > 0) {
-    SDataBlockInfo binfo = getTrueDataBlockInfo(pHandle, pCheckInfo);
-    if (binfo.size == pHandle->realNumOfRows) {
+  if (pHandle->cur.fid >= 0) {
+    STableBlockInfo* pBlockInfo = &pHandle->pDataBlockInfo[pHandle->cur.slot];
+
+    pTable = pBlockInfo->pTableCheckInfo->pTableObj;
+
+    SDataBlockInfo binfo = getTrueDataBlockInfo(pBlockInfo->pTableCheckInfo, pBlockInfo->pBlock.compBlock);
+    if (binfo.rows == pHandle->realNumOfRows) {
+      pBlockInfo->pTableCheckInfo->lastKey = pBlockInfo->pBlock.compBlock->keyLast + 1;
       return binfo;
     } else {
       /* not a whole disk block, only the qualified rows, so this block is loaded in to buffer during the
        * block next function
        */
       SColumnInfoEx* pColInfoEx = taosArrayGet(pHandle->pColumns, 0);
-      
+
       rows = pHandle->realNumOfRows;
-      skey = *(TSKEY*) pColInfoEx->pData;
-      ekey = *(TSKEY*) ((char*)pColInfoEx->pData + TSDB_KEYSIZE * (rows - 1));
+      skey = *(TSKEY*)pColInfoEx->pData;
+      ekey = *(TSKEY*)((char*)pColInfoEx->pData + TSDB_KEYSIZE * (rows - 1));
+
+      // update the last key value
+      pBlockInfo->pTableCheckInfo->lastKey = ekey + 1;
     }
   } else {
+    STableCheckInfo* pCheckInfo = taosArrayGet(pHandle->pTableCheckInfo, pHandle->activeIndex);
+    pTable = pCheckInfo->pTableObj;
+
     if (pTable->mem != NULL) {
       // create mem table iterator if it is not created yet
       if (pCheckInfo->iter == NULL) {
         pCheckInfo->iter = tSkipListCreateIter(pTable->mem->pData);
       }
       rows = tsdbReadRowsFromCache(pCheckInfo->iter, INT64_MAX, 2, &skey, &ekey, pHandle);
+
+      // update the last key value
+      pCheckInfo->lastKey = ekey + 1;
     }
   }
-  
+
   SDataBlockInfo blockInfo = {
-    .uid = pTable->tableId.uid,
-    .sid = pTable->tableId.tid,
-    .size = rows,
-    .window = {.skey = skey, .ekey = ekey}
-  };
-  
-  // update the last key value
-  pCheckInfo->lastKey = ekey + 1;
+      .uid = pTable->tableId.uid, .sid = pTable->tableId.tid, .rows = rows, .window = {.skey = skey, .ekey = ekey}};
+
   return blockInfo;
 }
 
 // return null for data block in cache
-int32_t tsdbRetrieveDataBlockStatisInfo(tsdb_query_handle_t *pQueryHandle, SDataStatis **pBlockStatis) {
+int32_t tsdbRetrieveDataBlockStatisInfo(tsdb_query_handle_t* pQueryHandle, SDataStatis** pBlockStatis) {
   *pBlockStatis = NULL;
   return TSDB_CODE_SUCCESS;
 }
 
