diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index fa41ff8a3039d06a37d82df842201dcce265da10..8058d7f054b126fdc479c720ca0dc89d4766dff8 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -609,21 +609,21 @@ static int32_t tscEstimateQueryMsgSize(SSqlCmd *pCmd, int32_t clauseIndex) {
   return size;
 }
 
-static char *doSerializeTableInfo(SSqlObj *pSql, int32_t numOfTables, int32_t vnodeId, char *pMsg) {
+static char *doSerializeTableInfo(SSqlObj *pSql, int32_t numOfTables, int32_t vgId, char *pMsg) {
   STableMetaInfo *pTableMetaInfo = tscGetTableMetaInfoFromCmd(&pSql->cmd, pSql->cmd.clauseIndex, 0);
 
   STableMeta * pTableMeta = pTableMetaInfo->pTableMeta;
   SSuperTableMeta *pMetricMeta = pTableMetaInfo->pMetricMeta;
 
-  tscTrace("%p vid:%d, query on %d meters", pSql, vnodeId, numOfTables);
+  tscTrace("%p vgId:%d, query on %d tables", pSql, vgId, numOfTables);
   if (UTIL_TABLE_IS_NOMRAL_TABLE(pTableMetaInfo)) {
 #ifdef _DEBUG_VIEW
     tscTrace("%p sid:%d, uid:%" PRIu64, pSql, pTableMetaInfo->pTableMeta->sid, pTableMetaInfo->pTableMeta->uid);
 #endif
-    STableIdInfo *pTableMetaInfo = (STableIdInfo *)pMsg;
-    pTableMetaInfo->sid = htonl(pTableMeta->sid);
-    pTableMetaInfo->uid = htobe64(pTableMeta->uid);
-    pTableMetaInfo->key = htobe64(tscGetSubscriptionProgress(pSql->pSubscription, pTableMeta->uid));
+    STableIdInfo *pTableIdInfo = (STableIdInfo *)pMsg;
+    pTableIdInfo->sid = htonl(pTableMeta->sid);
+    pTableIdInfo->uid = htobe64(pTableMeta->uid);
+    pTableIdInfo->key = htobe64(tscGetSubscriptionProgress(pSql->pSubscription, pTableMeta->uid));
     pMsg += sizeof(STableIdInfo);
   } else {
     SVnodeSidList *pVnodeSidList = tscGetVnodeSidList(pMetricMeta, pTableMetaInfo->vnodeIndex);
@@ -676,6 +676,7 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
     pQueryMsg->uid = pTableMeta->uid;
     pQueryMsg->numOfTagsCols = 0;
     
+    pQueryMsg->vgId = htonl(pTableMeta->vgid);
     tscTrace("%p queried tables:%d, table id: %s", pSql, 1, pTableMetaInfo->name);
   } else {  // query on super table
     if (pTableMetaInfo->vnodeIndex < 0) {
@@ -693,7 +694,7 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
     }
 
     tscTrace("%p query on vid:%d, number of tables:%d", pSql, vnodeId, numOfTables);
-    pQueryMsg->vnode = htons(vnodeId);
+    pQueryMsg->vgId = htons(vnodeId);
   }
 
   pQueryMsg->numOfTables = htonl(numOfTables);
@@ -761,14 +762,14 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
     SColumnBase *pCol = tscColumnBaseInfoGet(&pQueryInfo->colList, i);
     SSchema *    pColSchema = &pSchema[pCol->colIndex.columnIndex];
 
-    if (pCol->colIndex.columnIndex >= tscGetNumOfColumns(pTableMeta) || pColSchema->type < TSDB_DATA_TYPE_BOOL ||
-        pColSchema->type > TSDB_DATA_TYPE_NCHAR) {
-      tscError("%p vid:%d sid:%d id:%s, column index out of range, numOfColumns:%d, index:%d, column name:%s", pSql,
-               htons(pQueryMsg->vnode), pTableMeta->sid, pTableMetaInfo->name, tscGetNumOfColumns(pTableMeta), pCol->colIndex,
-               pColSchema->name);
-
-      return -1;  // 0 means build msg failed
-    }
+//    if (pCol->colIndex.columnIndex >= tscGetNumOfColumns(pTableMeta) || pColSchema->type < TSDB_DATA_TYPE_BOOL ||
+//        pColSchema->type > TSDB_DATA_TYPE_NCHAR) {
+//      tscError("%p vid:%d sid:%d id:%s, column index out of range, numOfColumns:%d, index:%d, column name:%s", pSql,
+//               htons(pQueryMsg->vnode), pTableMeta->sid, pTableMetaInfo->name, tscGetNumOfColumns(pTableMeta), pCol->colIndex,
+//               pColSchema->name);
+//
+//      return -1;  // 0 means build msg failed
+//    }
 
     pQueryMsg->colList[i].colId = htons(pColSchema->colId);
     pQueryMsg->colList[i].bytes = htons(pColSchema->bytes);
@@ -862,7 +863,7 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
   pQueryMsg->colNameLen = htonl(len);
 
   // serialize the table info (sid, uid, tags)
-  pMsg = doSerializeTableInfo(pSql, numOfTables, htons(pQueryMsg->vnode), pMsg);
+  pMsg = doSerializeTableInfo(pSql, numOfTables, htons(pQueryMsg->vgId), pMsg);
 
   // only include the required tag column schema. If a tag is not required, it won't be sent to vnode
   if (pTableMetaInfo->numOfTags > 0) {
@@ -943,7 +944,9 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
   tscTrace("%p msg built success,len:%d bytes", pSql, msgLen);
   pCmd->payloadLen = msgLen;
   pSql->cmd.msgType = TSDB_MSG_TYPE_QUERY;
-
+  
+  pQueryMsg->contLen = htonl(msgLen);
+  
   assert(msgLen + minMsgSize() <= size);
 
   return TSDB_CODE_SUCCESS;
diff --git a/src/dnode/src/dnodeRead.c b/src/dnode/src/dnodeRead.c
index 8e6d20dba67c72007ed5fcc6dc0f4dd919b94249..b511a6bf088fef84b88adf16347a56ff022ce8a4 100644
--- a/src/dnode/src/dnodeRead.c
+++ b/src/dnode/src/dnodeRead.c
@@ -229,21 +229,23 @@ static void dnodeProcessQueryMsg(SReadMsg *pMsg) {
   SQueryTableMsg* pQueryTableMsg = (SQueryTableMsg*) pMsg->pCont;
   
   SQInfo* pQInfo = NULL;
-  int32_t ret = qCreateQueryInfo(pQueryTableMsg, &pQInfo);
+  int32_t code = qCreateQueryInfo(pQueryTableMsg, &pQInfo);
   
-  dTrace("query msg is disposed, qInfo:%p", pQueryTableMsg);
-
   SQueryTableRsp *pRsp = (SQueryTableRsp *) rpcMallocCont(sizeof(SQueryTableRsp));
-  pRsp->code    = 0;
+  pRsp->code    = code;
   pRsp->qhandle = htobe64((uint64_t) (pQInfo));
 
   SRpcMsg rpcRsp = {
       .handle = pMsg->rpcMsg.handle,
       .pCont = pRsp,
       .contLen = sizeof(SQueryTableRsp),
-      .code = 0,
+      .code = code,
       .msgType = 0
   };
+  
+  // do execute query
+  qTableQuery(pQInfo);
+  
   rpcSendResponse(&rpcRsp);
 }
 
@@ -252,21 +254,51 @@ static void dnodeProcessRetrieveMsg(SReadMsg *pMsg) {
   void *pQInfo = htobe64(pRetrieve->qhandle);
 
