Merge branch '2.0' into refact/rpc

0207d0eb · Jeff Tao · GitHub · 2eadeb93 · ba451bee · 0207d0eb
153 changed file
--- a/documentation/webdocs/markdowndocs/TAOS SQL-ch.md
+++ b/documentation/webdocs/markdowndocs/TAOS SQL-ch.md
@@ -191,9 +191,10 @@ TDengine缺省的时间戳是毫秒精度，但通过修改配置参数enableMic
    ```
    同时向表tb1_name和tb2_name中按列分别插入多条记录 

-注意：对同一张表，插入的新记录的时间戳必须递增，否则会跳过插入该条记录。如果时间戳为0，系统将自动使用服务器当前时间作为该记录的时间戳。
+注意：1、对同一张表，插入的新记录的时间戳必须递增，否则会跳过插入该条记录。如果时间戳为0，系统将自动使用服务器当前时间作为该记录的时间戳。
+      2、允许插入的最老记录的时间戳，是相对于当前服务器时间，减去配置的keep值（数据保留的天数），允许插入的最新记录的时间戳，是相对于当前服务器时间，加上配置的days值（数据文件存储数据的时间跨度，单位为天）。keep和days都是可以在创建数据库时指定的，缺省值分别是3650天和10天。

-**IMPORT**：如果需要将时间戳小于最后一条记录时间的记录写入到数据库中，可使用IMPORT替代INSERT命令，IMPORT的语法与INSERT完全一样。如果同时IMPORT多条记录，需要保证一批记录是按时间戳排序好的。
+**IMPORT**：如果需要将时间戳小于最后一条记录时间的记录写入到数据库中，可使用IMPORT替代INSERT命令，IMPORT的语法与INSERT完全一样。

 ## 数据查询


--- a/documentation/webdocs/markdowndocs/TAOS SQL.md
+++ b/documentation/webdocs/markdowndocs/TAOS SQL.md
@@ -181,9 +181,10 @@ All the keywords in a SQL statement are case-insensitive, but strings values are
                tb2_name (tb2_field1_name, ...) VALUES(field1_value1, ...) (field1_value2, ...)
    ```

-Note: For a table, the new record must have a timestamp bigger than the last data record, otherwise, it will be discarded and not inserted. If the timestamp is 0, the time stamp will be set to the system time on the server.
-
-**IMPORT**: If you do want to insert a historical data record into a table, use IMPORT command instead of INSERT. IMPORT has the same syntax as INSERT. If you want to import a batch of historical records, the records must be ordered by the timestamp, otherwise, TDengine won't handle it in the right way.
+Note: 1. For a table, the new record must have a timestamp bigger than the last data record, otherwise, it will be discarded and not inserted. If the timestamp is 0, the time stamp will be set to the system time on the server.
+      2.The timestamp of the oldest record allowed to be inserted is relative to the current server time, minus the configured keep value (the number of days the data is retained), and the timestamp of the latest record allowed to be inserted is relative to the current server time, plus the configured days value (the time span in which the data file stores data, in days). Both keep and days can be specified when creating the database. The default values are 3650 days and 10 days, respectively.
+ 
+**IMPORT**: If you do want to insert a historical data record into a table, use IMPORT command instead of INSERT. IMPORT has the same syntax as INSERT. 

 ## Data Query


--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -9,6 +9,6 @@ ADD_SUBDIRECTORY(kit)
 ADD_SUBDIRECTORY(plugins)
 ADD_SUBDIRECTORY(sdb)
 ADD_SUBDIRECTORY(mnode)
+ADD_SUBDIRECTORY(vnode)
 ADD_SUBDIRECTORY(dnode)
-#ADD_SUBDIRECTORY(vnode)
 #ADD_SUBDIRECTORY(connector/jdbc)
--- a/src/client/inc/tscSQLParser.h
+++ b/src/client/inc/tscSQLParser.h
@@ -86,15 +86,16 @@ enum _sql_cmd {
  TSDB_SQL_MAX   //48
 };

-#define MAX_TOKEN_LEN 30
-
-// token type
 enum {
  TSQL_NODE_TYPE_EXPR = 0x1,
  TSQL_NODE_TYPE_ID = 0x2,
  TSQL_NODE_TYPE_VALUE = 0x4,
 };

+#define NON_ARITHMEIC_EXPR 0
+#define NORMAL_ARITHMETIC 1
+#define AGG_ARIGHTMEIC    2
+
 extern char tTokenTypeSwitcher[13];

 #define toTSDBType(x)                          \
@@ -112,7 +113,7 @@ typedef struct SLimitVal {
 } SLimitVal;

 typedef struct SOrderVal {
-  int32_t order;
+  uint32_t order;
  int32_t orderColId;
 } SOrderVal;


--- a/src/client/inc/tscUtil.h
+++ b/src/client/inc/tscUtil.h
@@ -67,7 +67,7 @@ typedef struct SJoinSubquerySupporter {
 } SJoinSubquerySupporter;

 int32_t tscCreateDataBlock(size_t initialSize, int32_t rowSize, int32_t startOffset, const char* name,
-                           SMeterMeta* pMeterMeta, STableDataBlocks** dataBlocks);
+                           STableMeta* pMeterMeta, STableDataBlocks** dataBlocks);
 void    tscAppendDataBlock(SDataBlockList* pList, STableDataBlocks* pBlocks);
 void    tscDestroyDataBlock(STableDataBlocks* pDataBlock);

@@ -81,11 +81,11 @@ int32_t tscCopyDataBlockToPayload(SSqlObj* pSql, STableDataBlocks* pDataBlock);
 void    tscFreeUnusedDataBlocks(SDataBlockList* pList);
 int32_t tscMergeTableDataBlocks(SSqlObj* pSql, SDataBlockList* pDataList);
 int32_t tscGetDataBlockFromList(void* pHashList, SDataBlockList* pDataBlockList, int64_t id, int32_t size,
-                                int32_t startOffset, int32_t rowSize, const char* tableId, SMeterMeta* pMeterMeta,
+                                int32_t startOffset, int32_t rowSize, const char* tableId, STableMeta* pMeterMeta,
                                STableDataBlocks** dataBlocks);

-SVnodeSidList*    tscGetVnodeSidList(SMetricMeta* pMetricmeta, int32_t vnodeIdx);
-SMeterSidExtInfo* tscGetMeterSidInfo(SVnodeSidList* pSidList, int32_t idx);
+SVnodeSidList*    tscGetVnodeSidList(SSuperTableMeta* pMetricmeta, int32_t vnodeIdx);
+STableSidExtInfo* tscGetMeterSidInfo(SVnodeSidList* pSidList, int32_t idx);

 /**
 *
@@ -120,7 +120,7 @@ void    tscClearInterpInfo(SQueryInfo* pQueryInfo);
 bool tscIsInsertOrImportData(char* sqlstr);

 /* use for keep current db info temporarily, for handle table with db prefix */
-void tscGetDBInfoFromMeterId(char* meterId, char* db);
+void tscGetDBInfoFromMeterId(char* tableId, char* db);

 int tscAllocPayload(SSqlCmd* pCmd, int size);

@@ -128,6 +128,8 @@ void tscFieldInfoSetValFromSchema(SFieldInfo* pFieldInfo, int32_t index, SSchema
 void tscFieldInfoSetValFromField(SFieldInfo* pFieldInfo, int32_t index, TAOS_FIELD* pField);
 void tscFieldInfoSetValue(SFieldInfo* pFieldInfo, int32_t index, int8_t type, const char* name, int16_t bytes);
 void tscFieldInfoUpdateVisible(SFieldInfo* pFieldInfo, int32_t index, bool visible);
+void tscFieldInfoSetExpr(SFieldInfo* pFieldInfo, int32_t index, SSqlExpr* pExpr);
+void tscFieldInfoSetBinExpr(SFieldInfo* pFieldInfo, int32_t index, SSqlFunctionExpr* pExpr);

 void tscFieldInfoCalOffset(SQueryInfo* pQueryInfo);
 void tscFieldInfoUpdateOffsetForInterResult(SQueryInfo* pQueryInfo);
@@ -149,9 +151,10 @@ SSqlExpr* tscSqlExprInsertEmpty(SQueryInfo* pQueryInfo, int32_t index, int16_t f

 SSqlExpr* tscSqlExprUpdate(SQueryInfo* pQueryInfo, int32_t index, int16_t functionId, int16_t srcColumnIndex, int16_t type,
                           int16_t size);
+int32_t   tscSqlExprNumOfExprs(SQueryInfo* pQueryInfo);

 SSqlExpr* tscSqlExprGet(SQueryInfo* pQueryInfo, int32_t index);
-void      tscSqlExprCopy(SSqlExprInfo* dst, const SSqlExprInfo* src, uint64_t uid);
+void      tscSqlExprCopy(SSqlExprInfo* dst, const SSqlExprInfo* src, uint64_t uid, bool deepcopy);
 void*     tscSqlExprDestroy(SSqlExpr* pExpr);
 void      tscSqlExprInfoDestroy(SSqlExprInfo* pExprInfo);

@@ -196,7 +199,7 @@ int32_t tscGetQueryInfoDetailSafely(SSqlCmd *pCmd, int32_t subClauseIndex, SQuer
 SMeterMetaInfo* tscGetMeterMetaInfoByUid(SQueryInfo* pQueryInfo, uint64_t uid, int32_t* index);
 void            tscClearMeterMetaInfo(SMeterMetaInfo* pMeterMetaInfo, bool removeFromCache);

-SMeterMetaInfo* tscAddMeterMetaInfo(SQueryInfo* pQueryInfo, const char* name, SMeterMeta* pMeterMeta, SMetricMeta* pMetricMeta,
+SMeterMetaInfo* tscAddMeterMetaInfo(SQueryInfo* pQueryInfo, const char* name, STableMeta* pMeterMeta, SSuperTableMeta* pMetricMeta,
                                    int16_t numOfTags, int16_t* tags);
 SMeterMetaInfo* tscAddEmptyMeterMetaInfo(SQueryInfo *pQueryInfo);
 int32_t tscAddSubqueryInfo(SSqlCmd *pCmd);

--- a/src/client/inc/tsclient.h
+++ b/src/client/inc/tsclient.h
@@ -32,9 +32,8 @@ extern "C" {
 #include "tutil.h"
 #include "trpc.h"

-#define TSC_GET_RESPTR_BASE(res, _queryinfo, col, ord)                     \
-  (res->data + tscFieldInfoGetOffset(_queryinfo, col) * res->numOfRows)
-  
+#define TSC_GET_RESPTR_BASE(res, _queryinfo, col) (res->data + ((_queryinfo)->fieldsInfo.pSqlExpr[col]->offset) * res->numOfRows)
+
 // forward declaration
 struct SSqlInfo;

@@ -47,8 +46,8 @@ typedef struct SSqlGroupbyExpr {
 } SSqlGroupbyExpr;

 typedef struct SMeterMetaInfo {
-  SMeterMeta * pMeterMeta;   // metermeta
-  SMetricMeta *pMetricMeta;  // metricmeta
+  STableMeta * pMeterMeta;   // metermeta
+  SSuperTableMeta *pMetricMeta;  // metricmeta

  /*
   * 1. keep the vnode index during the multi-vnode super table projection query
@@ -71,13 +70,19 @@ typedef struct SSqlExpr {
  int16_t     interResBytes;  // inter result buffer size
  int16_t     numOfParams;    // argument value of each function
  tVariant    param[3];       // parameters are not more than 3
+  int32_t     offset;         // sub result column value of arithmetic expression.
 } SSqlExpr;

+typedef struct SColumnIndex {
+  int16_t tableIndex;
+  int16_t columnIndex;
+} SColumnIndex;
+
 typedef struct SFieldInfo {
  int16_t     numOfOutputCols;  // number of column in result
  int16_t     numOfAlloc;       // allocated size
  TAOS_FIELD *pFields;
-  short *     pOffset;
+//  short *     pOffset;

  /*
   * define if this column is belong to the queried result, it may be add by parser to faciliate
@@ -86,20 +91,17 @@ typedef struct SFieldInfo {
   * NOTE: these hidden columns always locate at the end of the output columns
   */
  bool *  pVisibleCols;
-  int32_t numOfHiddenCols;  // the number of column not belongs to the queried result columns
+  int32_t numOfHiddenCols;   // the number of column not belongs to the queried result columns
+  SSqlFunctionExpr** pExpr;  // used for aggregation arithmetic express,such as count(*)+count(*)
+  SSqlExpr** pSqlExpr;
 } SFieldInfo;

 typedef struct SSqlExprInfo {
-  int16_t   numOfAlloc;
-  int16_t   numOfExprs;
-  SSqlExpr *pExprs;
+  int16_t    numOfAlloc;
+  int16_t    numOfExprs;
+  SSqlExpr** pExprs;
 } SSqlExprInfo;