-SArray *tsdbRetrieveDataBlock(tsdb_query_handle_t *pQueryHandle, SArray *pIdList) {
+SArray* tsdbRetrieveDataBlock(tsdb_query_handle_t* pQueryHandle, SArray* pIdList) {
   /**
    * In the following two cases, the data has been loaded to SColumnInfoEx.
    * 1. data is from cache, 2. data block is not completed qualified to query time range
    */
-  STsdbQueryHandle* pHandle = (STsdbQueryHandle*) pQueryHandle;
-  
+  STsdbQueryHandle* pHandle = (STsdbQueryHandle*)pQueryHandle;
+
   if (pHandle->cur.fid < 0) {
     return pHandle->pColumns;
   } else {
-    STableCheckInfo* pCheckInfo = taosArrayGet(pHandle->pTableCheckInfo, pHandle->activeIndex);
-    
-    SDataBlockInfo binfo = getTrueDataBlockInfo(pHandle, pCheckInfo);
-    assert(pHandle->realNumOfRows <= binfo.size);
-    
-    if (pHandle->realNumOfRows < binfo.size) {
+    STableBlockInfo* pBlockInfoEx = &pHandle->pDataBlockInfo[pHandle->cur.slot];
+    STableCheckInfo*   pCheckInfo = pBlockInfoEx->pTableCheckInfo;
+
+    SDataBlockInfo binfo = getTrueDataBlockInfo(pCheckInfo, pBlockInfoEx->pBlock.compBlock);
+    assert(pHandle->realNumOfRows <= binfo.rows);
+
+    if (pHandle->realNumOfRows < binfo.rows) {
       return pHandle->pColumns;
     } else {
-      SArray *sa = getDefaultLoadColumns(pHandle, true);
-      
       // data block has been loaded, todo extract method
       SDataBlockLoadInfo* pBlockLoadInfo = &pHandle->dataBlockLoadInfo;
       if (pBlockLoadInfo->slot == pHandle->cur.slot && pBlockLoadInfo->sid == pCheckInfo->pTableObj->tableId.tid) {
         return pHandle->pColumns;
       } else {
-        doLoadDataFromFileBlock(pHandle);
-        filterDataInDataBlock(pHandle, pCheckInfo->pDataCols, sa);
-        
+        SCompBlock* pBlock = pBlockInfoEx->pBlock.compBlock;
+        doLoadFileDataBlock(pHandle, pBlock, pCheckInfo);
+
+        SArray* sa = getDefaultLoadColumns(pHandle, true);
+        filterDataInDataBlock(pHandle, pCheckInfo, pBlock, sa);
+        taosArrayDestroy(sa);
+
         return pHandle->pColumns;
       }
     }
   }
 }
 
-int32_t tsdbResetQuery(tsdb_query_handle_t *pQueryHandle, STimeWindow *window, tsdbpos_t position, int16_t order) {
+int32_t tsdbResetQuery(tsdb_query_handle_t* pQueryHandle, STimeWindow* window, tsdbpos_t position, int16_t order) {
   return 0;
 }
 
-int32_t tsdbDataBlockSeek(tsdb_query_handle_t *pQueryHandle, tsdbpos_t pos) { return 0;}
+int32_t tsdbDataBlockSeek(tsdb_query_handle_t* pQueryHandle, tsdbpos_t pos) { return 0; }
 
-tsdbpos_t tsdbDataBlockTell(tsdb_query_handle_t *pQueryHandle) { return NULL; }
+tsdbpos_t tsdbDataBlockTell(tsdb_query_handle_t* pQueryHandle) { return NULL; }
 
-SArray *tsdbRetrieveDataRow(tsdb_query_handle_t *pQueryHandle, SArray *pIdList, SQueryRowCond *pCond) { return NULL;}
+SArray* tsdbRetrieveDataRow(tsdb_query_handle_t* pQueryHandle, SArray* pIdList, SQueryRowCond* pCond) { return NULL; }
 
-tsdb_query_handle_t *tsdbQueryFromTagConds(STsdbQueryCond *pCond, int16_t stableId, const char *pTagFilterStr) {
+tsdb_query_handle_t* tsdbQueryFromTagConds(STsdbQueryCond* pCond, int16_t stableId, const char* pTagFilterStr) {
   return NULL;
 }
 
-SArray *tsdbGetTableList(tsdb_query_handle_t *pQueryHandle) { return NULL; }
+SArray* tsdbGetTableList(tsdb_query_handle_t* pQueryHandle) { return NULL; }
 
-static SArray* createTableIdArrayList(STsdbRepo* tsdb, int64_t uid) {
+static int32_t getAllTableIdList(STsdbRepo* tsdb, int64_t uid, SArray* list) {
   STable* pTable = tsdbGetTableByUid(tsdbGetMeta(tsdb), uid);
-  assert(pTable != NULL);  //assert pTable is a super table
-  
-  size_t size = tSkipListGetSize(pTable->pIndex);
-  SArray* pList = taosArrayInit(size, sizeof(STableId));
-  
+  assert(pTable != NULL);  // assert pTable is a super table
+
   SSkipListIterator* iter = tSkipListCreateIter(pTable->pIndex);
-  while(tSkipListIterNext(iter)) {
+  while (tSkipListIterNext(iter)) {
     SSkipListNode* pNode = tSkipListIterGet(iter);
-    STable* t = *(STable**) SL_GET_NODE_DATA(pNode);
-    
-    taosArrayPush(pList, &t->tableId);
+    STable*        t = *(STable**)SL_GET_NODE_DATA(pNode);
+
+    taosArrayPush(list, &t->tableId);
   }
-  
-  return pList;
+
+  return TSDB_CODE_SUCCESS;
 }
 