   dTrace("retrieve msg is disposed, qInfo:%p", pQInfo);
-
-  assert(pQInfo != NULL);
-  int32_t contLen = 100;
-  SRetrieveTableRsp *pRsp = (SRetrieveTableRsp *) rpcMallocCont(contLen);
-  pRsp->numOfRows = 0;
-  pRsp->precision = 0;
-  pRsp->offset    = 0;
-  pRsp->useconds  = 0;
-
-  SRpcMsg rpcRsp = {
-      .handle = pMsg->rpcMsg.handle,
-      .pCont = pRsp,
-      .contLen = contLen,
-      .code = 0,
-      .msgType = 0
-  };
+  
+  int32_t rowSize = 0;
+  int32_t numOfRows = 0;
+  int32_t contLen = 0;
+  
+  SRpcMsg rpcRsp = {0};
+  
+  int32_t code = qRetrieveQueryResultInfo(pQInfo, &numOfRows, &rowSize);
+  if (code != TSDB_CODE_SUCCESS) {
+    contLen = sizeof(SRetrieveTableRsp);
+    
+    SRetrieveTableRsp *pRsp = (SRetrieveTableRsp *)rpcMallocCont(contLen);
+    pRsp->numOfRows = 0;
+    pRsp->precision = 0;
+    pRsp->offset = 0;
+    pRsp->useconds = 0;
+  
+    rpcRsp = (SRpcMsg) {
+        .handle = pMsg->rpcMsg.handle,
+        .pCont = pRsp,
+        .contLen = contLen,
+        .code = code,
+        .msgType = 0
+    };
+    
+    //todo free qinfo
+  } else {
+    contLen = 100;
+    
+    SRetrieveTableRsp *pRsp = (SRetrieveTableRsp *)rpcMallocCont(contLen);
+    pRsp->numOfRows = 0;
+    pRsp->precision = 0;
+    pRsp->offset = 0;
+    pRsp->useconds = 0;
+
+    *(int64_t*) pRsp->data = 1000;
+    
+    rpcRsp = (SRpcMsg) {
+        .handle = pMsg->rpcMsg.handle,
+        .pCont = pRsp,
+        .contLen = contLen,
+        .code = code,
+        .msgType = 0
+    };
+  }
+  
   rpcSendResponse(&rpcRsp);
 }
diff --git a/src/inc/taosmsg.h b/src/inc/taosmsg.h
index 330e303f60db99dc93477a2b81c455ba85af7b91..d8a052c161697746f2d7acce9597d663d9002211 100644
--- a/src/inc/taosmsg.h
+++ b/src/inc/taosmsg.h
@@ -451,10 +451,10 @@ typedef struct STimeWindow {
  * the outputCols will be 3 while the numOfCols is 1.
  */
 typedef struct {
-  int16_t  vnode;
+  int32_t contLen;   // msg header
+  int16_t vgId;
+  
   int32_t  numOfTables;
-  uint64_t pSidExtInfo;  // table id & tag info ptr, in windows pointer may
-
   uint64_t uid;
   STimeWindow window;
 
diff --git a/src/query/CMakeLists.txt b/src/query/CMakeLists.txt
index 0984aeb585df2f00d23853c6c88498e8ca14b29a..0e51962f49999ae55c1c18aa5acd9d9baba64be7 100644
--- a/src/query/CMakeLists.txt
+++ b/src/query/CMakeLists.txt
@@ -11,5 +11,5 @@ INCLUDE_DIRECTORIES(inc)
 IF ((TD_LINUX_64) OR (TD_LINUX_32 AND TD_ARM))
   AUX_SOURCE_DIRECTORY(src SRC)
   ADD_LIBRARY(query ${SRC})
-  TARGET_LINK_LIBRARIES(query tutil m rt)
+  TARGET_LINK_LIBRARIES(query tsdb tutil m rt)
 ENDIF ()
\ No newline at end of file
diff --git a/src/query/inc/qextbuffer.h b/src/query/inc/qextbuffer.h
index 32df93d1e51693bbc900ece5e3c6f334aa8b97fb..598b809d92156c6fea1bcacd5dabafb89d4ee490 100644
--- a/src/query/inc/qextbuffer.h
+++ b/src/query/inc/qextbuffer.h
@@ -124,9 +124,8 @@ typedef struct tTagSchema {
 typedef struct tSidSet {
   int32_t            numOfSids;
   int32_t            numOfSubSet;
-  STableIdInfo **pSids;
+  STableIdInfo     **pTableIdList;
   int32_t *          starterPos;  // position of each subgroup, generated according to
-
   SColumnModel      *pColumnModel;
   SColumnOrderInfo   orderIdx;
 } tSidSet;
diff --git a/src/query/inc/queryExecutor.h b/src/query/inc/queryExecutor.h
index 6ff20affb00df71da3070badf5b24c57914f66b2..8956fb52b13e557ec5f1d36a7210cacff72a35e8 100644
--- a/src/query/inc/queryExecutor.h
+++ b/src/query/inc/queryExecutor.h
@@ -25,6 +25,7 @@
 #include "taosdef.h"
 #include "tref.h"
 #include "tsqlfunction.h"
+#include "tarray.h"
 
 typedef struct SData {
   int32_t num;
@@ -39,7 +40,7 @@ enum {
 
 struct SColumnFilterElem;
 typedef bool (*__filter_func_t)(struct SColumnFilterElem* pFilter, char* val1, char* val2);
-typedef int (*__block_search_fn_t)(char* data, int num, int64_t key, int order);
+typedef int32_t (*__block_search_fn_t)(char* data, int32_t num, int64_t key, int32_t order);
 
 typedef struct SSqlGroupbyExpr {
   int16_t     tableIndex;
@@ -142,7 +143,7 @@ typedef struct SQuery {
   int32_t           pos;
   int64_t           pointsOffset;  // the number of points offset to save read data
   SData**           sdata;
-
+  int32_t capacity;
   SSingleColumnFilterInfo* pFilterInfo;
 } SQuery;
 
@@ -152,7 +153,6 @@ typedef struct SQueryCostSummary {
 typedef struct SQueryRuntimeEnv {
   SResultInfo*       resultInfo;  // todo refactor to merge with SWindowResInfo
   SQuery*            pQuery;
-//  void*              pTabObj;
   SData**            pInterpoBuf;
   SQLFunctionCtx*    pCtx;
   int16_t            numOfRowsPerPage;
@@ -174,16 +174,17 @@ typedef struct SQInfo {
   TSKEY            startTime;
   int64_t          elapsedTime;
   SResultRec       rec;
-  int              pointsReturned;
-  int              pointsInterpo;
-  int              code;  // error code to returned to client
+  int32_t          pointsReturned;
+  int32_t          pointsInterpo;
+  int32_t          code;   // error code to returned to client
+  int32_t          killed; // denotes if current query is killed
   sem_t            dataReady;
-  SHashObj*        pTableList;  // table list
+  SArray*          pTableIdList;  // table list
   SQueryRuntimeEnv runtimeEnv;
   int32_t          subgroupIdx;
   int32_t          offset; /* offset in group result set of subgroup */
-  tSidSet*         pSidSet;
-
+//  tSidSet*         pSidSet;
+  
   T_REF_DECLARE()
   /*
    * the query is executed position on which meter of the whole list.
@@ -210,7 +211,7 @@ int32_t qCreateQueryInfo(SQueryTableMsg* pQueryTableMsg, SQInfo** pQInfo);
  * query on single table
  * @param pReadMsg
  */
-void qTableQuery(void* pReadMsg);
+void qTableQuery(SQInfo* pQInfo);
 
 /**
  * query on super table
@@ -218,4 +219,13 @@ void qTableQuery(void* pReadMsg);
  */
 void qSuperTableQuery(void* pReadMsg);
 
+/**
+ * wait for the query completed, and retrieve final results to client
+ * @param pQInfo
+ */
+int32_t qRetrieveQueryResultInfo(SQInfo* pQInfo, int32_t *numOfRows, int32_t* rowsize);
+
+
+//int32_t qBuildQueryResult(SQInfo* pQInfo, void* pBuf);
+
 #endif  // TDENGINE_QUERYEXECUTOR_H
diff --git a/src/query/src/queryExecutor.c b/src/query/src/queryExecutor.c
index 8672fb9c5e8ba19d0b046fb8311771906a98d920..0a5abccdd576710f69419298bc619a806efab143 100644
--- a/src/query/src/queryExecutor.c
+++ b/src/query/src/queryExecutor.c
@@ -12,18 +12,19 @@
  * 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/>.
  */
-#include <qast.h>
 #include "os.h"
 
+#include "taosmsg.h"
 #include "hash.h"
 #include "hashfunc.h"
-#include "taosmsg.h"
 #include "tlog.h"
 #include "tlosertree.h"
 #include "tscompression.h"
 #include "tstatus.h"
 #include "ttime.h"
 
+#include "qast.h"
+
 #include "qresultBuf.h"
 #include "queryExecutor.h"
 #include "queryUtil.h"
@@ -52,9 +53,9 @@
 
 /* get the qinfo struct address from the query struct address */
 #define GET_COLUMN_BYTES(query, colidx) \
-  ((query)->colList[(query)->pSelectExpr[colidx].pBase.colInfo.colIdxInBuf].data.bytes)
+  ((query)->colList[(query)->pSelectExpr[colidx].pBase.colInfo.colIdxInBuf].info.bytes)
 #define GET_COLUMN_TYPE(query, colidx) \
-  ((query)->colList[(query)->pSelectExpr[colidx].pBase.colInfo.colIdxInBuf].data.type)
+  ((query)->colList[(query)->pSelectExpr[colidx].pBase.colInfo.colIdxInBuf].info.type)
 
 typedef struct SPointInterpoSupporter {
   int32_t numOfCols;
@@ -1505,9 +1506,8 @@ static int32_t setupQueryRuntimeEnv(SQueryRuntimeEnv *pRuntimeEnv, SColumnModel
       pCtx->inputType = pSchema->type;
       pCtx->inputBytes = pSchema->bytes;
     } else {
-      assert(0);
-      //      pCtx->inputType = GET_COLUMN_TYPE(pQuery, i);
-      //      pCtx->inputBytes = GET_COLUMN_BYTES(pQuery, i);
+      pCtx->inputType = GET_COLUMN_TYPE(pQuery, i);
+      pCtx->inputBytes = GET_COLUMN_BYTES(pQuery, i);
     }
 
     pCtx->ptsOutputBuf = NULL;
@@ -1558,9 +1558,6 @@ static int32_t setupQueryRuntimeEnv(SQueryRuntimeEnv *pRuntimeEnv, SColumnModel
   }
 
   setCtxTagColumnInfo(pQuery, pRuntimeEnv->pCtx);
-
-  // for loading block data in memory
-  //  assert(vnodeList[pMeterObj->vnode].cfg.rowsInFileBlock == pMeterObj->pointsPerFileBlock);
   return TSDB_CODE_SUCCESS;
 