-typedef struct SColumnIndex {
-  int16_t tableIndex;
-  int16_t columnIndex;
-} SColumnIndex;
-
 typedef struct SColumnBase {
  SColumnIndex       colIndex;
  int32_t            numOfFilters;
@@ -120,7 +122,7 @@ typedef struct SCond {
 } SCond;

 typedef struct SJoinNode {
-  char     meterId[TSDB_TABLE_ID_LEN];
+  char     tableId[TSDB_TABLE_ID_LEN];
  uint64_t uid;
  int16_t  tagCol;
 } SJoinNode;
@@ -155,23 +157,23 @@ typedef struct SParamInfo {
 } SParamInfo;

 typedef struct STableDataBlocks {
-  char    meterId[TSDB_TABLE_ID_LEN];
+  char    tableId[TSDB_TABLE_ID_LEN];
  int8_t  tsSource;     // where does the UNIX timestamp come from, server or client
  bool    ordered;      // if current rows are ordered or not
  int64_t vgid;         // virtual group id
  int64_t prevTS;       // previous timestamp, recorded to decide if the records array is ts ascending
-  int32_t numOfMeters;  // number of tables in current submit block
+  int32_t numOfTables;  // number of tables in current submit block

  int32_t  rowSize;  // row size for current table
  uint32_t nAllocSize;
-  uint32_t headerSize;    // header for metadata (submit metadata)
+  uint32_t headerSize;  // header for metadata (submit metadata)
  uint32_t size;

  /*
   * the metermeta for current table, the metermeta will be used during submit stage, keep a ref
   * to avoid it to be removed from cache
   */
-  SMeterMeta *pMeterMeta;
+  STableMeta *pMeterMeta;

  union {
    char *filename;
@@ -199,9 +201,9 @@ typedef struct SQueryInfo {
  char     intervalTimeUnit;

  int64_t         etime, stime;
-  int64_t         nAggTimeInterval;  // aggregation time interval
-  int64_t         nSlidingTime;      // sliding window in mseconds
-  SSqlGroupbyExpr groupbyExpr;       // group by tags info
+  int64_t         intervalTime;  // aggregation time interval
+  int64_t         slidingTime;   // sliding window in mseconds
+  SSqlGroupbyExpr groupbyExpr;   // group by tags info

  SColumnBaseInfo  colList;
  SFieldInfo       fieldsInfo;
@@ -217,9 +219,9 @@ typedef struct SQueryInfo {
  int64_t *        defaultVal;   // default value for interpolation
  char *           msg;          // pointer to the pCmd->payload to keep error message temporarily
  int64_t          clauseLimit;  // limit for current sub clause
-  
+
  // offset value in the original sql expression, NOT sent to virtual node, only applied at client side
-  int64_t          prjOffset;
+  int64_t prjOffset;
 } SQueryInfo;

 // data source from sql string or from file
@@ -270,29 +272,27 @@ typedef struct SResRec {
 struct STSBuf;

 typedef struct {
-  uint8_t               code;
-  int64_t               numOfRows;   // num of results in current retrieved
-  int64_t               numOfTotal;  // num of total results
-  int64_t               numOfTotalInCurrentClause;  // num of total result in current subclause
-  
-  char *                pRsp;
-  int                   rspType;
-  int                   rspLen;
-  uint64_t              qhandle;
-  int64_t               uid;
-  int64_t               useconds;
-  int64_t               offset;  // offset value from vnode during projection query of stable
-  int                   row;
-  int16_t               numOfnchar;
-  int16_t               precision;
-  int32_t               numOfGroups;
-  SResRec *             pGroupRec;
-  char *                data;
-  short *               bytes;
-  void **               tsrow;
-  char **               buffer;  // Buffer used to put multibytes encoded using unicode (wchar_t)
+  int32_t       code;
+  int64_t       numOfRows;                  // num of results in current retrieved
+  int64_t       numOfTotal;                 // num of total results
+  int64_t       numOfTotalInCurrentClause;  // num of total result in current subclause
+  char *        pRsp;
+  int           rspType;
+  int           rspLen;
+  uint64_t      qhandle;
+  int64_t       uid;
+  int64_t       useconds;
+  int64_t       offset;  // offset value from vnode during projection query of stable
+  int           row;
+  int16_t       numOfCols;
+  int16_t       precision;
+  int32_t       numOfGroups;
+  SResRec *     pGroupRec;
+  char *        data;
+  void **       tsrow;
+  char **       buffer;  // Buffer used to put multibytes encoded using unicode (wchar_t)
+  SColumnIndex *pColumnIndex;
  struct SLocalReducer *pLocalReducer;
-  SColumnIndex *        pColumnIndex;
 } SSqlRes;

 typedef struct _tsc_obj {
@@ -324,14 +324,12 @@ typedef struct _sql_obj {
  short             vnode;
  int64_t           stime;
  uint32_t          queryId;
-  void *            thandle;
-  SRpcIpSet         ipSet;
  void *            pStream;
  void *            pSubscription;
  char *            sqlstr;
  char              retry;
  char              maxRetry;
-  uint8_t           index;
+  SRpcIpSet        *ipList;
  char              freed : 4;
  char              listed : 4;
  tsem_t            rspSem;
@@ -373,18 +371,20 @@ typedef struct _sstream {
  struct _sstream *prev, *next;
 } SSqlStream;

+int32_t tscInitRpc(const char *user, const char *secret);
+
 // tscSql API
 int tsParseSql(SSqlObj *pSql, bool multiVnodeInsertion);

 void tscInitMsgs();
 extern int (*tscBuildMsg[TSDB_SQL_MAX])(SSqlObj *pSql, SSqlInfo *pInfo);

-void *tscProcessMsgFromServer(char *msg, void *ahandle, void *thandle);
-int   tscProcessSql(SSqlObj *pSql);
+void tscProcessMsgFromServer(char type, void *pCont, int contLen, void *ahandle, int32_t code);
+int  tscProcessSql(SSqlObj *pSql);

 void tscAsyncInsertMultiVnodesProxy(void *param, TAOS_RES *tres, int numOfRows);

-int  tscRenewMeterMeta(SSqlObj *pSql, char *meterId);
+int  tscRenewMeterMeta(SSqlObj *pSql, char *tableId);
 void tscQueueAsyncRes(SSqlObj *pSql);

 void tscQueueAsyncError(void(*fp), void *param);
@@ -400,19 +400,17 @@ int taos_retrieve(TAOS_RES *res);
 int32_t tscTansformSQLFunctionForSTableQuery(SQueryInfo *pQueryInfo);
 void    tscRestoreSQLFunctionForMetricQuery(SQueryInfo *pQueryInfo);

-void tscClearSqlMetaInfoForce(SSqlCmd *pCmd);
-
 int32_t tscCreateResPointerInfo(SSqlRes *pRes, SQueryInfo *pQueryInfo);
 void    tscDestroyResPointerInfo(SSqlRes *pRes);

 void tscFreeSqlCmdData(SSqlCmd *pCmd);
-void tscFreeResData(SSqlObj* pSql);
+void tscFreeResData(SSqlObj *pSql);

 /**
 * free query result of the sql object
 * @param pObj
 */
-void tscFreeSqlResult(SSqlObj* pSql);
+void tscFreeSqlResult(SSqlObj *pSql);

 /**
 * only free part of resources allocated during query.

--- a/src/client/src/tscAst.c
+++ b/src/client/src/tscAst.c
@@ -21,7 +21,7 @@
 #include "tscSyntaxtreefunction.h"
 #include "tschemautil.h"
 #include "taosdef.h"
-#include "tskiplist.h"
+#include "sskiplist.h"
 #include "tsqldef.h"
 #include "tsqlfunction.h"
 #include "tstoken.h"
@@ -139,7 +139,7 @@ static tSQLSyntaxNode *tSQLSyntaxNodeCreate(SSchema *pSchema, int32_t numOfCols,
    } else {
      pNode->colId = -1;
      pNode->pSchema->type = TSDB_DATA_TYPE_BINARY;
-      pNode->pSchema->bytes = TSDB_METER_NAME_LEN;
+      pNode->pSchema->bytes = TSDB_TABLE_NAME_LEN;
      strcpy(pNode->pSchema->name, TSQL_TBNAME_L);
      pNode->pSchema->colId = -1;
    }
@@ -158,7 +158,7 @@ static tSQLSyntaxNode *tSQLSyntaxNodeCreate(SSchema *pSchema, int32_t numOfCols,
  return pNode;
 }

-static uint8_t getBinaryExprOptr(SSQLToken *pToken) {
+uint8_t getBinaryExprOptr(SSQLToken *pToken) {
  switch (pToken->type) {
    case TK_LT:
      return TSDB_RELATION_LESS;
@@ -183,6 +183,7 @@ static uint8_t getBinaryExprOptr(SSQLToken *pToken) {
    case TK_STAR:
      return TSDB_BINARY_OP_MULTIPLY;
    case TK_SLASH:
+    case TK_DIVIDE:
      return TSDB_BINARY_OP_DIVIDE;
    case TK_REM:
      return TSDB_BINARY_OP_REMAINDER;

--- a/src/client/src/tscAsync.c
+++ b/src/client/src/tscAsync.c
@@ -284,8 +284,15 @@ void tscAsyncFetchSingleRowProxy(void *param, TAOS_RES *tres, int numOfRows) {
    return;
  }
  
-  for (int i = 0; i < pCmd->numOfCols; ++i)
-    pRes->tsrow[i] = TSC_GET_RESPTR_BASE(pRes, pQueryInfo, i, pQueryInfo->order) + pRes->bytes[i] * pRes->row;
+  for (int i = 0; i < pCmd->numOfCols; ++i){
+    SSqlExpr* pExpr = pQueryInfo->fieldsInfo.pSqlExpr[i];
+    if (pExpr != NULL) {
+      pRes->tsrow[i] = TSC_GET_RESPTR_BASE(pRes, pQueryInfo, i) + pExpr->resBytes * pRes->row;
+    } else {
+      //todo add
+    }
+  }
+  
  pRes->row++;

  (*pSql->fetchFp)(pSql->param, pSql, pSql->res.tsrow);
@@ -299,7 +306,12 @@ void tscProcessFetchRow(SSchedMsg *pMsg) {
  SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);

  for (int i = 0; i < pCmd->numOfCols; ++i) {
-    pRes->tsrow[i] = TSC_GET_RESPTR_BASE(pRes, pQueryInfo, i, pQueryInfo->order) + pRes->bytes[i] * pRes->row;
+    SSqlExpr* pExpr = pQueryInfo->fieldsInfo.pSqlExpr[i];
+    if (pExpr != NULL) {
+      pRes->tsrow[i] = TSC_GET_RESPTR_BASE(pRes, pQueryInfo, i) + pExpr->resBytes * pRes->row;
+    } else {
+      //todo add
+    }
  }
  
  pRes->row++;
@@ -318,13 +330,6 @@ void tscProcessAsyncRes(SSchedMsg *pMsg) {
  int cmd = pCmd->command;
  int code = pRes->code ? -pRes->code : pRes->numOfRows;

-  if ((tscKeepConn[cmd] == 0 || (code != TSDB_CODE_SUCCESS && code != TSDB_CODE_ACTION_IN_PROGRESS)) &&
-      pSql->pStream == NULL) {
-    if (pSql->thandle) taosAddConnIntoCache(tscConnCache, pSql->thandle, pSql->ip, pSql->vnode, pTscObj->user);
-
-    pSql->thandle = NULL;
-  }
-
  // in case of async insert, restore the user specified callback function
  bool shouldFree = tscShouldFreeAsyncSqlObj(pSql);

@@ -451,11 +456,11 @@ void tscMeterMetaCallBack(void *param, TAOS_RES *res, int code) {
    if (code != 0) {
      code = abs(code);
      pRes->code = code;
-      tscTrace("%p failed to renew meterMeta", pSql);
+      tscTrace("%p failed to renew tableMeta", pSql);
      tsem_post(&pSql->rspSem);
    } else {
-      tscTrace("%p renew meterMeta successfully, command:%d, code:%d, thandle:%p, retry:%d",
-          pSql, pSql->cmd.command, pSql->res.code, pSql->thandle, pSql->retry);
+      tscTrace("%p renew tableMeta successfully, command:%d, code:%d, retry:%d",
+          pSql, pSql->cmd.command, pSql->res.code, pSql->retry);
  
      SMeterMetaInfo* pMeterMetaInfo = tscGetMeterMetaInfo(&pSql->cmd, 0, 0);
      assert(pMeterMetaInfo->pMeterMeta == NULL);
@@ -553,7 +558,7 @@ void tscMeterMetaCallBack(void *param, TAOS_RES *res, int code) {
    tscTansformSQLFunctionForSTableQuery(pQueryInfo);
    tscIncStreamExecutionCount(pSql->pStream);
  } else {
-    tscTrace("%p get meterMeta/metricMeta successfully", pSql);
+    tscTrace("%p get tableMeta/metricMeta successfully", pSql);
  }

  tscDoQuery(pSql);

--- a/src/client/src/tscFunctionImpl.c
+++ b/src/client/src/tscFunctionImpl.c
@@ -322,6 +322,10 @@ int32_t getResultDataInfo(int32_t dataType, int32_t dataBytes, int32_t functionI
  return TSDB_CODE_SUCCESS;
 }