-typedef struct SSyntaxTreeFilterSupporter {
+typedef struct SExprTreeSupporter {
   SSchema* pTagSchema;
   int32_t  numOfTags;
   int32_t  optr;
-} SSyntaxTreeFilterSupporter;
+} SExprTreeSupporter;
 
 /**
- * convert the result pointer to STabObj instead of tSkipListNode
+ * convert the result pointer to table id instead of table object pointer
  * @param pRes
  */
-static UNUSED_FUNC void tansformQueryResult(SArray* pRes) {
-  if (pRes == NULL || taosArrayGetSize(pRes) == 0) {
+static void convertQueryResult(SArray* pRes, SArray* pTableList) {
+  if (pTableList == NULL || taosArrayGetSize(pTableList) == 0) {
     return;
   }
-  
-  size_t size = taosArrayGetSize(pRes);
+
+  size_t size = taosArrayGetSize(pTableList);
   for (int32_t i = 0; i < size; ++i) {
-//    pRes->pRes[i] = ((tSkipListNode*)(pRes->pRes[i]))->pData;
+    STable* pTable = taosArrayGetP(pTableList, i);
+    taosArrayPush(pRes, &pTable->tableId);
   }
 }
 
-void tSQLListTraverseDestroyInfo(void* param) {
+void destroyHelper(void* param) {
   if (param == NULL) {
     return;
   }
-  
+
   tQueryInfo* pInfo = (tQueryInfo*)param;
   tVariantDestroy(&(pInfo->q));
   free(param);
 }
 
-static char* convertTagQueryStr(const wchar_t* str, size_t len) {
-  char* mbs = NULL;
-  
-  if (len > 0) {
-    mbs = calloc(1, (len + 1) * TSDB_NCHAR_SIZE);
-    taosUcs4ToMbs((void*) str, len * TSDB_NCHAR_SIZE, mbs); //todo add log
-  }
-  
-  return mbs;
-}
-
-static int32_t compareStrVal(const void* pLeft, const void* pRight) {
-  int32_t ret = strcmp(pLeft, pRight);
-  if (ret == 0) {
-    return 0;
-  } else {
-    return ret > 0 ? 1 : -1;
-  }
-}
-
-static int32_t compareWStrVal(const void* pLeft, const void* pRight) {
-  int32_t ret = wcscmp(pLeft, pRight);
-  if (ret == 0) {
-    return 0;
-  } else {
-    return ret > 0 ? 1 : -1;
-  }
-}
-
-static int32_t compareIntVal(const void* pLeft, const void* pRight) {
-  DEFAULT_COMP(GET_INT64_VAL(pLeft), GET_INT64_VAL(pRight));
-}
-
-static int32_t compareIntDoubleVal(const void* pLeft, const void* pRight) {
-  DEFAULT_COMP(GET_INT64_VAL(pLeft), GET_DOUBLE_VAL(pRight));
-}
-
-static int32_t compareDoubleVal(const void* pLeft, const void* pRight) {
-  DEFAULT_COMP(GET_DOUBLE_VAL(pLeft), GET_DOUBLE_VAL(pRight));
-}
-
-static int32_t compareDoubleIntVal(const void* pLeft, const void* pRight) {
-  double ret = (*(double*)pLeft) - (*(int64_t*)pRight);
-  if (fabs(ret) < DBL_EPSILON) {
-    return 0;
-  } else {
-    return ret > 0 ? 1 : -1;
-  }
-}
-
-static int32_t compareStrPatternComp(const void* pLeft, const void* pRight) {
+static UNUSED_FUNC int32_t compareStrPatternComp(const void* pLeft, const void* pRight) {
   SPatternCompareInfo pInfo = {'%', '_'};
-  
+
   const char* pattern = pRight;
   const char* str = pLeft;
-  
+
   int32_t ret = patternMatch(pattern, str, strlen(str), &pInfo);
-  
+
   return (ret == TSDB_PATTERN_MATCH) ? 0 : 1;
 }
 