 _error_clean:
@@ -1893,8 +1890,7 @@ static void setScanLimitationByResultBuffer(SQuery *pQuery) {
 
     pQuery->checkBufferInLoop = hasMultioutput ? 1 : 0;
   }
-
-  assert(0);
+  
   //  pQuery->pointsOffset = pQuery->pointsToRead;
 }
 
@@ -2243,10 +2239,10 @@ static int32_t getInitialPageNum(SQInfo *pQInfo) {
   if (isGroupbyNormalCol(pQuery->pGroupbyExpr)) {
     num = 128;
   } else if (isIntervalQuery(pQuery)) {  // time window query, allocate one page for each table
-    size_t s = taosHashGetSize(pQInfo->pTableList);
+    size_t s = taosArrayGetSize(pQInfo->pTableIdList);
     num = MAX(s, INITIAL_RESULT_ROWS_VALUE);
   } else {  // for super table query, one page for each subset
-    num = pQInfo->pSidSet->numOfSubSet;
+//    num = pQInfo->pSidSet->numOfSubSet;
   }
 
   assert(num > 0);
@@ -2290,16 +2286,11 @@ void vnodeQueryFreeQInfoEx(SQInfo *pQInfo) {
 
   teardownQueryRuntimeEnv(&pQInfo->runtimeEnv);
 
-  if (pQInfo->pTableList != NULL) {
-    taosHashCleanup(pQInfo->pTableList);
-    pQInfo->pTableList = NULL;
-  }
-
   //  tSidSetDestroy(&pQInfo->pSidSet);
 
   if (pQInfo->pTableDataInfo != NULL) {
-    size_t num = taosHashGetSize(pQInfo->pTableList);
-    for (int32_t j = 0; j < num; ++j) {
+//    size_t num = taosHashGetSize(pQInfo->pTableIdList);
+    for (int32_t j = 0; j < 0; ++j) {
       destroyMeterQueryInfo(pQInfo->pTableDataInfo[j].pTableQInfo, pQuery->numOfOutputCols);
     }
   }
@@ -2337,11 +2328,11 @@ int32_t vnodeSTableQueryPrepare(SQInfo *pQInfo, SQuery *pQuery, void *param) {
   pQuery->lastKey = pQuery->window.skey;
 
   // create runtime environment
-  SColumnModel *pTagSchemaInfo = pQInfo->pSidSet->pColumnModel;
+//  SColumnModel *pTagSchemaInfo = pQInfo->pSidSet->pColumnModel;
 
   // get one queried meter
   assert(0);
-  //  SMeterObj *pMeter = getMeterObj(pQInfo->pTableList, pQInfo->pSidSet->pSids[0]->sid);
+  //  SMeterObj *pMeter = getMeterObj(pQInfo->pTableIdList, pQInfo->pSidSet->pTableIdList[0]->sid);
 
   pRuntimeEnv->pTSBuf = param;
   pRuntimeEnv->cur.vnodeIndex = -1;
@@ -2388,7 +2379,7 @@ int32_t vnodeSTableQueryPrepare(SQInfo *pQInfo, SQuery *pQuery, void *param) {
   SArray *sa = taosArrayInit(1, POINTER_BYTES);
 
   //  for(int32_t i = 0; i < pQInfo->pSidSet->numOfTables; ++i) {
-  //    SMeterObj *p1 = getMeterObj(pQInfo->pTableList, pQInfo->pSidSet->pSids[i]->sid);
+  //    SMeterObj *p1 = getMeterObj(pQInfo->pTableIdList, pQInfo->pSidSet->pTableIdList[i]->sid);
   //    taosArrayPush(sa, &p1);
   //  }
 
@@ -2418,7 +2409,7 @@ int32_t vnodeSTableQueryPrepare(SQInfo *pQInfo, SQuery *pQuery, void *param) {
  */
 void vnodeDecMeterRefcnt(SQInfo *pQInfo) {
   if (pQInfo != NULL) {
-    assert(taosHashGetSize(pQInfo->pTableList) >= 1);
+//    assert(taosHashGetSize(pQInfo->pTableIdList) >= 1);
   }
 
 #if 0
@@ -2429,7 +2420,7 @@ void vnodeDecMeterRefcnt(SQInfo *pQInfo) {
   } else {
     int32_t num = 0;
     for (int32_t i = 0; i < pQInfo->numOfMeters; ++i) {
-      SMeterObj *pMeter = getMeterObj(pQInfo->pTableList, pQInfo->pSidSet->pSids[i]->sid);
+      SMeterObj *pMeter = getMeterObj(pQInfo->pTableIdList, pQInfo->pSidSet->pTableIdList[i]->sid);
       atomic_fetch_sub_32(&(pMeter->numOfQueries), 1);
       
       if (pMeter->numOfQueries > 0) {
@@ -2592,15 +2583,72 @@ SArray *loadDataBlockOnDemand(SQueryRuntimeEnv *pRuntimeEnv, SDataBlockInfo *pBl
   return pDataBlock;
 }
 
+int32_t binarySearchForKey(char *pValue, int num, TSKEY key, int order) {
+  int    firstPos, lastPos, midPos = -1;
+  int    numOfPoints;
+  TSKEY *keyList;
+  
+  if (num <= 0) return -1;
+  
+  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]) {
+        firstPos = midPos + 1;
+      } else {
+        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)
+          return -1;
+        else
+          return lastPos;
+      }
+      
+      numOfPoints = lastPos - firstPos + 1;
+      midPos = (numOfPoints >> 1) + firstPos;
+      
+      if (key < keyList[midPos]) {
+        lastPos = midPos - 1;
+      } else if (key > keyList[midPos]) {
+        firstPos = midPos + 1;
+      } else {
+        break;
+      }
+    }
+  }
+  
+  return midPos;
+}
+
 static int64_t doScanAllDataBlocks(SQueryRuntimeEnv *pRuntimeEnv) {
-#if 0
   SQuery *pQuery = pRuntimeEnv->pQuery;
-  assert(0);
-//  __block_search_fn_t searchFn = vnodeSearchKeyFunc[pRuntimeEnv->pTabObj->searchAlgorithm];
-  
+
   int64_t cnt = 0;
-  dTrace("QInfo:%p query start, qrange:%" PRId64 "-%" PRId64 ", lastkey:%" PRId64 ", order:%d", GET_QINFO_ADDR(pQuery),
-         pQuery->window.skey, pQuery->window.ekey, pQuery->lastKey, pQuery->order.order);
+  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);
   
   tsdb_query_handle_t pQueryHandle = pRuntimeEnv->pQueryHandle;
   
@@ -2619,17 +2667,15 @@ static int64_t doScanAllDataBlocks(SQueryRuntimeEnv *pRuntimeEnv) {
       SWindowResInfo* pWindowResInfo = &pRuntimeEnv->windowResInfo;
       
       if (QUERY_IS_ASC_QUERY(pQuery)) {
-//        doGetAlignedIntervalQueryRangeImpl(pQuery, blockInfo.window.skey, blockInfo.window.skey,
-//                                           pQueryHandle->window.ekey, &skey1, &ekey1, &w);
+        doGetAlignedIntervalQueryRangeImpl(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, pQueryHandle->window.ekey,
-//                                           blockInfo.window.ekey, &skey1, &ekey1, &w);
+        doGetAlignedIntervalQueryRangeImpl(pQuery, winStart, pQuery->window.ekey, blockInfo.window.ekey, &skey1, &ekey1, &w);
         
-//        pWindowResInfo->startTime = pQueryHandle->window.skey;
+        pWindowResInfo->startTime = pQuery->window.skey;
         pWindowResInfo->prevSKey = w.skey;
       }
     }
@@ -2638,20 +2684,17 @@ static int64_t doScanAllDataBlocks(SQueryRuntimeEnv *pRuntimeEnv) {
     
     SDataStatis *pStatis = NULL;
     SArray *pDataBlock = loadDataBlockOnDemand(pRuntimeEnv, &blockInfo, &pStatis);
-//    int32_t forwardStep = tableApplyFunctionsOnBlock(pRuntimeEnv, &blockInfo, pStatis, searchFn, &numOfRes,
-//                                                     &pRuntimeEnv->windowResInfo, pDataBlock);
+    int32_t forwardStep = tableApplyFunctionsOnBlock(pRuntimeEnv, &blockInfo, pStatis, binarySearchForKey, &numOfRes,
+                                                     &pRuntimeEnv->windowResInfo, pDataBlock);
     