+bool stableQueryFunctChanged(int32_t funcId) {
+  return (aAggs[funcId].stableFuncId != funcId);
+}
+
 /**
 * the numOfRes should be kept, since it may be used later
 * and allow the ResultInfo to be re initialized
@@ -719,12 +723,15 @@ static int32_t first_dist_data_req_info(SQLFunctionCtx *pCtx, TSKEY start, TSKEY
    return BLK_DATA_NO_NEEDED;
  }

-  SFirstLastInfo *pInfo = (SFirstLastInfo*) (pCtx->aOutputBuf + pCtx->inputBytes);
-  if (pInfo->hasResult != DATA_SET_FLAG) {
-    return BLK_DATA_ALL_NEEDED;
-  } else {  // data in current block is not earlier than current result
-    return (pInfo->ts <= start) ? BLK_DATA_NO_NEEDED : BLK_DATA_ALL_NEEDED;
-  }
+  // result buffer has not been set yet.
+  return BLK_DATA_ALL_NEEDED;
+  //todo optimize the filter info
+//  SFirstLastInfo *pInfo = (SFirstLastInfo*) (pCtx->aOutputBuf + pCtx->inputBytes);
+//  if (pInfo->hasResult != DATA_SET_FLAG) {
+//    return BLK_DATA_ALL_NEEDED;
+//  } else {  // data in current block is not earlier than current result
+//    return (pInfo->ts <= start) ? BLK_DATA_NO_NEEDED : BLK_DATA_ALL_NEEDED;
+//  }
 }

 static int32_t last_dist_data_req_info(SQLFunctionCtx *pCtx, TSKEY start, TSKEY end, int32_t colId,
@@ -733,12 +740,13 @@ static int32_t last_dist_data_req_info(SQLFunctionCtx *pCtx, TSKEY start, TSKEY
    return BLK_DATA_NO_NEEDED;
  }

-  SFirstLastInfo *pInfo = (SFirstLastInfo*) (pCtx->aOutputBuf + pCtx->inputBytes);
-  if (pInfo->hasResult != DATA_SET_FLAG) {
-    return BLK_DATA_ALL_NEEDED;
-  } else {
-    return (pInfo->ts > end) ? BLK_DATA_NO_NEEDED : BLK_DATA_ALL_NEEDED;
-  }
+  return BLK_DATA_ALL_NEEDED;
+//  SFirstLastInfo *pInfo = (SFirstLastInfo*) (pCtx->aOutputBuf + pCtx->inputBytes);
+//  if (pInfo->hasResult != DATA_SET_FLAG) {
+//    return BLK_DATA_ALL_NEEDED;
+//  } else {
+//    return (pInfo->ts > end) ? BLK_DATA_NO_NEEDED : BLK_DATA_ALL_NEEDED;
+//  }
 }

 //////////////////////////////////////////////////////////////////////////////////////////////
@@ -1437,7 +1445,9 @@ static void stddev_next_step(SQLFunctionCtx *pCtx) {
     */
    pStd->stage++;
    avg_finalizer(pCtx);
-
+  
+    pResInfo->initialized = true; // set it initialized to avoid re-initialization
+    
    // save average value into tmpBuf, for second stage scan
    SAvgInfo *pAvg = pResInfo->interResultBuf;

@@ -2184,7 +2194,7 @@ static STopBotInfo *getTopBotOutputInfo(SQLFunctionCtx *pCtx) {
  // only the first_stage_merge is directly written data into final output buffer
  if (pResInfo->superTableQ && pCtx->currentStage != SECONDARY_STAGE_MERGE) {
    return (STopBotInfo*) pCtx->aOutputBuf;
-  } else {  // for normal table query and super table at the secondary_stage, result is written to intermediate buffer
+  } else {  // during normal table query and super table at the secondary_stage, result is written to intermediate buffer
    return pResInfo->interResultBuf;
  }
 }
@@ -3312,7 +3322,7 @@ static void arithmetic_function(SQLFunctionCtx *pCtx) {
  tSQLBinaryExprCalcTraverse(sas->pExpr->pBinExprInfo.pBinExpr, pCtx->size, pCtx->aOutputBuf, sas, pCtx->order,
                             arithmetic_callback_function);

-  pCtx->aOutputBuf += pCtx->outputBytes * pCtx->size/* * GET_FORWARD_DIRECTION_FACTOR(pCtx->order)*/;
+  pCtx->aOutputBuf += pCtx->outputBytes * pCtx->size;
  pCtx->param[1].pz = NULL;
 }

@@ -3573,6 +3583,7 @@ void spread_function_finalizer(SQLFunctionCtx *pCtx) {
  }
  
  GET_RES_INFO(pCtx)->numOfRes = 1;  // todo add test case
+  doFinalizer(pCtx);
 }

 /*

--- a/src/client/src/tscJoinProcess.c
+++ b/src/client/src/tscJoinProcess.c
@@ -100,7 +100,7 @@ static int64_t doTSBlockIntersect(SSqlObj* pSql, SJoinSubquerySupporter* pSuppor
       * in case of stable query, limit/offset is not applied here. the limit/offset is applied to the
       * final results which is acquired after the secondry merge of in the client.
       */
-      if (pLimit->offset == 0 || pQueryInfo->nAggTimeInterval > 0 || QUERY_IS_STABLE_QUERY(pQueryInfo->type)) {
+      if (pLimit->offset == 0 || pQueryInfo->intervalTime > 0 || QUERY_IS_STABLE_QUERY(pQueryInfo->type)) {
        if (*st > elem1.ts) {
          *st = elem1.ts;
        }
@@ -165,7 +165,7 @@ SJoinSubquerySupporter* tscCreateJoinSupporter(SSqlObj* pSql, SSubqueryState* pS
  pSupporter->subqueryIndex = index;
  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, pSql->cmd.clauseIndex);
  
-  pSupporter->interval = pQueryInfo->nAggTimeInterval;
+  pSupporter->interval = pQueryInfo->intervalTime;
  pSupporter->limit = pQueryInfo->limit;

  SMeterMetaInfo* pMeterMetaInfo = tscGetMeterMetaInfo(&pSql->cmd, pSql->cmd.clauseIndex, index);
@@ -275,6 +275,7 @@ int32_t tscLaunchSecondPhaseSubqueries(SSqlObj* pSql) {
    pSubQueryInfo->tsBuf = NULL;
  
    // free result for async object will also free sqlObj
+    assert(pSubQueryInfo->exprsInfo.numOfExprs == 1); // ts_comp query only requires one resutl columns
    taos_free_result(pPrevSub);
  
    SSqlObj *pNew = createSubqueryObj(pSql, (int16_t) i, tscJoinQueryCallback, pSupporter, NULL);
@@ -293,24 +294,26 @@ int32_t tscLaunchSecondPhaseSubqueries(SSqlObj* pSql) {
    // set the second stage sub query for join process
    pQueryInfo->type |= TSDB_QUERY_TYPE_JOIN_SEC_STAGE;
  
-    pQueryInfo->nAggTimeInterval = pSupporter->interval;
+    pQueryInfo->intervalTime = pSupporter->interval;
    pQueryInfo->groupbyExpr = pSupporter->groupbyExpr;
  
    tscColumnBaseInfoCopy(&pQueryInfo->colList, &pSupporter->colList, 0);
    tscTagCondCopy(&pQueryInfo->tagCond, &pSupporter->tagCond);
  
-    tscSqlExprCopy(&pQueryInfo->exprsInfo, &pSupporter->exprsInfo, pSupporter->uid);
+    tscSqlExprCopy(&pQueryInfo->exprsInfo, &pSupporter->exprsInfo, pSupporter->uid, false);
    tscFieldInfoCopyAll(&pQueryInfo->fieldsInfo, &pSupporter->fieldsInfo);
-  
+    
+    pSupporter->exprsInfo.numOfExprs = 0;
+    pSupporter->fieldsInfo.numOfOutputCols = 0;
+    
    /*
     * if the first column of the secondary query is not ts function, add this function.
     * Because this column is required to filter with timestamp after intersecting.
     */
-    if (pSupporter->exprsInfo.pExprs[0].functionId != TSDB_FUNC_TS) {
+    if (pSupporter->exprsInfo.pExprs[0]->functionId != TSDB_FUNC_TS) {
      tscAddTimestampColumn(pQueryInfo, TSDB_FUNC_TS, 0);
    }
  
-    // todo refactor function name
    SQueryInfo *pNewQueryInfo = tscGetQueryInfoDetail(&pNew->cmd, 0);
    assert(pNew->numOfSubs == 0 && pNew->cmd.numOfClause == 1 && pNewQueryInfo->numOfTables == 1);
  

--- a/src/client/src/tscLocal.c
+++ b/src/client/src/tscLocal.c
@@ -77,7 +77,7 @@ static int32_t getToStringLength(const char *pData, int32_t length, int32_t type
 * length((uint64_t) 123456789011) > 12, greater than sizsof(uint64_t)
 */
 static int32_t tscMaxLengthOfTagsFields(SSqlObj *pSql) {
-  SMeterMeta *pMeta = tscGetMeterMetaInfo(&pSql->cmd, 0, 0)->pMeterMeta;
+  STableMeta *pMeta = tscGetMeterMetaInfo(&pSql->cmd, 0, 0)->pMeterMeta;

  if (pMeta->tableType == TSDB_TABLE_TYPE_SUPER_TABLE || pMeta->tableType == TSDB_TABLE_TYPE_NORMAL_TABLE ||
      pMeta->tableType == TSDB_TABLE_TYPE_STREAM_TABLE) {
@@ -109,7 +109,7 @@ static int32_t tscSetValueToResObj(SSqlObj *pSql, int32_t rowLen) {
  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
  
  SMeterMetaInfo *pMeterMetaInfo = tscGetMeterMetaInfoFromQueryInfo(pQueryInfo, 0);
-  SMeterMeta *    pMeta = pMeterMetaInfo->pMeterMeta;
+  STableMeta *    pMeta = pMeterMetaInfo->pMeterMeta;

  /*
   * tagValueCnt is to denote the number of tags columns for meter, not metric. and is to show the column data.
@@ -251,6 +251,13 @@ static int32_t tscBuildMeterSchemaResultFields(SSqlObj *pSql, int32_t numOfCols,

  tscFieldInfoSetValue(&pQueryInfo->fieldsInfo, 3, TSDB_DATA_TYPE_BINARY, "Note", noteColLength);
  rowLen += noteColLength;
+  
+  //set the sqlexpr part
+  SColumnIndex index = {0};
+  pQueryInfo->fieldsInfo.pSqlExpr[0] = tscSqlExprInsert(pQueryInfo, 0, TSDB_FUNC_TS_DUMMY, &index, TSDB_DATA_TYPE_BINARY, TSDB_COL_NAME_LEN, TSDB_COL_NAME_LEN);
+  pQueryInfo->fieldsInfo.pSqlExpr[1] = tscSqlExprInsert(pQueryInfo, 1, TSDB_FUNC_TS_DUMMY, &index, TSDB_DATA_TYPE_BINARY, typeColLength, typeColLength);
+  pQueryInfo->fieldsInfo.pSqlExpr[2] = tscSqlExprInsert(pQueryInfo, 2, TSDB_FUNC_TS_DUMMY, &index, TSDB_DATA_TYPE_INT, sizeof(int32_t), sizeof(int32_t));
+  pQueryInfo->fieldsInfo.pSqlExpr[3] = tscSqlExprInsert(pQueryInfo, 3, TSDB_FUNC_TS_DUMMY, &index, TSDB_DATA_TYPE_BINARY, noteColLength, noteColLength);

  return rowLen;
 }
@@ -285,7 +292,7 @@ static int tscBuildMetricTagProjectionResult(SSqlObj *pSql) {
  
  SMeterMetaInfo *pMeterMetaInfo = tscGetMeterMetaInfoFromQueryInfo(pQueryInfo, 0);

-  SMetricMeta *pMetricMeta = pMeterMetaInfo->pMetricMeta;
+  SSuperTableMeta *pMetricMeta = pMeterMetaInfo->pMetricMeta;
  SSchema *    pSchema = tsGetTagSchema(pMeterMetaInfo->pMeterMeta);

  int32_t vOffset[TSDB_MAX_COLUMNS] = {0};
@@ -293,13 +300,13 @@ static int tscBuildMetricTagProjectionResult(SSqlObj *pSql) {
  for (int32_t f = 1; f < pMeterMetaInfo->numOfTags; ++f) {
    int16_t tagColumnIndex = pMeterMetaInfo->tagColumnIndex[f - 1];
    if (tagColumnIndex == -1) {
-      vOffset[f] = vOffset[f - 1] + TSDB_METER_NAME_LEN;
+      vOffset[f] = vOffset[f - 1] + TSDB_TABLE_NAME_LEN;
    } else {
      vOffset[f] = vOffset[f - 1] + pSchema[tagColumnIndex].bytes;
    }
  }