-static int32_t compareWStrPatternComp(const void* pLeft, const void* pRight) {
+static UNUSED_FUNC int32_t compareWStrPatternComp(const void* pLeft, const void* pRight) {
   SPatternCompareInfo pInfo = {'%', '_'};
-  
+
   const wchar_t* pattern = pRight;
   const wchar_t* str = pLeft;
-  
+
   int32_t ret = WCSPatternMatch(pattern, str, wcslen(str), &pInfo);
-  
+
   return (ret == TSDB_PATTERN_MATCH) ? 0 : 1;
 }
 
-static __compar_fn_t getFilterComparator(int32_t type, int32_t filterType, int32_t optr) {
-  __compar_fn_t comparator = NULL;
-  
-  switch (type) {
-    case TSDB_DATA_TYPE_TINYINT:
-    case TSDB_DATA_TYPE_SMALLINT:
-    case TSDB_DATA_TYPE_INT:
-    case TSDB_DATA_TYPE_BIGINT:
-    case TSDB_DATA_TYPE_BOOL: {
-      if (filterType >= TSDB_DATA_TYPE_BOOL && filterType <= TSDB_DATA_TYPE_BIGINT) {
-        comparator = compareIntVal;
-      } else if (filterType >= TSDB_DATA_TYPE_FLOAT && filterType <= TSDB_DATA_TYPE_DOUBLE) {
-        comparator = compareIntDoubleVal;
-      }
-      break;
-    }
-    
-    case TSDB_DATA_TYPE_FLOAT:
-    case TSDB_DATA_TYPE_DOUBLE: {
-      if (filterType >= TSDB_DATA_TYPE_BOOL && filterType <= TSDB_DATA_TYPE_BIGINT) {
-        comparator = compareDoubleIntVal;
-      } else if (filterType >= TSDB_DATA_TYPE_FLOAT && filterType <= TSDB_DATA_TYPE_DOUBLE) {
-        comparator = compareDoubleVal;
-      }
-      break;
-    }
-    
-    case TSDB_DATA_TYPE_BINARY: {
-      assert(filterType == TSDB_DATA_TYPE_BINARY);
-      
-      if (optr == TSDB_RELATION_LIKE) { /* wildcard query using like operator */
-        comparator = compareStrPatternComp;
-      } else { /* normal relational comparator */
-        comparator = compareStrVal;
-      }
-      
-      break;
-    }
-    
-    case TSDB_DATA_TYPE_NCHAR: {
-      assert(filterType == TSDB_DATA_TYPE_NCHAR);
-      
-      if (optr == TSDB_RELATION_LIKE) {
-        comparator = compareWStrPatternComp;
-      } else {
-        comparator = compareWStrVal;
-      }
-      
-      break;
-    }
-    default:
-      comparator = compareIntVal;
-      break;
-  }
-  
-  return comparator;
-}
+// static __compar_fn_t getFilterComparator(int32_t type, int32_t filterType, int32_t optr) {
+//  __compar_fn_t comparator = NULL;
+//
+//  switch (type) {
+//    case TSDB_DATA_TYPE_TINYINT:
+//    case TSDB_DATA_TYPE_SMALLINT:
+//    case TSDB_DATA_TYPE_INT:
+//    case TSDB_DATA_TYPE_BIGINT:
+//    case TSDB_DATA_TYPE_BOOL: {
+//      if (filterType >= TSDB_DATA_TYPE_BOOL && filterType <= TSDB_DATA_TYPE_BIGINT) {
+//        comparator = compareIntVal;
+//      } else if (filterType >= TSDB_DATA_TYPE_FLOAT && filterType <= TSDB_DATA_TYPE_DOUBLE) {
+//        comparator = compareIntDoubleVal;
+//      }
+//      break;
+//    }
+//
+//    case TSDB_DATA_TYPE_FLOAT:
+//    case TSDB_DATA_TYPE_DOUBLE: {
+//      if (filterType >= TSDB_DATA_TYPE_BOOL && filterType <= TSDB_DATA_TYPE_BIGINT) {
+//        comparator = compareDoubleIntVal;
+//      } else if (filterType >= TSDB_DATA_TYPE_FLOAT && filterType <= TSDB_DATA_TYPE_DOUBLE) {
+//        comparator = compareDoubleVal;
+//      }
+//      break;
+//    }
+//
+//    case TSDB_DATA_TYPE_BINARY: {
+//      assert(filterType == TSDB_DATA_TYPE_BINARY);
+//
+//      if (optr == TSDB_RELATION_LIKE) { /* wildcard query using like operator */
+//        comparator = compareStrPatternComp;
+//      } else { /* normal relational comparator */
+//        comparator = compareStrVal;
+//      }
+//
+//      break;
+//    }
+//
+//    case TSDB_DATA_TYPE_NCHAR: {
+//      assert(filterType == TSDB_DATA_TYPE_NCHAR);
+//
+//      if (optr == TSDB_RELATION_LIKE) {
+//        comparator = compareWStrPatternComp;
+//      } else {
+//        comparator = compareWStrVal;
+//      }
+//
+//      break;
+//    }
+//    default:
+//      comparator = compareIntVal;
+//      break;
+//  }
+//
+//  return comparator;
+//}
 