 //    dTrace("QInfo:%p check data block, brange:%" PRId64 "-%" PRId64 ", fileId:%d, slot:%d, pos:%d, rows:%d, checked:%d",
 //           GET_QINFO_ADDR(pQuery), blockInfo.window.skey, blockInfo.window.ekey, pQueryHandle->cur.fileId, pQueryHandle->cur.slot,
 //           pQuery->pos, blockInfo.size, forwardStep);
     
     // save last access position
-//    cnt += forwardStep;
-    
-//    if (queryPaused(pQuery, &blockInfo, forwardStep)) {
-//      if (Q_STATUS_EQUAL(pQuery->status, QUERY_RESBUF_FULL)) {
-//        break;
-//      }
+    cnt += forwardStep;
+    if (Q_STATUS_EQUAL(pQuery->status, QUERY_RESBUF_FULL)) {
+      break;
     }
   }
   
@@ -2673,8 +2716,6 @@ static int64_t doScanAllDataBlocks(SQueryRuntimeEnv *pRuntimeEnv) {
   }
   
   return cnt;
-#endif
-  return 0;
 }
 
 static void updatelastkey(SQuery *pQuery, STableQueryInfo *pTableQInfo) { pTableQInfo->lastKey = pQuery->lastKey; }
@@ -2935,29 +2976,29 @@ int32_t mergeMetersResultToOneGroups(SQInfo *pQInfo) {
   int64_t st = taosGetTimestampMs();
   int32_t ret = TSDB_CODE_SUCCESS;
 
-  while (pQInfo->subgroupIdx < pQInfo->pSidSet->numOfSubSet) {
-    int32_t start = pQInfo->pSidSet->starterPos[pQInfo->subgroupIdx];
-    int32_t end = pQInfo->pSidSet->starterPos[pQInfo->subgroupIdx + 1];
-
-    assert(0);
-    //    ret = doMergeMetersResultsToGroupRes(pQInfo, pQuery, pRuntimeEnv, pQInfo->pTableDataInfo, start, end);
-    if (ret < 0) {  // not enough disk space to save the data into disk
-      return -1;
-    }
-
-    pQInfo->subgroupIdx += 1;
-
-    // this group generates at least one result, return results
-    if (ret > 0) {
-      break;
-    }
-
-    assert(pQInfo->numOfGroupResultPages == 0);
-    dTrace("QInfo:%p no result in group %d, continue", GET_QINFO_ADDR(pQuery), pQInfo->subgroupIdx - 1);
-  }
-
-  dTrace("QInfo:%p merge res data into group, index:%d, total group:%d, elapsed time:%lldms", GET_QINFO_ADDR(pQuery),
-         pQInfo->subgroupIdx - 1, pQInfo->pSidSet->numOfSubSet, taosGetTimestampMs() - st);
+//  while (pQInfo->subgroupIdx < pQInfo->pSidSet->numOfSubSet) {
+//    int32_t start = pQInfo->pSidSet->starterPos[pQInfo->subgroupIdx];
+//    int32_t end = pQInfo->pSidSet->starterPos[pQInfo->subgroupIdx + 1];
+//
+//    assert(0);
+//    //    ret = doMergeMetersResultsToGroupRes(pQInfo, pQuery, pRuntimeEnv, pQInfo->pTableDataInfo, start, end);
+//    if (ret < 0) {  // not enough disk space to save the data into disk
+//      return -1;
+//    }
+//
+//    pQInfo->subgroupIdx += 1;
+//
+//    // this group generates at least one result, return results
+//    if (ret > 0) {
+//      break;
+//    }
+//
+//    assert(pQInfo->numOfGroupResultPages == 0);
+//    dTrace("QInfo:%p no result in group %d, continue", GET_QINFO_ADDR(pQuery), pQInfo->subgroupIdx - 1);
+//  }
+//
+//  dTrace("QInfo:%p merge res data into group, index:%d, total group:%d, elapsed time:%lldms", GET_QINFO_ADDR(pQuery),
+//         pQInfo->subgroupIdx - 1, pQInfo->pSidSet->numOfSubSet, taosGetTimestampMs() - st);
 
   return TSDB_CODE_SUCCESS;
 }
@@ -2972,10 +3013,10 @@ void copyResToQueryResultBuf(SQInfo *pQInfo, SQuery *pQuery) {
     }
 
     // set current query completed
-    if (pQInfo->numOfGroupResultPages == 0 && pQInfo->subgroupIdx == pQInfo->pSidSet->numOfSubSet) {
+//    if (pQInfo->numOfGroupResultPages == 0 && pQInfo->subgroupIdx == pQInfo->pSidSet->numOfSubSet) {
       //      pQInfo->tableIndex = pQInfo->pSidSet->numOfTables;
-      return;
-    }
+//      return;
+//    }
   }
 
   SQueryRuntimeEnv *   pRuntimeEnv = &pQInfo->runtimeEnv;
@@ -3282,7 +3323,7 @@ void disableFunctForSuppleScan(SQInfo *pQInfo, int32_t order) {
   }
 
   if (isIntervalQuery(pQuery)) {
-    size_t numOfTables = taosHashGetSize(pQInfo->pTableList);
+    size_t numOfTables = taosArrayGetSize(pQInfo->pTableIdList);
 
     for (int32_t i = 0; i < numOfTables; ++i) {
       STableQueryInfo *pTableQueryInfo = pQInfo->pTableDataInfo[i].pTableQInfo;
@@ -3320,7 +3361,6 @@ void createQueryResultInfo(SQuery *pQuery, SWindowResult *pResultRow, bool isSTa
 
 void resetCtxOutputBuf(SQueryRuntimeEnv *pRuntimeEnv) {
   SQuery *pQuery = pRuntimeEnv->pQuery;
-  //  int32_t rows = pRuntimeEnv->pTabObj->pointsPerFileBlock;
 
   for (int32_t i = 0; i < pQuery->numOfOutputCols; ++i) {
     SQLFunctionCtx *pCtx = &pRuntimeEnv->pCtx[i];
@@ -3339,8 +3379,7 @@ void resetCtxOutputBuf(SQueryRuntimeEnv *pRuntimeEnv) {
       pCtx->ptsOutputBuf = pRuntimeEnv->pCtx[0].aOutputBuf;
     }
 
-    assert(0);
-    //    memset(pQuery->sdata[i]->data, 0, (size_t)pQuery->pSelectExpr[i].resBytes * rows);
+    memset(pQuery->sdata[i]->data, 0, (size_t)pQuery->pSelectExpr[i].resBytes * pQuery->capacity);
   }
 
   initCtxOutputBuf(pRuntimeEnv);
@@ -3884,7 +3923,7 @@ static int32_t getNumOfSubset(SQInfo *pQInfo) {
   if (isGroupbyNormalCol(pQuery->pGroupbyExpr) || (isIntervalQuery(pQuery))) {
     totalSubset = numOfClosedTimeWindow(&pQInfo->runtimeEnv.windowResInfo);
   } else {
-    totalSubset = pQInfo->pSidSet->numOfSubSet;
+//    totalSubset = pQInfo->pSidSet->numOfSubSet;
   }
 
   return totalSubset;
@@ -4275,7 +4314,7 @@ int32_t vnodeQueryTablePrepare(SQInfo *pQInfo, void *param) {
            pQuery->window.ekey, pQuery->order.order);
 
     sem_post(&pQInfo->dataReady);
-    //    pQInfo->over = 1;
+    pQInfo->killed = 1;
     return TSDB_CODE_SUCCESS;
   }
 
@@ -4298,10 +4337,7 @@ int32_t vnodeQueryTablePrepare(SQInfo *pQInfo, void *param) {
     taosArrayPush(cols, &pQuery->colList[i]);
   }
 
-  SArray* sa = taosArrayInit(1, sizeof(int16_t));
-  taosArrayPush(sa, &pQInfo->pSidSet->pSids[0]->sid);
-  
-  pQInfo->runtimeEnv.pQueryHandle = tsdbQueryByTableId(&cond, sa, cols);
+  pQInfo->runtimeEnv.pQueryHandle = tsdbQueryByTableId(&cond, pQInfo->pTableIdList, cols);
 
   SQueryRuntimeEnv *pRuntimeEnv = &pQInfo->runtimeEnv;
   pRuntimeEnv->pQuery = pQuery;
@@ -4588,7 +4624,7 @@ static void vnodeSTableSeqProcessor(SQInfo *pQInfo) {
 
 #if 0
   SQuery* pQuery = pRuntimeEnv->pQuery;
-//  tSidSet *pSids = pSupporter->pSidSet;
+//  tSidSet *pTableIdList = pSupporter->pSidSet;
   
   int32_t vid = getMeterObj(pSupporter->pMetersHashTable, pMeterSidExtInfo[0]->sid)->vnode;
   
@@ -4597,12 +4633,12 @@ static void vnodeSTableSeqProcessor(SQInfo *pQInfo) {
     
     assert(pQuery->limit.offset == 0 && pQuery->limit.limit != 0);
     