-  int32_t totalNumOfResults = pMetricMeta->numOfMeters;
+  int32_t totalNumOfResults = pMetricMeta->numOfTables;
  int32_t rowLen = tscGetResRowLength(pQueryInfo);

  tscInitResObjForLocalQuery(pSql, totalNumOfResults, rowLen);
@@ -309,7 +316,7 @@ static int tscBuildMetricTagProjectionResult(SSqlObj *pSql) {
    SVnodeSidList *pSidList = (SVnodeSidList *)((char *)pMetricMeta + pMetricMeta->list[i]);

    for (int32_t j = 0; j < pSidList->numOfSids; ++j) {
-      SMeterSidExtInfo *pSidExt = tscGetMeterSidInfo(pSidList, j);
+      STableSidExtInfo *pSidExt = tscGetMeterSidInfo(pSidList, j);
      
      for (int32_t k = 0; k < pQueryInfo->fieldsInfo.numOfOutputCols; ++k) {
        SColIndexEx *pColIndex = &tscSqlExprGet(pQueryInfo, k)->colInfo;
@@ -336,7 +343,7 @@ static int tscBuildMetricTagSqlFunctionResult(SSqlObj *pSql) {

  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(pCmd, 0);
  
-  SMetricMeta *pMetricMeta = tscGetMeterMetaInfoFromQueryInfo(pQueryInfo, 0)->pMetricMeta;
+  SSuperTableMeta *pMetricMeta = tscGetMeterMetaInfoFromQueryInfo(pQueryInfo, 0)->pMetricMeta;
  int32_t      totalNumOfResults = 1;  // count function only produce one result
  int32_t      rowLen = tscGetResRowLength(pQueryInfo);

@@ -351,7 +358,7 @@ static int tscBuildMetricTagSqlFunctionResult(SSqlObj *pSql) {
        TAOS_FIELD *pField = tscFieldInfoGetField(pQueryInfo, k);

        memcpy(pRes->data + tscFieldInfoGetOffset(pQueryInfo, i) * totalNumOfResults + pField->bytes * rowIdx,
-               &pMetricMeta->numOfMeters, sizeof(pMetricMeta->numOfMeters));
+               &pMetricMeta->numOfTables, sizeof(pMetricMeta->numOfTables));
      } else {
        tscError("not support operations");
        continue;
@@ -368,7 +375,7 @@ static int tscProcessQueryTags(SSqlObj *pSql) {
  
  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(pCmd, 0);
  
-  SMeterMeta *pMeterMeta = tscGetMeterMetaInfoFromQueryInfo(pQueryInfo, 0)->pMeterMeta;
+  STableMeta *pMeterMeta = tscGetMeterMetaInfoFromQueryInfo(pQueryInfo, 0)->pMeterMeta;
  if (pMeterMeta == NULL || pMeterMeta->numOfTags == 0 || pMeterMeta->numOfColumns == 0) {
    strcpy(pCmd->payload, "invalid table");
    pSql->res.code = TSDB_CODE_INVALID_TABLE;
@@ -455,6 +462,8 @@ void tscSetLocalQueryResult(SSqlObj *pSql, const char *val, const char *columnNa
  tscInitResObjForLocalQuery(pSql, 1, valueLength);

  TAOS_FIELD *pField = tscFieldInfoGetField(pQueryInfo, 0);
+  pQueryInfo->fieldsInfo.pSqlExpr[0] = pQueryInfo->exprsInfo.pExprs[0];
+  
  strncpy(pRes->data, val, pField->bytes);
 }


--- a/src/client/src/tscParseInsert.c
+++ b/src/client/src/tscParseInsert.c
@@ -496,7 +496,7 @@ static int32_t rowDataCompar(const void *lhs, const void *rhs) {
  }
 }

-int tsParseValues(char **str, STableDataBlocks *pDataBlock, SMeterMeta *pMeterMeta, int maxRows,
+int tsParseValues(char **str, STableDataBlocks *pDataBlock, STableMeta *pMeterMeta, int maxRows,
                  SParsedDataColInfo *spd, char *error, int32_t *code, char *tmpTokenBuf) {
  int32_t   index = 0;
  SSQLToken sToken;
@@ -601,7 +601,7 @@ int32_t tscAllocateMemIfNeed(STableDataBlocks *pDataBlock, int32_t rowSize, int3
  return TSDB_CODE_SUCCESS;
 }

-static void tsSetBlockInfo(SShellSubmitBlock *pBlocks, const SMeterMeta *pMeterMeta, int32_t numOfRows) {
+static void tsSetBlockInfo(SShellSubmitBlock *pBlocks, const STableMeta *pMeterMeta, int32_t numOfRows) {
  pBlocks->sid = pMeterMeta->sid;
  pBlocks->uid = pMeterMeta->uid;
  pBlocks->sversion = pMeterMeta->sversion;
@@ -655,7 +655,7 @@ static int32_t doParseInsertStatement(SSqlObj *pSql, void *pTableHashList, char
                                      int32_t *totalNum) {
  SSqlCmd *       pCmd = &pSql->cmd;
  SMeterMetaInfo *pMeterMetaInfo = tscGetMeterMetaInfo(pCmd, pCmd->clauseIndex, 0);
-  SMeterMeta *    pMeterMeta = pMeterMetaInfo->pMeterMeta;
+  STableMeta *    pMeterMeta = pMeterMetaInfo->pMeterMeta;

  STableDataBlocks *dataBuf = NULL;
  int32_t ret = tscGetDataBlockFromList(pTableHashList, pCmd->pDataBlocks, pMeterMeta->uid, TSDB_DEFAULT_PAYLOAD_SIZE,
@@ -695,7 +695,7 @@ static int32_t doParseInsertStatement(SSqlObj *pSql, void *pTableHashList, char
  tsSetBlockInfo(pBlocks, pMeterMeta, numOfRows);

  dataBuf->vgid = pMeterMeta->vgid;
-  dataBuf->numOfMeters = 1;
+  dataBuf->numOfTables = 1;

  /*
   * the value of pRes->numOfRows does not affect the true result of AFFECTED ROWS,
@@ -1136,7 +1136,7 @@ int doParseInsertSql(SSqlObj *pSql, char *str) {
      wordfree(&full_path);

      STableDataBlocks *pDataBlock = NULL;
-      SMeterMeta* pMeterMeta = pMeterMetaInfo->pMeterMeta;
+      STableMeta* pMeterMeta = pMeterMetaInfo->pMeterMeta;
      
      int32_t ret = tscCreateDataBlock(PATH_MAX, pMeterMeta->rowSize, sizeof(SShellSubmitBlock), pMeterMetaInfo->name,
                                       pMeterMeta, &pDataBlock);
@@ -1148,7 +1148,7 @@ int doParseInsertSql(SSqlObj *pSql, char *str) {
      strcpy(pDataBlock->filename, fname);
    } else if (sToken.type == TK_LP) {
      /* insert into tablename(col1, col2,..., coln) values(v1, v2,... vn); */
-      SMeterMeta *pMeterMeta = tscGetMeterMetaInfo(pCmd, pCmd->clauseIndex, 0)->pMeterMeta;
+      STableMeta *pMeterMeta = tscGetMeterMetaInfo(pCmd, pCmd->clauseIndex, 0)->pMeterMeta;
      SSchema *   pSchema = tsGetSchema(pMeterMeta);

      if (validateDataSource(pCmd, DATA_FROM_SQL_STRING, sToken.z) != TSDB_CODE_SUCCESS) {
@@ -1349,7 +1349,7 @@ static int doPackSendDataBlock(SSqlObj *pSql, int32_t numOfRows, STableDataBlock
  SSqlCmd *pCmd = &pSql->cmd;

  assert(pCmd->numOfClause == 1);
-  SMeterMeta *pMeterMeta = tscGetMeterMetaInfo(pCmd, pCmd->clauseIndex, 0)->pMeterMeta;
+  STableMeta *pMeterMeta = tscGetMeterMetaInfo(pCmd, pCmd->clauseIndex, 0)->pMeterMeta;

  SShellSubmitBlock *pBlocks = (SShellSubmitBlock *)(pTableDataBlocks->pData);
  tsSetBlockInfo(pBlocks, pMeterMeta, numOfRows);
@@ -1383,7 +1383,7 @@ static int tscInsertDataFromFile(SSqlObj *pSql, FILE *fp, char *tmpTokenBuf) {
  int             nrows = 0;
  
  SMeterMetaInfo *pMeterMetaInfo = tscGetMeterMetaInfo(pCmd, pCmd->clauseIndex, 0);
-  SMeterMeta *    pMeterMeta = pMeterMetaInfo->pMeterMeta;
+  STableMeta *    pMeterMeta = pMeterMetaInfo->pMeterMeta;
  assert(pCmd->numOfClause == 1);
  
  int32_t         rowSize = pMeterMeta->rowSize;
@@ -1544,7 +1544,7 @@ void tscProcessMultiVnodesInsertFromFile(SSqlObj *pSql) {
      continue;
    }

-    strncpy(pMeterMetaInfo->name, pDataBlock->meterId, TSDB_TABLE_ID_LEN);
+    strncpy(pMeterMetaInfo->name, pDataBlock->tableId, TSDB_TABLE_ID_LEN);
    memset(pDataBlock->pData, 0, pDataBlock->nAllocSize);

    int32_t ret = tscGetMeterMeta(pSql, pMeterMetaInfo);

--- a/src/client/src/tscPrepare.c
+++ b/src/client/src/tscPrepare.c
@@ -451,7 +451,6 @@ static int insertStmtExecute(STscStmt* stmt) {
  pRes->numOfTotalInCurrentClause = 0;
  
  pRes->qhandle = 0;
-  pSql->thandle = NULL;

  tscDoQuery(pSql);


--- a/src/client/src/tscProfile.c
+++ b/src/client/src/tscProfile.c
@@ -145,7 +145,7 @@ void tscKillQuery(STscObj *pObj, uint32_t killId) {

  if (pSql == NULL) return;

-  tscTrace("%p query is killed, queryId:%d thandle:%p", pSql, killId, pSql->thandle);
+  tscTrace("%p query is killed, queryId:%d", pSql, killId);
  taos_stop_query(pSql);
 }

@@ -209,16 +209,16 @@ void tscKillStream(STscObj *pObj, uint32_t killId) {
 }

 char *tscBuildQueryStreamDesc(char *pMsg, STscObj *pObj) {
-  SQList *pQList = (SQList *)pMsg;
+  SQqueryList *pQList = (SQqueryList *)pMsg;
  char *  pMax = pMsg + TSDB_PAYLOAD_SIZE - 256;

-  SQDesc *pQdesc = pQList->qdesc;
+  SQueryDesc *pQdesc = pQList->qdesc;
  pQList->numOfQueries = 0;

  // We extract the lock to tscBuildHeartBeatMsg function.
  /* pthread_mutex_lock (&pObj->mutex); */

-  pMsg += sizeof(SQList);
+  pMsg += sizeof(SQqueryList);
  SSqlObj *pSql = pObj->sqlList;
  while (pSql) {
    /*
@@ -239,15 +239,15 @@ char *tscBuildQueryStreamDesc(char *pMsg, STscObj *pObj) {
    pQList->numOfQueries++;
    pQdesc++;
    pSql = pSql->next;
-    pMsg += sizeof(SQDesc);
+    pMsg += sizeof(SQueryDesc);
    if (pMsg > pMax) break;
  }

-  SSList *pSList = (SSList *)pMsg;
-  SSDesc *pSdesc = pSList->sdesc;
+  SStreamList *pSList = (SStreamList *)pMsg;
+  SStreamDesc *pSdesc = pSList->sdesc;
  pSList->numOfStreams = 0;

-  pMsg += sizeof(SSList);
+  pMsg += sizeof(SStreamList);
  SSqlStream *pStream = pObj->streamList;
  while (pStream) {
    strncpy(pSdesc->sql, pStream->pSql->sqlstr, TSDB_SHOW_SQL_LEN - 1);
@@ -265,7 +265,7 @@ char *tscBuildQueryStreamDesc(char *pMsg, STscObj *pObj) {
    pSList->numOfStreams++;
    pSdesc++;
    pStream = pStream->next;
-    pMsg += sizeof(SSDesc);
+    pMsg += sizeof(SStreamDesc);
    if (pMsg > pMax) break;
  }


--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
--- a/src/client/src/tscSchemaUtil.c
+++ b/src/client/src/tscSchemaUtil.c
@@ -64,14 +64,14 @@ bool isValidSchema(struct SSchema* pSchema, int32_t numOfCols) {
  return (rowLen <= TSDB_MAX_BYTES_PER_ROW);
 }

-struct SSchema* tsGetSchema(SMeterMeta* pMeta) {
+struct SSchema* tsGetSchema(STableMeta* pMeta) {
  if (pMeta == NULL) {
    return NULL;
  }
  return tsGetColumnSchema(pMeta, 0);
 }

-struct SSchema* tsGetTagSchema(SMeterMeta* pMeta) {
+struct SSchema* tsGetTagSchema(STableMeta* pMeta) {
  if (pMeta == NULL || pMeta->numOfTags == 0) {
    return NULL;
  }
@@ -79,12 +79,12 @@ struct SSchema* tsGetTagSchema(SMeterMeta* pMeta) {
  return tsGetColumnSchema(pMeta, pMeta->numOfColumns);
 }