-static void getTagColumnInfo(SSyntaxTreeFilterSupporter* pSupporter, SSchema* pSchema, int32_t* index,
-                             int32_t* offset) {
+static void getTagColumnInfo(SExprTreeSupporter* pSupporter, SSchema* pSchema, int32_t* index, int32_t* offset) {
   *index = 0;
   *offset = 0;
-  
+
   // filter on table name(TBNAME)
   if (strcasecmp(pSchema->name, TSQL_TBNAME_L) == 0) {
     *index = TSDB_TBNAME_COLUMN_INDEX;
     *offset = TSDB_TBNAME_COLUMN_INDEX;
     return;
   }
-  
+
   while ((*index) < pSupporter->numOfTags) {
     if (pSupporter->pTagSchema[*index].bytes == pSchema->bytes &&
         pSupporter->pTagSchema[*index].type == pSchema->type &&
-        strcmp(pSupporter->pTagSchema[*index].name, pSchema->name) == 0) {
+        pSupporter->pTagSchema[*index].colId == pSchema->colId) {
       break;
     } else {
       (*offset) += pSupporter->pTagSchema[(*index)++].bytes;
@@ -1174,53 +1342,53 @@ static void getTagColumnInfo(SSyntaxTreeFilterSupporter* pSupporter, SSchema* pS
 }
 
 void filterPrepare(void* expr, void* param) {
-  tExprNode *pExpr = (tExprNode*) expr;
+  tExprNode* pExpr = (tExprNode*)expr;
   if (pExpr->_node.info != NULL) {
     return;
   }
-  
+
   int32_t i = 0, offset = 0;
   pExpr->_node.info = calloc(1, sizeof(tQueryInfo));
-  
+
   tQueryInfo* pInfo = pExpr->_node.info;
-  
-  SSyntaxTreeFilterSupporter* pSupporter = (SSyntaxTreeFilterSupporter*)param;
-  
+
+  SExprTreeSupporter* pSupporter = (SExprTreeSupporter*)param;
+
   tVariant* pCond = pExpr->_node.pRight->pVal;
   SSchema*  pSchema = pExpr->_node.pLeft->pSchema;
-  
+
   getTagColumnInfo(pSupporter, pSchema, &i, &offset);
   assert((i >= 0 && i < TSDB_MAX_TAGS) || (i == TSDB_TBNAME_COLUMN_INDEX));
   assert((offset >= 0 && offset < TSDB_MAX_TAGS_LEN) || (offset == TSDB_TBNAME_COLUMN_INDEX));
-  
+
   pInfo->sch = *pSchema;
-  pInfo->colIdx = i;
+  pInfo->colIndex = i;
   pInfo->optr = pExpr->_node.optr;
   pInfo->offset = offset;
-  pInfo->compare = getFilterComparator(pSchema->type, pCond->nType, pInfo->optr);
-  
+  //  pInfo->compare  = getFilterComparator(pSchema->type, pCond->nType, pInfo->optr);
+
   tVariantAssign(&pInfo->q, pCond);
   tVariantTypeSetType(&pInfo->q, pInfo->sch.type);
 }
 