-    while (pSupporter->subgroupIdx < pSids->numOfSubSet) {
-      int32_t start = pSids->starterPos[pSupporter->subgroupIdx];
-      int32_t end = pSids->starterPos[pSupporter->subgroupIdx + 1] - 1;
+    while (pSupporter->subgroupIdx < pTableIdList->numOfSubSet) {
+      int32_t start = pTableIdList->starterPos[pSupporter->subgroupIdx];
+      int32_t end = pTableIdList->starterPos[pSupporter->subgroupIdx + 1] - 1;
       
       if (isFirstLastRowQuery(pQuery)) {
-        dTrace("QInfo:%p last_row query on vid:%d, numOfGroups:%d, current group:%d", pQInfo, vid, pSids->numOfSubSet,
+        dTrace("QInfo:%p last_row query on vid:%d, numOfGroups:%d, current group:%d", pQInfo, vid, pTableIdList->numOfSubSet,
                pSupporter->subgroupIdx);
         
         TSKEY   key = -1;
@@ -4635,7 +4671,7 @@ static void vnodeSTableSeqProcessor(SQInfo *pQInfo) {
         int64_t num = doCheckMetersInGroup(pQInfo, index, start);
         assert(num >= 0);
       } else {
-        dTrace("QInfo:%p interp query on vid:%d, numOfGroups:%d, current group:%d", pQInfo, vid, pSids->numOfSubSet,
+        dTrace("QInfo:%p interp query on vid:%d, numOfGroups:%d, current group:%d", pQInfo, vid, pTableIdList->numOfSubSet,
                pSupporter->subgroupIdx);
         
         for (int32_t k = start; k <= end; ++k) {
@@ -4680,7 +4716,7 @@ static void vnodeSTableSeqProcessor(SQInfo *pQInfo) {
       }
     }
     
-    if (pSupporter->meterIdx >= pSids->numOfTables) {
+    if (pSupporter->meterIdx >= pTableIdList->numOfTables) {
       return;
     }
     
@@ -4833,7 +4869,7 @@ static void vnodeSTableSeqProcessor(SQInfo *pQInfo) {
   dTrace(
       "QInfo %p vid:%d, numOfMeters:%d, index:%d, numOfGroups:%d, %d points returned, totalRead:%d totalReturn:%d,"
       "next skey:%" PRId64 ", offset:%" PRId64,
-      pQInfo, vid, pSids->numOfTables, pSupporter->meterIdx, pSids->numOfSubSet, pQuery->pointsRead, pQInfo->pointsRead,
+      pQInfo, vid, pTableIdList->numOfTables, pSupporter->meterIdx, pTableIdList->numOfSubSet, pQuery->pointsRead, pQInfo->pointsRead,
       pQInfo->pointsReturned, pQuery->skey, pQuery->limit.offset);
 #endif
 }
@@ -4878,7 +4914,7 @@ static void doOrderedScan(SQInfo *pQInfo) {
 static void setupMeterQueryInfoForSupplementQuery(SQInfo *pQInfo) {
   SQuery *pQuery = pQInfo->runtimeEnv.pQuery;
 
-  int32_t num = taosHashGetSize(pQInfo->pTableList);
+  int32_t num = taosHashGetSize(pQInfo->pTableIdList);
   for (int32_t i = 0; i < num; ++i) {
     //    STableQueryInfo *pTableQueryInfo = pSupporter->pMeterDataInfo[i].pTableQInfo;
     //    changeMeterQueryInfoForSuppleQuery(pQuery, pTableQueryInfo, pSupporter->rawSKey, pSupporter->rawEKey);
@@ -5017,7 +5053,7 @@ static void vnodeMultiMeterQueryProcessor(SQInfo *pQInfo) {
  * select count(*)/top(field,k)/avg(field name) from table_name [where ts>now-1a];
  * select count(*) from table_name group by status_column;
  */
-static void vnodeSingleTableFixedOutputProcessor(SQInfo *pQInfo) {
+static void tableFixedOutputProcessor(SQInfo *pQInfo) {
   SQueryRuntimeEnv *pRuntimeEnv = &pQInfo->runtimeEnv;
   SQuery *          pQuery = pRuntimeEnv->pQuery;
 
@@ -5044,7 +5080,7 @@ static void vnodeSingleTableFixedOutputProcessor(SQInfo *pQInfo) {
   pQInfo->rec.pointsRead = pQuery->rec.pointsRead;
 }
 
-static void vnodeSingleTableMultiOutputProcessor(SQInfo *pQInfo) {
+static void tableMultiOutputProcessor(SQInfo *pQInfo) {
 #if 0
   SQuery *   pQuery = &pQInfo->query;
   SMeterObj *pMeterObj = pQInfo->pObj;
@@ -5148,7 +5184,7 @@ static void vnodeSingleMeterIntervalMainLooper(SQueryRuntimeEnv *pRuntimeEnv) {
 }
 
 /* handle time interval query on single table */
-static void vnodeSingleTableIntervalProcessor(SQInfo *pQInfo) {
+static void tableIntervalProcessor(SQInfo *pQInfo) {
   //  STable *pMeterObj = pQInfo->pObj;
 
   SQueryRuntimeEnv *pRuntimeEnv = &(pQInfo->runtimeEnv);
@@ -5212,31 +5248,18 @@ static void vnodeSingleTableIntervalProcessor(SQInfo *pQInfo) {
   //         pQInfo->pointsRead - pQInfo->pointsInterpo, pQInfo->pointsInterpo, pQInfo->pointsReturned);
 }
 
-void qTableQuery(void *pReadMsg) {
-  //  SQInfo *pQInfo = (SQInfo *)pReadMsg->ahandle;
-
-#if 0
-  if (pQInfo == NULL) {
-    dTrace("%p freed abort query", pQInfo);
+void qTableQuery(SQInfo* pQInfo) {
+  assert(pQInfo != NULL);
+  
+  if (pQInfo->killed) {
+    dTrace("QInfo:%p it is already killed, abort", pQInfo);
     return;
   }
   
-//  if (pQInfo->killed) {
-//    dTrace("QInfo:%p it is already killed, abort", pQInfo);
-//    vnodeDecRefCount(pQInfo);
-//
-//    return;
-//  }
-  
-//  assert(pQInfo->refCount >= 1);
-  
   SQueryRuntimeEnv *pRuntimeEnv = &pQInfo->runtimeEnv;
-  SQuery *          pQuery = &pRuntimeEnv->pQuery;
-  
-//  assert(pRuntimeEnv->pMeterObj == pMeterObj);
+  SQuery *pQuery = pRuntimeEnv->pQuery;
   
-//  dTrace("vid:%d sid:%d id:%s, query thread is created, numOfQueries:%d, QInfo:%p", pMeterObj->vnode, pMeterObj->sid,
-//         pMeterObj->meterId, pMeterObj->numOfQueries, pQInfo);
+//  dTrace("vid:%d sid:%d id:%s, query thread is created, numOfQueries:%d, QInfo:%p", pQInfo);
   
   if (vnodeHasRemainResults(pQInfo)) {
     /*
@@ -5254,15 +5277,9 @@ void qTableQuery(void *pReadMsg) {
     pQInfo->pointsInterpo += numOfInterpo;
     pQInfo->rec.pointsRead += pQuery->rec.pointsRead;
     
-//    dTrace(
-//        "QInfo:%p vid:%d sid:%d id:%s, %d points returned %d points interpo, totalRead:%d totalInterpo:%d "
-//        "totalReturn:%d",
-//        pQInfo, pMeterObj->vnode, pMeterObj->sid, pMeterObj->meterId, pQuery->pointsRead, numOfInterpo,
-//        pQInfo->pointsRead, pQInfo->pointsInterpo, pQInfo->pointsReturned);
-    
+//    dTrace("QInfo:%p %d points returned %d points interpo, totalRead:%d totalInterpo:%d totalReturn:%d",
+//        pQInfo, pQuery->pointsRead, numOfInterpo, pQInfo->pointsRead, pQInfo->pointsInterpo, pQInfo->pointsReturned);
     sem_post(&pQInfo->dataReady);
-//    vnodeDecRefCount(pQInfo);
-    
     return;
   }
   
@@ -5287,26 +5304,20 @@ void qTableQuery(void *pReadMsg) {
 //                 pQInfo->pointsInterpo, pQInfo->pointsReturned);
           
           sem_post(&pQInfo->dataReady);
-//          vnodeDecRefCount(pQInfo);
-          
           return;
         }
       }
     }
     
-    assert(0);
-//    pQInfo->over = 1;
 //    dTrace("QInfo:%p vid:%d sid:%d id:%s, query over, %d points are returned", pQInfo, pMeterObj->vnode, pMeterObj->sid,
 //           pMeterObj->meterId, pQInfo->pointsRead);
     
 //    vnodePrintQueryStatistics(pSupporter);
     sem_post(&pQInfo->dataReady);
-    
-//    vnodeDecRefCount(pQInfo);
     return;
   }
   