-struct SSchema* tsGetColumnSchema(SMeterMeta* pMeta, int32_t startCol) {
-  return (SSchema*)(((char*)pMeta + sizeof(SMeterMeta)) + startCol * sizeof(SSchema));
+struct SSchema* tsGetColumnSchema(STableMeta* pMeta, int32_t startCol) {
+  return (SSchema*)(((char*)pMeta + sizeof(STableMeta)) + startCol * sizeof(SSchema));
 }

 struct SSchema tsGetTbnameColumnSchema() {
-  struct SSchema s = {.colId = TSDB_TBNAME_COLUMN_INDEX, .type = TSDB_DATA_TYPE_BINARY, .bytes = TSDB_METER_NAME_LEN};
+  struct SSchema s = {.colId = TSDB_TBNAME_COLUMN_INDEX, .type = TSDB_DATA_TYPE_BINARY, .bytes = TSDB_TABLE_NAME_LEN};
  strcpy(s.name, TSQL_TBNAME_L);
  
  return s;
@@ -94,7 +94,7 @@ struct SSchema tsGetTbnameColumnSchema() {
 * the MeterMeta data format in memory is as follows:
 *
 * +--------------------+
- * |SMeterMeta Body data|  sizeof(SMeterMeta)
+ * |STableMeta Body data|  sizeof(STableMeta)
 * +--------------------+
 * |Schema data         |  numOfTotalColumns * sizeof(SSchema)
 * +--------------------+
@@ -104,14 +104,14 @@ struct SSchema tsGetTbnameColumnSchema() {
 * @param pMeta
 * @return
 */
-char* tsGetTagsValue(SMeterMeta* pMeta) {
+char* tsGetTagsValue(STableMeta* pMeta) {
  int32_t  numOfTotalCols = pMeta->numOfColumns + pMeta->numOfTags;
-  uint32_t offset = sizeof(SMeterMeta) + numOfTotalCols * sizeof(SSchema);
+  uint32_t offset = sizeof(STableMeta) + numOfTotalCols * sizeof(SSchema);

  return ((char*)pMeta + offset);
 }

-bool tsMeterMetaIdentical(SMeterMeta* p1, SMeterMeta* p2) {
+bool tsMeterMetaIdentical(STableMeta* p1, STableMeta* p2) {
  if (p1 == NULL || p2 == NULL || p1->uid != p2->uid || p1->sversion != p2->sversion) {
    return false;
  }
@@ -120,7 +120,7 @@ bool tsMeterMetaIdentical(SMeterMeta* p1, SMeterMeta* p2) {
    return true;
  }

-  size_t size = sizeof(SMeterMeta) + p1->numOfColumns * sizeof(SSchema);
+  size_t size = sizeof(STableMeta) + p1->numOfColumns * sizeof(SSchema);

  for (int32_t i = 0; i < p1->numOfTags; ++i) {
    SSchema* pColSchema = tsGetColumnSchema(p1, i + p1->numOfColumns);
@@ -151,16 +151,16 @@ static FORCE_INLINE size_t copy(char* dst, const char* src, char delimiter) {

 /**
 * extract table name from meterid, which the format of userid.dbname.metername
- * @param meterId
+ * @param tableId
 * @return
 */
-void extractTableName(char* meterId, char* name) {
-  char* r = skipSegments(meterId, TS_PATH_DELIMITER[0], 2);
+void extractTableName(char* tableId, char* name) {
+  char* r = skipSegments(tableId, TS_PATH_DELIMITER[0], 2);
  copy(name, r, TS_PATH_DELIMITER[0]);
 }

-SSQLToken extractDBName(char* meterId, char* name) {
-  char* r = skipSegments(meterId, TS_PATH_DELIMITER[0], 1);
+SSQLToken extractDBName(char* tableId, char* name) {
+  char* r = skipSegments(tableId, TS_PATH_DELIMITER[0], 1);
  size_t len = copy(name, r, TS_PATH_DELIMITER[0]);

  SSQLToken token = {.z = name, .n = len, .type = TK_STRING};

--- a/src/client/src/tscSecondaryMerge.c
+++ b/src/client/src/tscSecondaryMerge.c
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
--- a/src/client/src/tscSql.c
+++ b/src/client/src/tscSql.c
@@ -13,8 +13,9 @@
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

-#include "os.h"
+#include <tast.h>
 #include "hash.h"
+#include "os.h"
 #include "tcache.h"
 #include "tlog.h"
 #include "tnote.h"
@@ -34,12 +35,8 @@ TAOS *taos_connect_imp(const char *ip, const char *user, const char *pass, const
                       void (*fp)(void *, TAOS_RES *, int), void *param, void **taos) {
  STscObj *pObj;

-  taos_init();

-  if (pTscMgmtConn == NULL || pVnodeConn == NULL) {
-    globalCode = TSDB_CODE_APP_ERROR;
-    return NULL;
-  }
+  taos_init();

  if (user == NULL) {
    globalCode = TSDB_CODE_INVALID_ACCT;
@@ -63,15 +60,30 @@ TAOS *taos_connect_imp(const char *ip, const char *user, const char *pass, const
    }
  }

+  if (tscInitRpc(user, pass) != 0) {
+    globalCode = TSDB_CODE_NETWORK_UNAVAIL;
+    return NULL;
+  }
+
  if (ip && ip[0]) {
-    tscMgmtIpList.numOfIps = 3;
-    tscMgmtIpList.ip[0] = inet_addr(ip);
-    tscMgmtIpList.ip[1] = inet_addr(tsMasterIp);
-    tscMgmtIpList.ip[2] = inet_addr(tsSecondIp);
-    tscMgmtIpList.index = 0;
+    tscMgmtIpList.inUse = 0;
    tscMgmtIpList.port = tsMgmtShellPort;
+    tscMgmtIpList.numOfIps = 1;
+    tscMgmtIpList.ip[0] = inet_addr(ip);
+
+    if (tsMasterIp[0] && strcmp(ip, tsMasterIp) != 0) {
+      tscMgmtIpList.numOfIps = 2;
+      tscMgmtIpList.ip[1] = inet_addr(tsMasterIp);
+    }
+
+    if (tsSecondIp[0] && strcmp(tsSecondIp, tsMasterIp) != 0) {
+      tscMgmtIpList.numOfIps = 3;
+      tscMgmtIpList.ip[2] = inet_addr(tsSecondIp);
+    }
  }

+  tscMgmtIpList.port = port ? port : tsMgmtShellPort;
+
  pObj = (STscObj *)malloc(sizeof(STscObj));
  if (NULL == pObj) {
    globalCode = TSDB_CODE_CLI_OUT_OF_MEMORY;
@@ -197,7 +209,7 @@ int taos_query_imp(STscObj *pObj, SSqlObj *pSql) {
    taosCleanUpHashTable(pSql->pTableHashList);
    pSql->pTableHashList = NULL;
  }
-  
+
  tscDump("%p pObj:%p, SQL: %s", pSql, pObj, pSql->sqlstr);

  pRes->code = (uint8_t)tsParseSql(pSql, false);
@@ -208,7 +220,6 @@ int taos_query_imp(STscObj *pObj, SSqlObj *pSql) {
   * to free connection, which may cause segment fault, when the parse phrase is not even successfully executed.
   */
  pRes->qhandle = 0;
-  pSql->thandle = NULL;

  if (pRes->code == TSDB_CODE_SUCCESS) {
    tscDoQuery(pSql);
@@ -364,9 +375,7 @@ int taos_fetch_block_impl(TAOS_RES *res, TAOS_ROW *rows) {

  SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(pCmd, 0);
  for (int i = 0; i < pQueryInfo->fieldsInfo.numOfOutputCols; ++i) {
-//    pRes->tsrow[i] = TSC_GET_RESPTR_BASE(pRes, pQueryInfo, i, pQueryInfo->order) +
-//                     pRes->bytes[i] * (1 - pQueryInfo->order.order) * (pRes->numOfRows - 1);
-    pRes->tsrow[i] = TSC_GET_RESPTR_BASE(pRes, pQueryInfo, i, pQueryInfo->order);
+    pRes->tsrow[i] = TSC_GET_RESPTR_BASE(pRes, pQueryInfo, i);
  }

  *rows = pRes->tsrow;
@@ -374,54 +383,115 @@ int taos_fetch_block_impl(TAOS_RES *res, TAOS_ROW *rows) {
  return (pQueryInfo->order.order == TSQL_SO_DESC) ? pRes->numOfRows : -pRes->numOfRows;
 }

+static void transferNcharData(SSqlObj *pSql, int32_t columnIndex, TAOS_FIELD *pField) {
+  SSqlRes *pRes = &pSql->res;
+
+  if (isNull(pRes->tsrow[columnIndex], pField->type)) {
+    pRes->tsrow[columnIndex] = NULL;
+  } else if (pField->type == TSDB_DATA_TYPE_NCHAR) {
+    // convert unicode to native code in a temporary buffer extra one byte for terminated symbol
+    if (pRes->buffer[columnIndex] == NULL) {
+      pRes->buffer[columnIndex] = malloc(pField->bytes + TSDB_NCHAR_SIZE);
+    }
+
+    /* string terminated char for binary data*/
+    memset(pRes->buffer[columnIndex], 0, pField->bytes + TSDB_NCHAR_SIZE);
+
+    if (taosUcs4ToMbs(pRes->tsrow[columnIndex], pField->bytes, pRes->buffer[columnIndex])) {
+      pRes->tsrow[columnIndex] = pRes->buffer[columnIndex];
+    } else {
+      tscError("%p charset:%s to %s. val:%ls convert failed.", pSql, DEFAULT_UNICODE_ENCODEC, tsCharset, pRes->tsrow);
+      pRes->tsrow[columnIndex] = NULL;
+    }
+  }
+}
+
+static char *getArithemicInputSrc(void *param, char *name, int32_t colId) {
+  SArithmeticSupport *pSupport = (SArithmeticSupport *)param;
+  SSqlFunctionExpr *  pExpr = pSupport->pExpr;
+
+  int32_t index = -1;
+  for (int32_t i = 0; i < pExpr->pBinExprInfo.numOfCols; ++i) {
+    if (strcmp(name, pExpr->pBinExprInfo.pReqColumns[i].name) == 0) {
+      index = i;
+      break;
+    }
+  }
+
+  assert(index >= 0 && index < pExpr->pBinExprInfo.numOfCols);
+  return pSupport->data[index] + pSupport->offset * pSupport->elemSize[index];
+}
+
 static void **doSetResultRowData(SSqlObj *pSql) {
  SSqlCmd *pCmd = &pSql->cmd;
  SSqlRes *pRes = &pSql->res;
-  
+
  assert(pRes->row >= 0 && pRes->row <= pRes->numOfRows);
-  
+
  if (pRes->row >= pRes->numOfRows) {  // all the results has returned to invoker
    tfree(pRes->tsrow);
    return pRes->tsrow;
  }
-  
-  SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);

+  SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);
+  
+  //todo refactor move away
+  for(int32_t k = 0; k < pQueryInfo->exprsInfo.numOfExprs; ++k) {
+    SSqlExpr* pExpr = tscSqlExprGet(pQueryInfo, k);
+    
+    if (k > 0) {
+      SSqlExpr* pPrev = tscSqlExprGet(pQueryInfo, k - 1);
+      pExpr->offset = pPrev->offset + pPrev->resBytes;
+    }
+  }
+  
  int32_t num = 0;
-  for (int i = 0; i < pQueryInfo->fieldsInfo.numOfOutputCols; ++i) {
-    pRes->tsrow[i] = TSC_GET_RESPTR_BASE(pRes, pQueryInfo, i, pQueryInfo->order) + pRes->bytes[i] * pRes->row;
+  for (int i = 0; i < tscNumOfFields(pQueryInfo); ++i) {
+    if (pQueryInfo->fieldsInfo.pSqlExpr[i] != NULL) {
+      SSqlExpr* pExpr = pQueryInfo->fieldsInfo.pSqlExpr[i];
+      pRes->tsrow[i] = TSC_GET_RESPTR_BASE(pRes, pQueryInfo, i) + pExpr->resBytes * pRes->row;
+    } else {
+      assert(0);
+    }

    // primary key column cannot be null in interval query, no need to check
-    if (i == 0 && pQueryInfo->nAggTimeInterval > 0) {
+    if (i == 0 && pQueryInfo->intervalTime > 0) {
      continue;
    }

    TAOS_FIELD *pField = tscFieldInfoGetField(pQueryInfo, i);
-    if (isNull(pRes->tsrow[i], pField->type)) {
-      pRes->tsrow[i] = NULL;
-    } else if (pField->type == TSDB_DATA_TYPE_NCHAR) {
-      // convert unicode to native code in a temporary buffer extra one byte for terminated symbol
-      if (pRes->buffer[num] == NULL) {
-        pRes->buffer[num] = malloc(pField->bytes + TSDB_NCHAR_SIZE);
-      }
+    transferNcharData(pSql, i, pField);