 bool tSkipListNodeFilterCallback(const void* pNode, void* param) {
   tQueryInfo* pInfo = (tQueryInfo*)param;
-  
+
   STable* pTable = (STable*)(SL_GET_NODE_DATA((SSkipListNode*)pNode));
-  
-  char* val = dataRowTuple(pTable->tagVal);  // todo not only the first column
+
+  char*  val = dataRowTuple(pTable->tagVal);  // todo not only the first column
   int8_t type = pInfo->sch.type;
-  
+
   int32_t ret = 0;
   if (pInfo->q.nType == TSDB_DATA_TYPE_BINARY || pInfo->q.nType == TSDB_DATA_TYPE_NCHAR) {
     ret = pInfo->compare(val, pInfo->q.pz);
   } else {
     tVariant t = {0};
-    tVariantCreateFromBinary(&t, val, (uint32_t) pInfo->sch.bytes, type);
-    
+    tVariantCreateFromBinary(&t, val, (uint32_t)pInfo->sch.bytes, type);
+
     ret = pInfo->compare(&t.i64Key, &pInfo->q.i64Key);
   }
-  
+
   switch (pInfo->optr) {
     case TSDB_RELATION_EQUAL: {
       return ret == 0;
@@ -1228,10 +1396,10 @@ bool tSkipListNodeFilterCallback(const void* pNode, void* param) {
     case TSDB_RELATION_NOT_EQUAL: {
       return ret != 0;
     }
-    case TSDB_RELATION_LARGE_EQUAL: {
+    case TSDB_RELATION_GREATER_EQUAL: {
       return ret >= 0;
     }
-    case TSDB_RELATION_LARGE: {
+    case TSDB_RELATION_GREATER: {
       return ret > 0;
     }
     case TSDB_RELATION_LESS_EQUAL: {
@@ -1243,90 +1411,85 @@ bool tSkipListNodeFilterCallback(const void* pNode, void* param) {
     case TSDB_RELATION_LIKE: {
       return ret == 0;
     }
-    
+
     default:
       assert(false);
   }
   return true;
 }
 
-static int32_t doQueryTableList(STable* pSTable, SArray* pRes, const char* pCond) {
-//  STColumn* stcol = schemaColAt(pSTable->tagSchema, 0);
-  
-  tExprNode* pExpr = NULL;
-//  tSQLBinaryExprFromString(&pExpr, stcol, schemaNCols(pSTable->tagSchema), (char*) pCond, strlen(pCond));
-  
-  // failed to build expression, no result, return immediately
-  if (pExpr == NULL) {
-    mError("table:%" PRIu64 ", no result returned, error in super table query expression:%s", pSTable->tableId.uid, pCond);
-    tfree(pCond);
-    
-    return TSDB_CODE_OPS_NOT_SUPPORT;
-  }
-  
+static int32_t doQueryTableList(STable* pSTable, SArray* pRes, tExprNode* pExpr) {
   // query according to the binary expression
-//  SSyntaxTreeFilterSupporter s = {.pTagSchema = stcol, .numOfTags = schemaNCols(pSTable->tagSchema)};
-//
-//  SBinaryFilterSupp supp = {
-//      .fp = (__result_filter_fn_t)tSkipListNodeFilterCallback,
-//      .setupInfoFn = (__do_filter_suppl_fn_t)filterPrepare,
-//      .pExtInfo = &s
-//  };
-//
-//  tSQLBinaryExprTraverse(pExpr, pSTable->pIndex, pRes, &supp);
-//  tExprTreeDestroy(&pExpr, tSQLListTraverseDestroyInfo);
-//
-//  tansformQueryResult(pRes);
-  
+  STSchema* pSchema = pSTable->tagSchema;
+  SSchema*  schema = calloc(schemaNCols(pSchema), sizeof(SSchema));
+  for (int32_t i = 0; i < schemaNCols(pSchema); ++i) {
+    schema[i].colId = schemaColAt(pSchema, i)->colId;
+    schema[i].type = schemaColAt(pSchema, i)->type;
+    schema[i].bytes = schemaColAt(pSchema, i)->bytes;
+  }
+
+  SExprTreeSupporter s = {.pTagSchema = schema, .numOfTags = schemaNCols(pSTable->tagSchema)};
+
+  SBinaryFilterSupp supp = {
+      .fp = (__result_filter_fn_t)tSkipListNodeFilterCallback, .setupInfoFn = filterPrepare, .pExtInfo = &s};
+
+  SArray* pTableList = taosArrayInit(8, POINTER_BYTES);
+
+  tExprTreeTraverse(pExpr, pSTable->pIndex, pTableList, &supp);
+  tExprTreeDestroy(&pExpr, destroyHelper);
+
+  convertQueryResult(pRes, pTableList);
   return TSDB_CODE_SUCCESS;
 }
 