-  /* number of points returned during this query  */
+  // number of points returned during this query
   pQuery->rec.pointsRead = 0;
   
   int64_t st = taosGetTimestampUs();
@@ -5314,14 +5325,15 @@ void qTableQuery(void *pReadMsg) {
   // group by normal column, sliding window query, interval query are handled by interval query processor
   if (pQuery->intervalTime != 0 || isGroupbyNormalCol(pQuery->pGroupbyExpr)) {  // interval (down sampling operation)
 //    assert(pQuery->checkBufferInLoop == 0 && pQuery->pointsOffset == pQuery->pointsToRead);
-    vnodeSingleTableIntervalProcessor(pQInfo);
+    tableIntervalProcessor(pQInfo);
   } else {
     if (isFixedOutputQuery(pQuery)) {
       assert(pQuery->checkBufferInLoop == 0);
-      vnodeSingleTableFixedOutputProcessor(pQInfo);
+      
+      tableFixedOutputProcessor(pQInfo);
     } else {  // diff/add/multiply/subtract/division
       assert(pQuery->checkBufferInLoop == 1);
-      vnodeSingleTableMultiOutputProcessor(pQInfo);
+      tableMultiOutputProcessor(pQInfo);
     }
   }
   
@@ -5339,7 +5351,6 @@ void qTableQuery(void *pReadMsg) {
   
   sem_post(&pQInfo->dataReady);
 //  vnodeDecRefCount(pQInfo);
-#endif
 }
 
 void qSuperTableQuery(void *pReadMsg) {
@@ -5449,17 +5460,12 @@ static int32_t validateQueryMeterMsg(SQueryTableMsg *pQueryTableMsg) {
   return 0;
 }
 
-int32_t convertQueryTableMsg(SQueryTableMsg *pQueryTableMsg) {
-  pQueryTableMsg->vnode = htons(pQueryTableMsg->vnode);
+static int32_t convertQueryTableMsg(SQueryTableMsg *pQueryTableMsg, SArray** pTableIdList) {
+  pQueryTableMsg->vgId = htons(pQueryTableMsg->vgId);
   pQueryTableMsg->numOfTables = htonl(pQueryTableMsg->numOfTables);
-
-#ifdef TSKEY32
-  pQueryTableMsg->skey = htonl(pQueryTableMsg->skey);
-  pQueryTableMsg->ekey = htonl(pQueryTableMsg->ekey);
-#else
+  
   pQueryTableMsg->window.skey = htobe64(pQueryTableMsg->window.skey);
   pQueryTableMsg->window.ekey = htobe64(pQueryTableMsg->window.ekey);
-#endif
 
   pQueryTableMsg->order = htons(pQueryTableMsg->order);
   pQueryTableMsg->orderColId = htons(pQueryTableMsg->orderColId);
@@ -5477,17 +5483,17 @@ int32_t convertQueryTableMsg(SQueryTableMsg *pQueryTableMsg) {
 
   pQueryTableMsg->limit = htobe64(pQueryTableMsg->limit);
   pQueryTableMsg->offset = htobe64(pQueryTableMsg->offset);
+  
   pQueryTableMsg->tsOffset = htonl(pQueryTableMsg->tsOffset);
   pQueryTableMsg->tsLen = htonl(pQueryTableMsg->tsLen);
   pQueryTableMsg->tsNumOfBlocks = htonl(pQueryTableMsg->tsNumOfBlocks);
   pQueryTableMsg->tsOrder = htonl(pQueryTableMsg->tsOrder);
-
+  
   // query msg safety check
   if (validateQueryMeterMsg(pQueryTableMsg) != 0) {
     return TSDB_CODE_INVALID_QUERY_MSG;
   }
 
-  //  STableIdInfo **pSids = NULL;
   char *pMsg = (char *)(pQueryTableMsg->colList) + sizeof(SColumnInfo) * pQueryTableMsg->numOfCols;
 
   for (int32_t col = 0; col < pQueryTableMsg->numOfCols; ++col) {
@@ -5584,25 +5590,28 @@ int32_t convertQueryTableMsg(SQueryTableMsg *pQueryTableMsg) {
     pQueryTableMsg->colNameList = (int64_t)pMsg;
     pMsg += pQueryTableMsg->colNameLen;
   }
-
-  STableIdInfo **pSids = (STableIdInfo **)calloc(pQueryTableMsg->numOfTables, sizeof(STableIdInfo *));
-  pQueryTableMsg->pSidExtInfo = (uint64_t)pSids;
-
-  pSids[0] = (STableIdInfo *)pMsg;
-  pSids[0]->sid = htonl(pSids[0]->sid);
-  pSids[0]->uid = htobe64(pSids[0]->uid);
-  pSids[0]->key = htobe64(pSids[0]->key);
-
+  
+  *pTableIdList = taosArrayInit(pQueryTableMsg->numOfTables, sizeof(STableIdInfo));
+  
+  STableIdInfo* pTableIdInfo = (STableIdInfo *)pMsg;
+  pTableIdInfo->sid = htonl(pTableIdInfo->sid);
+  pTableIdInfo->uid = htobe64(pTableIdInfo->uid);
+  pTableIdInfo->key = htobe64(pTableIdInfo->key);
+  
+  taosArrayPush(*pTableIdList, pTableIdInfo);
+  pMsg += sizeof(STableIdInfo);
+  
   for (int32_t j = 1; j < pQueryTableMsg->numOfTables; ++j) {
-    pSids[j] = (STableIdInfo *)((char *)pSids[j - 1] + sizeof(STableIdInfo) + pQueryTableMsg->tagLength);
-    pSids[j]->sid = htonl(pSids[j]->sid);
-    pSids[j]->uid = htobe64(pSids[j]->uid);
-    pSids[j]->key = htobe64(pSids[j]->key);
+    pTableIdInfo = (STableIdInfo *)pMsg;
+    
+    pTableIdInfo->sid = htonl(pTableIdInfo->sid);
+    pTableIdInfo->uid = htobe64(pTableIdInfo->uid);
+    pTableIdInfo->key = htobe64(pTableIdInfo->key);
+    
+    taosArrayPush(*pTableIdList, pTableIdInfo);
+    pMsg += sizeof(STableIdInfo);
   }
 
-  pMsg = (char *)pSids[pQueryTableMsg->numOfTables - 1];
-  pMsg += sizeof(STableIdInfo) + pQueryTableMsg->tagLength;
-
   if (pQueryTableMsg->numOfGroupCols > 0 || pQueryTableMsg->numOfTagsCols > 0) {  // group by tag columns
     pQueryTableMsg->pTagSchema = (uint64_t)pMsg;
     SSchema *pTagSchema = (SSchema *)pQueryTableMsg->pTagSchema;
@@ -5698,9 +5707,10 @@ static int32_t buildAirthmeticExprFromMsg(SSqlFunctionExpr *pExpr, SQueryTableMs
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t createSqlFunctionExprFromMsg(SQueryTableMsg *pQueryMsg, SSqlFunctionExpr **pSqlFuncExpr) {
+static int32_t createSqlFunctionExprFromMsg(SQueryTableMsg *pQueryMsg, SSqlFunctionExpr **pSqlFuncExpr) {
   *pSqlFuncExpr = NULL;
-
+  int32_t code = TSDB_CODE_SUCCESS;
+  
   SSqlFunctionExpr *pExprs = (SSqlFunctionExpr *)calloc(1, sizeof(SSqlFunctionExpr) * pQueryMsg->numOfOutputCols);
   if (pExprs == NULL) {
     tfree(pQueryMsg->pSqlFuncExprs);
@@ -5732,24 +5742,24 @@ int32_t createSqlFunctionExprFromMsg(SQueryTableMsg *pQueryMsg, SSqlFunctionExpr
       bytes = pTagSchema[pColumnIndexExInfo->colIdx].bytes;
 
     } else {  // parse the arithmetic expression
-              //      if (pExprs[i].pBase.functionId == TSDB_FUNC_ARITHM) {
-              //        *code = buildAirthmeticExprFromMsg(&pExprs[i], pQueryMsg);
-              //
-              //        if (*code != TSDB_CODE_SUCCESS) {
-              //          tfree(pExprs);
-              //          return NULL;
-              //        }
-              //
-              //        type = TSDB_DATA_TYPE_DOUBLE;
-              //        bytes = tDataTypeDesc[type].nSize;
-              //      } else { // parse the normal column
-              //        int32_t j = getColumnIndexInSource(pQueryMsg, &pExprs[i].pBase);
-              //        assert(j < pQueryMsg->numOfCols);
-              //
-              //        SColumnInfo* pCol = &pQueryMsg->colList[j];
-              //        type = pCol->type;
-              //        bytes = pCol->bytes;
-              //      }
+      if (pExprs[i].pBase.functionId == TSDB_FUNC_ARITHM) {
+        code = buildAirthmeticExprFromMsg(&pExprs[i], pQueryMsg);
+
+        if (code != TSDB_CODE_SUCCESS) {
+          tfree(pExprs);
+          return code;
+        }
+
+        type = TSDB_DATA_TYPE_DOUBLE;
+        bytes = tDataTypeDesc[type].nSize;
+      } else { // parse the normal column
+        int32_t j = getColumnIndexInSource(pQueryMsg, &pExprs[i].pBase);
+        assert(j < pQueryMsg->numOfCols);
+
+        SColumnInfo* pCol = &pQueryMsg->colList[j];
+        type = pCol->type;
+        bytes = pCol->bytes;
+      }
     }
 
     int32_t param = pExprs[i].pBase.arg[0].argValue.i64;
@@ -5792,7 +5802,7 @@ int32_t createSqlFunctionExprFromMsg(SQueryTableMsg *pQueryMsg, SSqlFunctionExpr
   return TSDB_CODE_SUCCESS;
 }
 