-      /* string terminated char for binary data*/
-      memset(pRes->buffer[num], 0, pField->bytes + TSDB_NCHAR_SIZE);
-
-      if (taosUcs4ToMbs(pRes->tsrow[i], pField->bytes, pRes->buffer[num])) {
-        pRes->tsrow[i] = pRes->buffer[num];
-      } else {
-        tscError("%p charset:%s to %s. val:%ls convert failed.", pSql, DEFAULT_UNICODE_ENCODEC, tsCharset, pRes->tsrow);
-        pRes->tsrow[i] = NULL;
+    // calculate the result from serveral other columns
+    if (pQueryInfo->fieldsInfo.pExpr != NULL && pQueryInfo->fieldsInfo.pExpr[i] != NULL) {
+      SArithmeticSupport *sas = (SArithmeticSupport *)calloc(1, sizeof(SArithmeticSupport));
+      sas->offset = 0;
+      sas->pExpr = pQueryInfo->fieldsInfo.pExpr[i];
+      
+      sas->numOfCols = sas->pExpr->pBinExprInfo.numOfCols;
+      
+      if (pRes->buffer[i] == NULL) {
+        pRes->buffer[i] = malloc(tscFieldInfoGetField(pQueryInfo, i)->bytes);
+      }
+      
+      for(int32_t k = 0; k < sas->numOfCols; ++k) {
+        int32_t columnIndex = sas->pExpr->pBinExprInfo.pReqColumns[k].colIdxInBuf;
+        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->pBinExprInfo.pBinExpr, 1, pRes->buffer[i], sas, TSQL_SO_ASC, getArithemicInputSrc);
+      pRes->tsrow[i] = pRes->buffer[i];
      
-      num++;
+      free(sas); //todo optimization
    }
  }

  assert(num <= pQueryInfo->fieldsInfo.numOfOutputCols);
-  
-  pRes->row++; // index increase one-step
+
+  pRes->row++;  // index increase one-step
  return pRes->tsrow;
 }

@@ -463,7 +533,7 @@ static bool tscHashRemainDataInSubqueryResultSet(SSqlObj *pSql) {
      if (pSql->pSubs[i] == 0) {
        continue;
      }
-      
+
      SSqlRes *   pRes1 = &pSql->pSubs[i]->res;
      SQueryInfo *pQueryInfo1 = tscGetQueryInfoDetail(&pSql->pSubs[i]->cmd, 0);

@@ -499,11 +569,10 @@ static void **tscBuildResFromSubqueries(SSqlObj *pSql) {

    if (numOfTableHasRes >= 2) {  // do merge result

-        success = (doSetResultRowData(pSql->pSubs[0]) != NULL) &&
-            (doSetResultRowData(pSql->pSubs[1]) != NULL);
-        //        TSKEY key1 = *(TSKEY *)pRes1->tsrow[0];
-        //        TSKEY key2 = *(TSKEY *)pRes2->tsrow[0];
-        //        printf("first:%" PRId64 ", second:%" PRId64 "\n", key1, key2);
+      success = (doSetResultRowData(pSql->pSubs[0]) != NULL) && (doSetResultRowData(pSql->pSubs[1]) != NULL);
+      //        TSKEY key1 = *(TSKEY *)pRes1->tsrow[0];
+      //        TSKEY key2 = *(TSKEY *)pRes2->tsrow[0];
+      //        printf("first:%" PRId64 ", second:%" PRId64 "\n", key1, key2);
    } else {  // only one subquery
      SSqlObj *pSub = pSql->pSubs[0];
      if (pSub == NULL) {
@@ -593,7 +662,7 @@ TAOS_ROW taos_fetch_row_impl(TAOS_RES *res) {

    tscProcessSql(pSql);  // retrieve data from virtual node

-    //if failed to retrieve data from current virtual node, try next one if exists
+    // if failed to retrieve data from current virtual node, try next one if exists
    if (hasMoreVnodesToTry(pSql)) {
      tscTryQueryNextVnode(pSql, NULL);
    }
@@ -635,7 +704,7 @@ TAOS_ROW taos_fetch_row(TAOS_RES *res) {
  // current subclause is completed, try the next subclause
  while (rows == NULL && pCmd->clauseIndex < pCmd->numOfClause - 1) {
    tscTryQueryNextClause(pSql, NULL);
-    
+
    // if the rows is not NULL, return immediately
    rows = taos_fetch_row_impl(res);
  }
@@ -698,7 +767,7 @@ int taos_select_db(TAOS *taos, const char *db) {
  return taos_query(taos, sql);
 }

-void taos_free_result_imp(TAOS_RES* res, int keepCmd) {
+void taos_free_result_imp(TAOS_RES *res, int keepCmd) {
  if (res == NULL) return;

  SSqlObj *pSql = (SSqlObj *)res;
@@ -713,7 +782,6 @@ void taos_free_result_imp(TAOS_RES* res, int keepCmd) {
    /* Query rsp is not received from vnode, so the qhandle is NULL */
    tscTrace("%p qhandle is null, abort free, fp:%p", pSql, pSql->fp);
    if (pSql->fp != NULL) {
-      pSql->thandle = NULL;
      tscFreeSqlObj(pSql);
      tscTrace("%p Async SqlObj is freed by app", pSql);
    } else if (keepCmd) {
@@ -752,7 +820,7 @@ void taos_free_result_imp(TAOS_RES* res, int keepCmd) {
    pCmd->command = (pCmd->command > TSDB_SQL_MGMT) ? TSDB_SQL_RETRIEVE : TSDB_SQL_FETCH;

    tscTrace("%p code:%d, numOfRows:%d, command:%d", pSql, pRes->code, pRes->numOfRows, pCmd->command);
-    
+
    void *fp = pSql->fp;
    if (fp != NULL) {
      pSql->freed = 1;
@@ -774,7 +842,6 @@ void taos_free_result_imp(TAOS_RES* res, int keepCmd) {
       *
       * Then this object will be reused and no free operation is required.
       */
-      pSql->thandle = NULL;
      if (keepCmd) {
        tscFreeSqlResult(pSql);
        tscTrace("%p sql result is freed by app while sql command is kept", pSql);
@@ -785,7 +852,6 @@ void taos_free_result_imp(TAOS_RES* res, int keepCmd) {
    }
  } else {
    // if no free resource msg is sent to vnode, we free this object immediately.
-    pSql->thandle = NULL;

    if (pSql->fp) {
      assert(pRes->numOfRows == 0 || (pCmd->command > TSDB_SQL_LOCAL));
@@ -801,9 +867,7 @@ void taos_free_result_imp(TAOS_RES* res, int keepCmd) {
  }
 }

-void taos_free_result(TAOS_RES *res) {
-  taos_free_result_imp(res, 0);
-}
+void taos_free_result(TAOS_RES *res) { taos_free_result_imp(res, 0); }

 int taos_errno(TAOS *taos) {
  STscObj *pObj = (STscObj *)taos;
@@ -819,26 +883,24 @@ int taos_errno(TAOS *taos) {
  return code;
 }

-static bool validErrorCode(int32_t code) {
-  return code >= TSDB_CODE_SUCCESS && code < TSDB_CODE_MAX_ERROR_CODE;
-}
+static bool validErrorCode(int32_t code) { return code >= TSDB_CODE_SUCCESS && code < TSDB_CODE_MAX_ERROR_CODE; }

 /*
 * In case of invalid sql error, additional information is attached to explain
 * why the sql is invalid
 */
-static bool hasAdditionalErrorInfo(int32_t code, SSqlCmd* pCmd) {
+static bool hasAdditionalErrorInfo(int32_t code, SSqlCmd *pCmd) {
  if (code != TSDB_CODE_INVALID_SQL) {
    return false;
  }

  size_t len = strlen(pCmd->payload);
-  
-  char* z = NULL;
+
+  char *z = NULL;
  if (len > 0) {
-    z = strstr (pCmd->payload, "invalid SQL");
+    z = strstr(pCmd->payload, "invalid SQL");
  }
-  
+
  return z != NULL;
 }

@@ -846,20 +908,21 @@ char *taos_errstr(TAOS *taos) {
  STscObj *pObj = (STscObj *)taos;
  uint8_t  code;

-  if (pObj == NULL || pObj->signature != pObj) return tstrerror(globalCode);
+  if (pObj == NULL || pObj->signature != pObj)
+    return (char*)tstrerror(globalCode);
+
+  SSqlObj *pSql = pObj->pSql;

-  SSqlObj* pSql = pObj->pSql;
-  
  if (validErrorCode(pSql->res.code)) {
    code = pSql->res.code;
  } else {
-    code = TSDB_CODE_OTHERS;  //unknown error
+    code = TSDB_CODE_OTHERS;  // unknown error
  }

  if (hasAdditionalErrorInfo(code, &pSql->cmd)) {
    return pSql->cmd.payload;
  } else {
-    return tstrerror(code);
+    return (char*)tstrerror(code);
  }
 }

@@ -899,11 +962,6 @@ void taos_stop_query(TAOS_RES *res) {
    return;
  }

-  if (pSql->thandle == NULL) {
-    tscTrace("%p no connection, abort cancel", res);
-    return;
-  }
-
  //taosStopRpcConn(pSql->thandle);
  tscTrace("%p query is cancelled", res);
 }
@@ -951,14 +1009,14 @@ int taos_print_row(char *str, TAOS_ROW row, TAOS_FIELD *fields, int num_fields)

      case TSDB_DATA_TYPE_BINARY:
      case TSDB_DATA_TYPE_NCHAR: {
-          size_t xlen = 0;
-          for (xlen = 0; xlen <= fields[i].bytes; xlen++) {
-            char c = ((char*)row[i])[xlen];
-            if (c == 0) break;
-            str[len++] = c;
-          }
-          str[len] = 0;
-        } break;
+        size_t xlen = 0;
+        for (xlen = 0; xlen <= fields[i].bytes; xlen++) {
+          char c = ((char *)row[i])[xlen];
+          if (c == 0) break;
+          str[len++] = c;
+        }
+        str[len] = 0;
+      } break;

      case TSDB_DATA_TYPE_TIMESTAMP:
        len += sprintf(str + len, "%" PRId64, *((int64_t *)row[i]));
@@ -1147,7 +1205,6 @@ int taos_load_table_info(TAOS *taos, const char *tableNameList) {
   * to free connection, which may cause segment fault, when the parse phrase is not even successfully executed.
   */
  pRes->qhandle = 0;
-  pSql->thandle = NULL;
  free(str);

  if (pRes->code != TSDB_CODE_SUCCESS) {

--- a/src/client/src/tscStream.c
+++ b/src/client/src/tscStream.c
@@ -246,8 +246,6 @@ static void tscProcessStreamRetrieveResult(void *param, TAOS_RES *res, int numOf
        int32_t retry = tsProjectExecInterval;
        tscError("%p stream:%p, retrieve no data, code:%d, retry in %" PRId64 "ms", pSql, pStream, numOfRows, retry);

-        tscClearSqlMetaInfoForce(&(pStream->pSql->cmd));
-        
        tscSetRetryTimer(pStream, pStream->pSql, retry);
        return;
      }
@@ -381,41 +379,41 @@ static void tscSetSlidingWindowInfo(SSqlObj *pSql, SSqlStream *pStream) {
  
  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
  
-  if (pQueryInfo->nAggTimeInterval < minIntervalTime) {
+  if (pQueryInfo->intervalTime < minIntervalTime) {
    tscWarn("%p stream:%p, original sample interval:%ld too small, reset to:%" PRId64 "", pSql, pStream,
-            pQueryInfo->nAggTimeInterval, minIntervalTime);
-    pQueryInfo->nAggTimeInterval = minIntervalTime;
+            pQueryInfo->intervalTime, minIntervalTime);
+    pQueryInfo->intervalTime = minIntervalTime;
  }

-  pStream->interval = pQueryInfo->nAggTimeInterval;  // it shall be derived from sql string
+  pStream->interval = pQueryInfo->intervalTime;  // it shall be derived from sql string

-  if (pQueryInfo->nSlidingTime == 0) {
-    pQueryInfo->nSlidingTime = pQueryInfo->nAggTimeInterval;
+  if (pQueryInfo->slidingTime == 0) {
+    pQueryInfo->slidingTime = pQueryInfo->intervalTime;
  }

  int64_t minSlidingTime =
      (pStream->precision == TSDB_TIME_PRECISION_MICRO) ? tsMinSlidingTime * 1000L : tsMinSlidingTime;

-  if (pQueryInfo->nSlidingTime == -1) {
-    pQueryInfo->nSlidingTime = pQueryInfo->nAggTimeInterval;
-  } else if (pQueryInfo->nSlidingTime < minSlidingTime) {
+  if (pQueryInfo->slidingTime == -1) {
+    pQueryInfo->slidingTime = pQueryInfo->intervalTime;
+  } else if (pQueryInfo->slidingTime < minSlidingTime) {
    tscWarn("%p stream:%p, original sliding value:%" PRId64 " too small, reset to:%" PRId64 "", pSql, pStream,
-        pQueryInfo->nSlidingTime, minSlidingTime);
+        pQueryInfo->slidingTime, minSlidingTime);