-SArray *tsdbQueryTableList(tsdb_repo_t* tsdb, int64_t uid, const wchar_t *pTagCond, size_t len) {
-  // no condition, all tables created according to the stable will involved in querying
-  SArray* result = taosArrayInit(8, POINTER_BYTES);
-  
-  if (pTagCond == NULL || wcslen(pTagCond) == 0) {
-    return createTableIdArrayList(tsdb, uid);
-  } else {
-    char* str = convertTagQueryStr(pTagCond, len);
-    
-    STable* pSTable = tsdbGetTableByUid(tsdbGetMeta(tsdb), uid);
-    assert(pSTable != NULL);
-    
-    doQueryTableList(pSTable, result, str);
-    return result;
+int32_t tsdbQueryTags(tsdb_repo_t* tsdb, int64_t uid, const char* pTagCond, size_t len, SArray* res) {
+  if (pTagCond == NULL || len == 0) {  // no condition, all tables created according to this stable are involved
+    return getAllTableIdList(tsdb, uid, res);
   }
+
+  STable* pSTable = tsdbGetTableByUid(tsdbGetMeta(tsdb), uid);
+  assert(pSTable != NULL);
+
+  tExprNode* pExprNode = NULL;
+  int32_t    ret = TSDB_CODE_SUCCESS;
+
+  // failed to build expression, no result, return immediately
+  if ((ret = exprTreeFromBinary(pTagCond, len, &pExprNode) != TSDB_CODE_SUCCESS) || (pExprNode == NULL)) {
+    dError("stable:%" PRIu64 ", failed to deserialize expression tree, error exists", uid);
+    return ret;
+  }
+
+  return doQueryTableList(pSTable, res, pExprNode);
 }
 
 void tsdbCleanupQueryHandle(tsdb_query_handle_t queryHandle) {
-  STsdbQueryHandle* pQueryHandle = (STsdbQueryHandle*) queryHandle;
-  
+  STsdbQueryHandle* pQueryHandle = (STsdbQueryHandle*)queryHandle;
+
   size_t size = taosArrayGetSize(pQueryHandle->pTableCheckInfo);
-  for(int32_t i = 0; i < size; ++i) {
+  for (int32_t i = 0; i < size; ++i) {
     STableCheckInfo* pTableCheckInfo = taosArrayGet(pQueryHandle->pTableCheckInfo, i);
     tSkipListDestroyIter(pTableCheckInfo->iter);
 
     if (pTableCheckInfo->pDataCols != NULL) {
       tfree(pTableCheckInfo->pDataCols->buf);
     }
-    
+
     tfree(pTableCheckInfo->pDataCols);
-    
+
     tfree(pTableCheckInfo->pCompInfo);
-    tfree(pTableCheckInfo->compIndex);
   }
-  
+
   taosArrayDestroy(pQueryHandle->pTableCheckInfo);
-  
+  tfree(pQueryHandle->compIndex);
+
   size_t cols = taosArrayGetSize(pQueryHandle->pColumns);
-  for(int32_t i = 0; i < cols; ++i) {
-    SColumnInfoEx *pColInfo = taosArrayGet(pQueryHandle->pColumns, i);
+  for (int32_t i = 0; i < cols; ++i) {
+    SColumnInfoEx* pColInfo = taosArrayGet(pQueryHandle->pColumns, i);
     tfree(pColInfo->pData);
   }
-  
+
   taosArrayDestroy(pQueryHandle->pColumns);
   
-  tfree(pQueryHandle->unzipBuffer);
-  tfree(pQueryHandle->secondaryUnzipBuffer);
+  tfree(pQueryHandle->pDataBlockInfo);
   tfree(pQueryHandle);
 }