-SSqlGroupbyExpr *createGroupbyExprFromMsg(SQueryTableMsg *pQueryMsg, int32_t *code) {
+static SSqlGroupbyExpr *createGroupbyExprFromMsg(SQueryTableMsg *pQueryMsg, int32_t *code) {
   if (pQueryMsg->numOfGroupCols == 0) {
     return NULL;
   }
@@ -5815,7 +5825,7 @@ SSqlGroupbyExpr *createGroupbyExprFromMsg(SQueryTableMsg *pQueryMsg, int32_t *co
   return pGroupbyExpr;
 }
 
-int32_t vnodeCreateFilterInfo(void *pQInfo, SQuery *pQuery) {
+static int32_t vnodeCreateFilterInfo(void *pQInfo, SQuery *pQuery) {
   for (int32_t i = 0; i < pQuery->numOfCols; ++i) {
     if (pQuery->colList[i].info.numOfFilters > 0) {
       pQuery->numOfFilterCols++;
@@ -5899,7 +5909,7 @@ int32_t vnodeCreateFilterInfo(void *pQInfo, SQuery *pQuery) {
   return TSDB_CODE_SUCCESS;
 }
 
-static SQInfo *createQInfoImpl(SQueryTableMsg *pQueryMsg, SSqlGroupbyExpr *pGroupbyExpr, SSqlFunctionExpr *pExprs) {
+static SQInfo *createQInfoImpl(SQueryTableMsg *pQueryMsg, SSqlGroupbyExpr *pGroupbyExpr, SSqlFunctionExpr *pExprs, SArray* pTableIdList) {
   SQInfo *pQInfo = (SQInfo *)calloc(1, sizeof(SQInfo));
   if (pQInfo == NULL) {
     goto _clean_memory;
@@ -5934,6 +5944,21 @@ static SQInfo *createQInfoImpl(SQueryTableMsg *pQueryMsg, SSqlGroupbyExpr *pGrou
   if (pQuery->colList == NULL) {
     goto _clean_memory;
   }
+  
+  for (int16_t i = 0; i < numOfCols; ++i) {
+    pQuery->colList[i].info = pQueryMsg->colList[i];
+//    SColumnInfo *pColInfo = &pQuery->colList[i].data;
+//    pColInfo->filters = NULL;
+//    if (colList[i].numOfFilters > 0) {
+//      pColInfo->filters = calloc(1, colList[i].numOfFilters * sizeof(SColumnFilterInfo));
+//
+//      for (int32_t j = 0; j < colList[i].numOfFilters; ++j) {
+//        tscColumnFilterInfoCopy(&pColInfo->filters[j], &colList[i].filters[j]);
+//      }
+//    } else {
+//      pQuery->colList[i].data.filters = NULL;
+//    }
+  }
 
   // calculate the result row size
   for (int16_t col = 0; col < numOfOutputCols; ++col) {
@@ -5952,13 +5977,13 @@ static SQInfo *createQInfoImpl(SQueryTableMsg *pQueryMsg, SSqlGroupbyExpr *pGrou
     goto _clean_memory;
   }
 
+  // set the output buffer capacity
+  pQuery->capacity = 4096;
   for (int32_t col = 0; col < pQuery->numOfOutputCols; ++col) {
     assert(pExprs[col].interResBytes >= pExprs[col].resBytes);
 
     // allocate additional memory for interResults that are usually larger then final results
-    //    size_t size = (pQInfo->query.pointsToRead + 1) * pExprs[col].resBytes + pExprs[col].interResBytes +
-    //    sizeof(SData);
-    size_t size = 1000;
+    size_t size = (pQuery->capacity + 1) * pExprs[col].resBytes + pExprs[col].interResBytes + sizeof(SData);
     pQuery->sdata[col] = (SData *)calloc(1, size);
     if (pQuery->sdata[col] == NULL) {
       goto _clean_memory;
@@ -5977,10 +6002,10 @@ static SQInfo *createQInfoImpl(SQueryTableMsg *pQueryMsg, SSqlGroupbyExpr *pGrou
 
   // to make sure third party won't overwrite this structure
   pQInfo->signature = (uint64_t)pQInfo;
+  pQInfo->pTableIdList = pTableIdList;
+  
   pQuery->pos = -1;
-
-  //  dTrace("vid:%d sid:%d meterId:%s, QInfo is allocated:%p", pMeterObj->vnode, pMeterObj->sid, pMeterObj->meterId,
-  //         pQInfo);
+  //  dTrace("vid:%d sid:%d meterId:%s, QInfo is allocated:%p", pMeterObj->vnode, pMeterObj->sid, pMeterObj->meterId, pQInfo);
 
   return pQInfo;
 
@@ -6005,28 +6030,107 @@ _clean_memory:
   return NULL;
 }
 
-int32_t createQInfo(SQueryTableMsg *pQueryMsg, SSqlGroupbyExpr *pGroupbyExpr, SSqlFunctionExpr *pSqlExprs,
-                                SQInfo **pQInfo) {
-  SQuery *pQuery;
+bool isQInfoValid(void *param) {
+  SQInfo *pQInfo = (SQInfo *)param;
+  if (pQInfo == NULL) {
+    return false;
+  }
+  
+  /*
+   * pQInfo->signature may be changed by another thread, so we assign value of signature
+   * into local variable, then compare by using local variable
+   */
+  uint64_t sig = pQInfo->signature;
+  return (sig == (uint64_t)pQInfo);
+}
+
+void vnodeFreeQInfo(SQInfo* pQInfo, bool decQueryRef) {
+  if (!isQInfoValid(pQInfo)) {
+    return;
+  }
+  
+  pQInfo->killed = 1;
+  dTrace("QInfo:%p start to free SQInfo", pQInfo);
+  
+  if (decQueryRef) {
+    vnodeDecMeterRefcnt(pQInfo);
+  }
+  
+  SQuery *pQuery = pQInfo->runtimeEnv.pQuery;
+  
+  for (int col = 0; col < pQuery->numOfOutputCols; ++col) {
+    tfree(pQuery->sdata[col]);
+  }
+  
+//  for (int col = 0; col < pQuery->numOfCols; ++col) {
+//    vnodeFreeColumnInfo(&pQuery->colList[col].data);
+//  }
+//
+//  if (pQuery->colList[0].colIdx != PRIMARYKEY_TIMESTAMP_COL_INDEX) {
+//    tfree(pQuery->tsData);
+//  }
+  
+  sem_destroy(&(pQInfo->dataReady));
+  vnodeQueryFreeQInfoEx(pQInfo);
+  
+  for (int32_t i = 0; i < pQuery->numOfFilterCols; ++i) {
+    SSingleColumnFilterInfo *pColFilter = &pQuery->pFilterInfo[i];
+    if (pColFilter->numOfFilters > 0) {
+      tfree(pColFilter->pFilters);
+    }
+  }
+  
+  tfree(pQuery->pFilterInfo);
+  tfree(pQuery->colList);
+  tfree(pQuery->sdata);
+  
+  if (pQuery->pSelectExpr != NULL) {
+    for (int32_t i = 0; i < pQuery->numOfOutputCols; ++i) {
+      SSqlBinaryExprInfo *pBinExprInfo = &pQuery->pSelectExpr[i].binExprInfo;
+      
+      if (pBinExprInfo->numOfCols > 0) {
+        tfree(pBinExprInfo->pReqColumns);
+        tSQLBinaryExprDestroy(&pBinExprInfo->pBinExpr, NULL);
+      }
+    }
+    
+    tfree(pQuery->pSelectExpr);
+  }
+  
+  if (pQuery->defaultVal != NULL) {
+    tfree(pQuery->defaultVal);
+  }
+  
+  tfree(pQuery->pGroupbyExpr);
+  tfree(pQuery);
+  
+//  dTrace("QInfo:%p vid:%d sid:%d meterId:%s, QInfo is freed", pQInfo, pObj->vnode, pObj->sid, pObj->meterId);
+  
+  //destroy signature, in order to avoid the query process pass the object safety check
+  memset(pQInfo, 0, sizeof(SQInfo));
+  tfree(pQInfo);
+}
+
+static int32_t createQInfo(SQueryTableMsg *pQueryMsg, SSqlGroupbyExpr *pGroupbyExpr, SSqlFunctionExpr *pSqlExprs,
+    SArray* pTableIdList, SQInfo **pQInfo) {
   int32_t code = TSDB_CODE_SUCCESS;
 