-    pQueryInfo->nSlidingTime = minSlidingTime;
+    pQueryInfo->slidingTime = minSlidingTime;
  }

-  if (pQueryInfo->nSlidingTime > pQueryInfo->nAggTimeInterval) {
+  if (pQueryInfo->slidingTime > pQueryInfo->intervalTime) {
    tscWarn("%p stream:%p, sliding value:%" PRId64 " can not be larger than interval range, reset to:%" PRId64 "", pSql, pStream,
-            pQueryInfo->nSlidingTime, pQueryInfo->nAggTimeInterval);
+            pQueryInfo->slidingTime, pQueryInfo->intervalTime);

-    pQueryInfo->nSlidingTime = pQueryInfo->nAggTimeInterval;
+    pQueryInfo->slidingTime = pQueryInfo->intervalTime;
  }

-  pStream->slidingTime = pQueryInfo->nSlidingTime;
+  pStream->slidingTime = pQueryInfo->slidingTime;
  
-  pQueryInfo->nAggTimeInterval = 0; // clear the interval value to avoid the force time window split by query processor
-  pQueryInfo->nSlidingTime = 0;
+  pQueryInfo->intervalTime = 0; // clear the interval value to avoid the force time window split by query processor
+  pQueryInfo->slidingTime = 0;
 }

 static int64_t tscGetStreamStartTimestamp(SSqlObj *pSql, SSqlStream *pStream, int64_t stime) {

--- a/src/client/src/tscSub.c
+++ b/src/client/src/tscSub.c
@@ -44,7 +44,7 @@ typedef struct SSub {
  int                     interval;
  TAOS_SUBSCRIBE_CALLBACK fp;
  void *                  param;
-  int                     numOfMeters;
+  int                     numOfTables;
  SSubscriptionProgress * progress;
 } SSub;

@@ -62,7 +62,7 @@ TSKEY tscGetSubscriptionProgress(void* sub, int64_t uid) {
    return 0;

  SSub* pSub = (SSub*)sub;
-  for (int s = 0, e = pSub->numOfMeters; s < e;) {
+  for (int s = 0, e = pSub->numOfTables; s < e;) {
    int m = (s + e) / 2;
    SSubscriptionProgress* p = pSub->progress + m;
    if (p->uid > uid)
@@ -81,7 +81,7 @@ void tscUpdateSubscriptionProgress(void* sub, int64_t uid, TSKEY ts) {
    return;

  SSub* pSub = (SSub*)sub;
-  for (int s = 0, e = pSub->numOfMeters; s < e;) {
+  for (int s = 0, e = pSub->numOfTables; s < e;) {
    int m = (s + e) / 2;
    SSubscriptionProgress* p = pSub->progress + m;
    if (p->uid > uid)
@@ -176,43 +176,43 @@ int tscUpdateSubscription(STscObj* pObj, SSub* pSub) {
  }

  SMeterMetaInfo *pMeterMetaInfo = tscGetMeterMetaInfo(pCmd, 0, 0);
-  int numOfMeters = 0;
+  int numOfTables = 0;
  if (!UTIL_METER_IS_NOMRAL_METER(pMeterMetaInfo)) {
-    SMetricMeta* pMetricMeta = pMeterMetaInfo->pMetricMeta;
+    SSuperTableMeta* pMetricMeta = pMeterMetaInfo->pMetricMeta;
    for (int32_t i = 0; i < pMetricMeta->numOfVnodes; i++) {
      SVnodeSidList *pVnodeSidList = tscGetVnodeSidList(pMetricMeta, i);
-      numOfMeters += pVnodeSidList->numOfSids;
+      numOfTables += pVnodeSidList->numOfSids;
    }
  }

-  SSubscriptionProgress* progress = (SSubscriptionProgress*)calloc(numOfMeters, sizeof(SSubscriptionProgress));
+  SSubscriptionProgress* progress = (SSubscriptionProgress*)calloc(numOfTables, sizeof(SSubscriptionProgress));
  if (progress == NULL) {
    tscError("failed to allocate memory for progress: %s", pSub->topic);
    return 0;
  }

  if (UTIL_METER_IS_NOMRAL_METER(pMeterMetaInfo)) {
-    numOfMeters = 1;
+    numOfTables = 1;
    int64_t uid = pMeterMetaInfo->pMeterMeta->uid;
    progress[0].uid = uid;
    progress[0].key = tscGetSubscriptionProgress(pSub, uid);
  } else {
-    SMetricMeta* pMetricMeta = pMeterMetaInfo->pMetricMeta;
-    numOfMeters = 0;
+    SSuperTableMeta* pMetricMeta = pMeterMetaInfo->pMetricMeta;
+    numOfTables = 0;
    for (int32_t i = 0; i < pMetricMeta->numOfVnodes; i++) {
      SVnodeSidList *pVnodeSidList = tscGetVnodeSidList(pMetricMeta, i);
      for (int32_t j = 0; j < pVnodeSidList->numOfSids; j++) {
-        SMeterSidExtInfo *pMeterInfo = tscGetMeterSidInfo(pVnodeSidList, j);
+        STableSidExtInfo *pMeterInfo = tscGetMeterSidInfo(pVnodeSidList, j);
        int64_t uid = pMeterInfo->uid;
-        progress[numOfMeters].uid = uid;
-        progress[numOfMeters++].key = tscGetSubscriptionProgress(pSub, uid);
+        progress[numOfTables].uid = uid;
+        progress[numOfTables++].key = tscGetSubscriptionProgress(pSub, uid);
      }
    }
-    qsort(progress, numOfMeters, sizeof(SSubscriptionProgress), tscCompareSubscriptionProgress);
+    qsort(progress, numOfTables, sizeof(SSubscriptionProgress), tscCompareSubscriptionProgress);
  }

  free(pSub->progress);
-  pSub->numOfMeters = numOfMeters;
+  pSub->numOfTables = numOfTables;
  pSub->progress = progress;

  pSub->lastSyncTime = taosGetTimestampMs();
@@ -257,9 +257,9 @@ static int tscLoadSubscriptionProgress(SSub* pSub) {
    return 0;
  }

-  int numOfMeters = atoi(buf);
-  SSubscriptionProgress* progress = calloc(numOfMeters, sizeof(SSubscriptionProgress));
-  for (int i = 0; i < numOfMeters; i++) {
+  int numOfTables = atoi(buf);
+  SSubscriptionProgress* progress = calloc(numOfTables, sizeof(SSubscriptionProgress));
+  for (int i = 0; i < numOfTables; i++) {
    if (fgets(buf, sizeof(buf), fp) == NULL) {
      fclose(fp);
      free(progress);
@@ -273,10 +273,10 @@ static int tscLoadSubscriptionProgress(SSub* pSub) {

  fclose(fp);

-  qsort(progress, numOfMeters, sizeof(SSubscriptionProgress), tscCompareSubscriptionProgress);
-  pSub->numOfMeters = numOfMeters;
+  qsort(progress, numOfTables, sizeof(SSubscriptionProgress), tscCompareSubscriptionProgress);
+  pSub->numOfTables = numOfTables;
  pSub->progress = progress;
-  tscTrace("subscription progress loaded, %d tables: %s", numOfMeters, pSub->topic);
+  tscTrace("subscription progress loaded, %d tables: %s", numOfTables, pSub->topic);
  return 1;
 }

@@ -297,8 +297,8 @@ void tscSaveSubscriptionProgress(void* sub) {
  }

  fputs(pSub->pSql->sqlstr, fp);
-  fprintf(fp, "\n%d\n", pSub->numOfMeters);
-  for (int i = 0; i < pSub->numOfMeters; i++) {
+  fprintf(fp, "\n%d\n", pSub->numOfTables);
+  for (int i = 0; i < pSub->numOfTables; i++) {
    int64_t uid = pSub->progress[i].uid;
    TSKEY key = pSub->progress[i].key;
    fprintf(fp, "%" PRId64 ":%" PRId64 "\n", uid, key);
@@ -382,7 +382,6 @@ TAOS_RES *taos_consume(TAOS_SUB *tsub) {
      pRes->numOfRows = 1;
      pRes->numOfTotal = 0;
      pRes->qhandle = 0;
-      pSql->thandle = NULL;
      pSql->cmd.command = TSDB_SQL_SELECT;
      pQueryInfo->type = type;


--- a/src/client/src/tscSystem.c
+++ b/src/client/src/tscSystem.c
@@ -45,6 +45,7 @@ int     tsInsertHeadSize;
 extern int            tscEmbedded;
 int                   tscNumOfThreads;
 static pthread_once_t tscinit = PTHREAD_ONCE_INIT;
+static pthread_mutex_t tscMutex;

 extern int  tsTscEnableRecordSql;
 extern int  tsNumOfLogLines;
@@ -56,11 +57,64 @@ void tscCheckDiskUsage(void *para, void *unused) {
  taosTmrReset(tscCheckDiskUsage, 1000, NULL, tscTmr, &tscCheckDiskUsageTmr);
 }

+int32_t tscInitRpc(const char *user, const char *secret) {
+  SRpcInit rpcInit;
+  char secretEncrypt[32] = {0};
+  taosEncryptPass((uint8_t *)secret, strlen(secret), secretEncrypt);
+
+  pthread_mutex_lock(&tscMutex);
+  if (pVnodeConn == NULL) {
+    memset(&rpcInit, 0, sizeof(rpcInit));
+    rpcInit.localIp = tsLocalIp;
+    rpcInit.localPort = 0;
+    rpcInit.label = "TSC-vnode";
+    rpcInit.numOfThreads = tscNumOfThreads;
+    rpcInit.cfp = tscProcessMsgFromServer;
+    rpcInit.sessions = tsMaxVnodeConnections;
+    rpcInit.connType = TAOS_CONN_CLIENT;
+    rpcInit.user = user;
+    rpcInit.ckey = "key";
+    rpcInit.secret = secretEncrypt;
+
+    pVnodeConn = rpcOpen(&rpcInit);
+    if (pVnodeConn == NULL) {
+      tscError("failed to init connection to vnode");
+      pthread_mutex_unlock(&tscMutex);
+      return -1;
+    }
+  }
+
+  if (pTscMgmtConn == NULL) {
+    memset(&rpcInit, 0, sizeof(rpcInit));
+    rpcInit.localIp = tsLocalIp;
+    rpcInit.localPort = 0;
+    rpcInit.label = "TSC-mgmt";
+    rpcInit.numOfThreads = 1;
+    rpcInit.cfp = tscProcessMsgFromServer;
+    rpcInit.sessions = tsMaxMgmtConnections;
+    rpcInit.connType = TAOS_CONN_CLIENT;
+    rpcInit.idleTime = 2000;
+    rpcInit.user = "root";
+    rpcInit.ckey = "key";
+    rpcInit.secret = secretEncrypt;
+
+    pTscMgmtConn = rpcOpen(&rpcInit);
+    if (pTscMgmtConn == NULL) {
+      tscError("failed to init connection to mgmt");
+      pthread_mutex_unlock(&tscMutex);
+      return -1;
+    }
+  }
+
+  pthread_mutex_unlock(&tscMutex);
+  return 0;
+}
+
 void taos_init_imp() {
  char        temp[128];
  struct stat dirstat;
-  SRpcInit    rpcInit;

+  pthread_mutex_init(&tscMutex, NULL);
  srand(taosGetTimestampSec());
  deltaToUtcInitOnce();

@@ -96,12 +150,12 @@ void taos_init_imp() {
    taosInitNote(tsNumOfLogLines / 10, 1, (char*)"tsc_note");
  }

-  tscMgmtIpList.index = 0;
+  tscMgmtIpList.inUse = 0;
  tscMgmtIpList.port = tsMgmtShellPort;
  tscMgmtIpList.numOfIps = 1;
  tscMgmtIpList.ip[0] = inet_addr(tsMasterIp);

-  if (tsSecondIp[0]) {
+  if (tsSecondIp[0] && strcmp(tsSecondIp, tsMasterIp) != 0) {
    tscMgmtIpList.numOfIps = 2;
    tscMgmtIpList.ip[1] = inet_addr(tsSecondIp);
  }
@@ -124,34 +178,6 @@ void taos_init_imp() {
    return;
  }