-  (*pQInfo) = createQInfoImpl(pQueryMsg, pGroupbyExpr, pSqlExprs);
+  (*pQInfo) = createQInfoImpl(pQueryMsg, pGroupbyExpr, pSqlExprs, pTableIdList);
   if (pQInfo == NULL) {
     code = TSDB_CODE_SERV_OUT_OF_MEMORY;
     goto _error;
   }
 
-  pQuery = (*pQInfo)->runtimeEnv.pQuery;
+  SQuery* pQuery = (*pQInfo)->runtimeEnv.pQuery;
   dTrace("qmsg:%p create QInfo:%p, QInfo created", pQueryMsg, pQInfo);
 
-  STableIdInfo **pSids = (STableIdInfo **)pQueryMsg->pSidExtInfo;
-  if (pSids != NULL && pSids[0]->key > 0) {
-    pQuery->window.skey = pSids[0]->key;
-  } else {
-    pQuery->window.skey = pQueryMsg->window.skey;
-  }
-
+//  STableIdInfo **pTableIdList = (STableIdInfo **)pQueryMsg->pSidExtInfo;
+//  if (pTableIdList != NULL && pTableIdList[0]->key > 0) {
+//    pQuery->window.skey = pTableIdList[0]->key;
+//  } else {
+  pQuery->window.skey = pQueryMsg->window.skey;
   pQuery->window.ekey = pQueryMsg->window.ekey;
+  
   pQuery->lastKey = pQuery->window.skey;
 
   if (sem_init(&(*pQInfo)->dataReady, 0, 0) != 0) {
@@ -6038,10 +6142,6 @@ int32_t createQInfo(SQueryTableMsg *pQueryMsg, SSqlGroupbyExpr *pGroupbyExpr, SS
 
   vnodeParametersSafetyCheck(pQuery);
 
-  (*pQInfo)->pTableList = taosHashInit(pQueryMsg->numOfTables, taosIntHash_32, false);
-  //  taosHashPut(pSupporter->pMetersHashTable, (const char *)&pMetersObj[0]->sid, sizeof(pMeterObj[0].sid),
-  //              (char *)&pMetersObj[0], POINTER_BYTES);
-
   STSBuf *pTSBuf = NULL;
   if (pQueryMsg->tsLen > 0) {  // open new file to save the result
     char *tsBlock = (char *)pQueryMsg + pQueryMsg->tsOffset;
@@ -6062,13 +6162,11 @@ int32_t createQInfo(SQueryTableMsg *pQueryMsg, SSqlGroupbyExpr *pGroupbyExpr, SS
 
   // dTrace("QInfo:%p set query flag and prepare runtime environment completed, ref:%d, wait for schedule", pQInfo,
   //       pQInfo->refCount);
-
-  // taosScheduleTask(queryQhandle, &schedMsg);
   return code;
   
 _error:
   // table query ref will be decrease during error handling
-  //    vnodeFreeQInfo(pQInfo, false);
+  vnodeFreeQInfo(*pQInfo, false);
   return code;
 }
 
@@ -6076,7 +6174,8 @@ int32_t qCreateQueryInfo(SQueryTableMsg *pQueryTableMsg, SQInfo **pQInfo) {
   assert(pQueryTableMsg != NULL);
 
   int32_t code = TSDB_CODE_SUCCESS;
-  if ((code = convertQueryTableMsg(pQueryTableMsg)) != TSDB_CODE_SUCCESS) {
+  SArray* pTableIdList = NULL;
+  if ((code = convertQueryTableMsg(pQueryTableMsg, &pTableIdList)) != TSDB_CODE_SUCCESS) {
     return code;
   }
 
@@ -6087,7 +6186,7 @@ int32_t qCreateQueryInfo(SQueryTableMsg *pQueryTableMsg, SQInfo **pQInfo) {
   }
 
   // todo check vnode status
-  if (pQueryTableMsg->pSidExtInfo == 0) {
+  if (pTableIdList == NULL || taosArrayGetSize(pTableIdList) == 0) {
     dError("qmsg:%p, SQueryTableMsg wrong format", pQueryTableMsg);
     code = TSDB_CODE_INVALID_QUERY_MSG;
     goto _query_over;
@@ -6106,10 +6205,14 @@ int32_t qCreateQueryInfo(SQueryTableMsg *pQueryTableMsg, SQInfo **pQInfo) {
   if (QUERY_IS_STABLE_QUERY(pQueryTableMsg->queryType)) {
     //    pObj->qhandle = vnodeQueryOnMultiMeters(pMeterObjList, pGroupbyExpr, pExprs, pQueryTableMsg, &code);
   } else {
-    code = createQInfo(pQueryTableMsg, pGroupbyExpr, pExprs, pQInfo);
+    code = createQInfo(pQueryTableMsg, pGroupbyExpr, pExprs, pTableIdList, pQInfo);
   }
 
 _query_over:
+  if (code != TSDB_CODE_SUCCESS) {
+    taosArrayDestroy(pTableIdList);
+  }
+  
   // if failed to add ref for all meters in this query, abort current query
   //  if (code != TSDB_CODE_SUCCESS) {
   //    vnodeDecQueryRefCount(pQueryTableMsg, pMeterObjList, incNumber);
@@ -6126,4 +6229,34 @@ _query_over:
   //
   //  atomic_fetch_add_32(&vnodeSelectReqNum, 1);
   return TSDB_CODE_SUCCESS;
-}
\ No newline at end of file
+}
+
+int32_t qRetrieveQueryResultInfo(SQInfo* pQInfo, int32_t *numOfRows, int32_t* rowsize) {
+  if (pQInfo == NULL || !isQInfoValid(pQInfo)) {
+    return TSDB_CODE_INVALID_QHANDLE;
+  }
+  
+  if (pQInfo->killed) {
+    dTrace("QInfo:%p query is killed, code:%d", pQInfo, pQInfo->code);
+    if (pQInfo->code == TSDB_CODE_SUCCESS) {
+      return TSDB_CODE_QUERY_CANCELLED;
+    } else { // in case of not TSDB_CODE_SUCCESS, return the code to client
+      return abs(pQInfo->code);
+    }
+  }
+  
+  sem_wait(&pQInfo->dataReady);
+  
+  SQuery* pQuery = pQInfo->runtimeEnv.pQuery;
+  
+//  *numOfRows = pQInfo->rec.pointsRead;
+//  *rowsize = pQuery->rowSize;
+  *numOfRows = 1;
+  
+//  dTrace("QInfo:%p, retrieve data info completed, precision:%d, rowsize:%d, rows:%d, code:%d", pQInfo, *timePrec,
+//         *rowsize, *numOfRows, pQInfo->code);
+  
+  if (pQInfo->code < 0) {  // less than 0 means there are error existed.
+    return -pQInfo->code;
+  }
+}
diff --git a/src/vnode/tsdb/src/tsdbRead.c b/src/vnode/tsdb/src/tsdbRead.c
index 36593e719a81cd58e6bf758356a2f958373a6e42..a62299c45fa83b7e021e2e91863e10eea9126046 100644
--- a/src/vnode/tsdb/src/tsdbRead.c
+++ b/src/vnode/tsdb/src/tsdbRead.c
@@ -16,3 +16,51 @@
 #include "os.h"
 #include "tsdb.h"
 
+tsdb_query_handle_t *tsdbQueryByTableId(STsdbQueryCond *pCond, SArray *idList, SArray *pColumnInfo) {
+
+}
+
+bool tsdbNextDataBlock(tsdb_query_handle_t *pQueryHandle) {
+  return false;
+}
+
+SDataBlockInfo tsdbRetrieveDataBlockInfo(tsdb_query_handle_t *pQueryHandle) {
+
+}
+
+int32_t tsdbRetrieveDataBlockStatisInfo(tsdb_query_handle_t *pQueryHandle, SDataStatis **pBlockStatis) {
+
+}
+
+SArray *tsdbRetrieveDataBlock(tsdb_query_handle_t *pQueryHandle, SArray *pIdList) {
+
+}
+
+int32_t tsdbResetQuery(tsdb_query_handle_t *pQueryHandle, STimeWindow* window, tsdbpos_t position, int16_t order) {
+
+}
+
+int32_t tsdbDataBlockSeek(tsdb_query_handle_t *pQueryHandle, tsdbpos_t pos) {
+
+}
+
+tsdbpos_t tsdbDataBlockTell(tsdb_query_handle_t *pQueryHandle) {
+  return NULL;
+}
+
+SArray *tsdbRetrieveDataRow(tsdb_query_handle_t *pQueryHandle, SArray *pIdList, SQueryRowCond *pCond) {
+
+}
+
+tsdb_query_handle_t *tsdbQueryFromTagConds(STsdbQueryCond *pCond, int16_t stableId, const char *pTagFilterStr) {
+
+}
+
+STableIDList *tsdbGetTableList(tsdb_query_handle_t *pQueryHandle) {
+
+}
+
+STableIDList *tsdbQueryTableList(int16_t stableId, const char *pTagCond) {
+
+}
+