-  memset(&rpcInit, 0, sizeof(rpcInit));
-  rpcInit.localIp = tsLocalIp;
-  rpcInit.localPort = 0;
-  rpcInit.label = "TSC-vnode";
-  rpcInit.numOfThreads = tscNumOfThreads;
-  rpcInit.afp = tscProcessMsgFromServer;
-  rpcInit.sessions = tsMaxVnodeConnections;
-  rpcInit.connType = TAOS_CONN_SOCKET_TYPE_C();
-  pVnodeConn = rpcOpen(&rpcInit);
-  if (pVnodeConn == NULL) {
-    tscError("failed to init connection to vnode");
-    return;
-  }
-
-  memset(&rpcInit, 0, sizeof(rpcInit));
-  rpcInit.localIp = tsLocalIp;
-  rpcInit.localPort = 0;
-  rpcInit.label = "TSC-mgmt";
-  rpcInit.numOfThreads = 1;
-  rpcInit.afp = tscProcessMsgFromServer;
-  rpcInit.sessions = tsMaxMgmtConnections;
-  rpcInit.connType = TAOS_CONN_SOCKET_TYPE_C();
-  pTscMgmtConn = rpcOpen(&rpcInit);
-  if (pTscMgmtConn == NULL) {
-    tscError("failed to init connection to mgmt");
-    return;
-  }
-
  tscTmr = taosTmrInit(tsMaxMgmtConnections * 2, 200, 60000, "TSC");
  if(0 == tscEmbedded){
    taosTmrReset(tscCheckDiskUsage, 10, NULL, tscTmr, &tscCheckDiskUsageTmr);      
@@ -319,10 +345,10 @@ static int taos_options_imp(TSDB_OPTION option, const char *pStr) {
      assert(cfg != NULL);
    
      if (cfg->cfgStatus <= TSDB_CFG_CSTATUS_OPTION) {
-        if (strcasecmp(pStr, TAOS_SOCKET_TYPE_NAME_UDP) != 0 && strcasecmp(pStr, TAOS_SOCKET_TYPE_NAME_TCP) != 0) {
-          tscError("only 'tcp' or 'udp' allowed for configuring the socket type");
-          return -1;
-        }
+//        if (strcasecmp(pStr, TAOS_SOCKET_TYPE_NAME_UDP) != 0 && strcasecmp(pStr, TAOS_SOCKET_TYPE_NAME_TCP) != 0) {
+//          tscError("only 'tcp' or 'udp' allowed for configuring the socket type");
+//          return -1;
+//        }

        strncpy(tsSocketType, pStr, tListLen(tsSocketType));
        cfg->cfgStatus = TSDB_CFG_CSTATUS_OPTION;

--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
--- a/src/connector/jdbc/CMakeLists.txt
+++ b/src/connector/jdbc/CMakeLists.txt
@@ -8,7 +8,7 @@ IF (TD_MVN_INSTALLED)
  ADD_CUSTOM_COMMAND(OUTPUT ${JDBC_CMD_NAME}
    POST_BUILD
    COMMAND mvn -Dmaven.test.skip=true install -f ${CMAKE_CURRENT_SOURCE_DIR}/pom.xml
-    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_SOURCE_DIR}/target/taos-jdbcdriver-1.0.2-dist.jar ${LIBRARY_OUTPUT_PATH}
+    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_SOURCE_DIR}/target/taos-jdbcdriver-1.0.3-dist.jar ${LIBRARY_OUTPUT_PATH}
    COMMAND mvn -Dmaven.test.skip=true clean -f ${CMAKE_CURRENT_SOURCE_DIR}/pom.xml
    COMMENT "build jdbc driver")
  ADD_CUSTOM_TARGET(${JDBC_TARGET_NAME} ALL WORKING_DIRECTORY ${EXECUTABLE_OUTPUT_PATH} DEPENDS ${JDBC_CMD_NAME})

--- a/src/connector/jdbc/pom.xml
+++ b/src/connector/jdbc/pom.xml
@@ -4,7 +4,7 @@

 	<groupId>com.taosdata.jdbc</groupId>
 	<artifactId>taos-jdbcdriver</artifactId>
-	<version>1.0.2</version>
+	<version>1.0.3</version>
 	<packaging>jar</packaging>

 	<name>JDBCDriver</name>

--- a/src/dnode/CMakeLists.txt
+++ b/src/dnode/CMakeLists.txt
@@ -10,7 +10,7 @@ IF ((TD_LINUX_64) OR (TD_LINUX_32 AND TD_ARM))
  AUX_SOURCE_DIRECTORY(src SRC)

  ADD_EXECUTABLE(taosd ${SRC})
-  TARGET_LINK_LIBRARIES(taosd mnode sdb taos_static monitor http)
+  TARGET_LINK_LIBRARIES(taosd mnode sdb taos_static monitor http tsdb)

  #IF (TD_CLUSTER)
  #  TARGET_LINK_LIBRARIES(taosd dcluster)

--- a/src/dnode/inc/dnodeMgmt.h
+++ b/src/dnode/inc/dnodeMgmt.h
@@ -23,12 +23,15 @@ extern "C" {
 #include <stdint.h>
 #include <stdbool.h>

-void dnodeProcessMsgFromMgmt(int8_t *pCont, int32_t contLen, int32_t msgType, void *pConn);
-void dnodeSendVpeerCfgMsg(int32_t vnode);
-void dnodeSendMeterCfgMsg(int32_t vnode, int32_t sid);
+int32_t dnodeInitMgmt();
+void dnodeInitMgmtIp();

-extern int32_t (*dnodeSendMsgToMnode)(int8_t *pCont, int32_t contLen, int8_t msgType);
-extern int32_t (*dnodeSendSimpleRspToMnode)(void *pConn, int32_t msgType, int32_t code);
+void dnodeProcessMsgFromMgmt(char msgType, void *pCont, int32_t contLen, void *pConn, int32_t code);
+void dnodeSendMsgToMnode(int8_t msgType, void *pCont, int32_t contLen);
+void dnodeSendRspToMnode(void *pConn, int8_t msgType, int32_t code, void *pCont, int32_t contLen);
+
+void dnodeSendVnodeCfgMsg(int32_t vnode);
+void dnodeSendTableCfgMsg(int32_t vnode, int32_t sid);

 #ifdef __cplusplus
 }

--- a/src/dnode/inc/dnodeRead.h
+++ b/src/dnode/inc/dnodeRead.h
@@ -25,31 +25,21 @@ extern "C" {
 #include "taosdef.h"
 #include "taosmsg.h"

-/*
- * Clear query information associated with this connection
- */
-void dnodeFreeQInfo(void *pConn);
-
-/*
- * Clear all query informations
- */
-void dnodeFreeQInfos();
-
 /*
 * handle query message, and the result is returned by callback function
 */
-void dnodeQueryData(SQueryMeterMsg *pQuery, void *pConn, void (*callback)(int32_t code, void *pQInfo, void *pConn));
+void dnodeQueryData(SQueryTableMsg *pQuery, void *pConn, void (*callback)(int32_t code, void *pQInfo, void *pConn));

 /*
 * Dispose retrieve msg, and the result will passed through callback function
 */
 typedef void (*SDnodeRetrieveCallbackFp)(int32_t code, void *pQInfo, void *pConn);
-void dnodeRetrieveData(SRetrieveMeterMsg *pRetrieve, void *pConn, SDnodeRetrieveCallbackFp callbackFp);
+void dnodeRetrieveData(SRetrieveTableMsg *pRetrieve, void *pConn, SDnodeRetrieveCallbackFp callbackFp);

 /*
 * Fill retrieve result according to query info
 */
-int32_t dnodeGetRetrieveData(void *pQInfo, SRetrieveMeterRsp *retrievalRsp);
+int32_t dnodeGetRetrieveData(void *pQInfo, SRetrieveTableRsp *pRetrieve);

 /*
 * Get the size of retrieve result according to query info

--- a/src/dnode/inc/dnodeSystem.h
+++ b/src/dnode/inc/dnodeSystem.h
@@ -33,11 +33,11 @@ extern int32_t (*dnodeInitPeers)(int32_t numOfThreads);
 extern int32_t (*dnodeCheckSystem)();
 extern int32_t (*dnodeInitStorage)();
 extern void (*dnodeCleanupStorage)();
-extern void (*dnodeParseParameterK)();
 extern int32_t tsMaxQueues;
 extern void ** tsRpcQhandle;
 extern void *tsQueryQhandle;
 extern void *tsDnodeMgmtQhandle;
+extern void *tsDnodeTmr;

 int32_t dnodeInitSystem();
 void dnodeCleanUpSystem();

--- a/src/dnode/inc/dnodeVnodeMgmt.h
+++ b/src/dnode/inc/dnodeVnodeMgmt.h
@@ -45,7 +45,7 @@ bool dnodeCheckVnodeExist(int32_t vid);
 * Create vnode with specified configuration and open it
 * if exist, config it
 */
-int32_t dnodeCreateVnode(int32_t vnode, SVPeersMsg *cfg);
+int32_t dnodeCreateVnode(SCreateVnodeMsg *pVnode);

 /*
 * Remove vnode from local repository
@@ -56,7 +56,9 @@ int32_t dnodeDropVnode(int32_t vnode);
 * Get the vnode object that has been opened
 */
 //tsdb_repo_t* dnodeGetVnode(int vid);
-void* dnodeGetVnode(int vid);
+void* dnodeGetVnode(int32_t vnode);
+
+int32_t dnodeGetVnodesNum();

 /*
 * get the status of vnode

--- a/src/dnode/inc/dnodeWrite.h
+++ b/src/dnode/inc/dnodeWrite.h
@@ -38,23 +38,23 @@ void dnodeWriteData(SShellSubmitMsg *pSubmit, void *pConn, void (*callback)(SShe
 * Create table with specified configuration and open it
 * if table already exist, update its schema and tag
 */
-int32_t dnodeCreateTable(SDCreateTableMsg *table);
+int32_t dnodeCreateTable(SDCreateTableMsg *pTable);

 /*
 * Remove table from local repository
 */
-int32_t dnodeDropTable(int32_t vnode, int32_t sid, uint64_t uid);
+int32_t dnodeDropTable(SDRemoveTableMsg *pTable);

 /*
 * Create stream
 * if stream already exist, update it
 */
-int32_t dnodeCreateStream(SAlterStreamMsg *stream);
+int32_t dnodeCreateStream(SDAlterStreamMsg *pStream);

 /*
 * Remove all child tables of supertable from local repository
 */
-int32_t dnodeDropSuperTable(uint64_t stableUid);
+int32_t dnodeDropSuperTable(SDRemoveSuperTableMsg *pStable);

 #ifdef __cplusplus
 }

--- a/src/dnode/src/dnodeMgmt.c
+++ b/src/dnode/src/dnodeMgmt.c
--- a/src/dnode/src/dnodeModule.c
+++ b/src/dnode/src/dnodeModule.c
@@ -68,38 +68,6 @@ void dnodeCleanUpModules() {
  }
 }

-void dnodeProcessModuleStatus(uint32_t status) {
-  if (dnodeGetRunStatus() != TSDB_DNODE_RUN_STATUS_RUNING) {
-    return;
-  }
-
-  int news = status;
-  int olds = tsModuleStatus;
-
-  for (int moduleType = 0; moduleType < TSDB_MOD_MAX; ++moduleType) {
-    int newStatus = news & (1 << moduleType);
-    int oldStatus = olds & (1 << moduleType);
-
-    if (oldStatus > 0) {
-      if (newStatus == 0) {
-        if (tsModule[moduleType].stopFp) {
-          dPrint("module:%s is stopped on this node", tsModule[moduleType].name);
-          (*tsModule[moduleType].stopFp)();
-        }
-      }
-    } else if (oldStatus == 0) {
-      if (newStatus > 0) {
-        if (tsModule[moduleType].startFp) {
-          dPrint("module:%s is started on this node", tsModule[moduleType].name);
-          (*tsModule[moduleType].startFp)();
-        }
-      }
-    } else {
-    }
-  }
-  tsModuleStatus = status;
-}
-
 int32_t dnodeInitModules() {
  for (int mod = 0; mod < TSDB_MOD_MAX; ++mod) {
    if (tsModule[mod].num != 0 && tsModule[mod].initFp) {
@@ -121,10 +89,6 @@ void dnodeStartModulesImp() {
      }
    }
  }
-
-  if (tsModule[TSDB_MOD_MGMT].num != 0 && tsModule[TSDB_MOD_MGMT].cleanUpFp) {
-    (*tsModule[TSDB_MOD_MGMT].cleanUpFp)();
-  }
 }

 void (*dnodeStartModules)() = dnodeStartModulesImp;
--- a/src/dnode/src/dnodeRead.c
+++ b/src/dnode/src/dnodeRead.c
@@ -22,34 +22,33 @@
 #include "dnodeRead.h"
 #include "dnodeSystem.h"

-void dnodeFreeQInfo(void *pConn) {}
-
-void dnodeFreeQInfos() {}
-
-void dnodeQueryData(SQueryMeterMsg *pQuery, void *pConn, void (*callback)(int32_t code, void *pQInfo, void *pConn)) {
-  void *pQInfo = NULL;
-  int code = TSDB_CODE_SUCCESS;
-  callback(code, pConn, pQInfo);
+void dnodeQueryData(SQueryTableMsg *pQuery, void *pConn, void (*callback)(int32_t code, void *pQInfo, void *pConn)) {
+  dTrace("conn:%p, query msg is disposed", pConn);
+  void *pQInfo = 100;
+  callback(TSDB_CODE_SUCCESS, pQInfo, pConn);
 }

 static void dnodeExecuteRetrieveData(SSchedMsg *pSched) {
-  //SRetrieveMeterMsg *pRetrieve = (SRetrieveMeterMsg *)pSched->msg;
  SDnodeRetrieveCallbackFp callback = (SDnodeRetrieveCallbackFp)pSched->thandle;
+  SRetrieveTableMsg *pRetrieve = pSched->msg;
  void *pConn = pSched->ahandle;

+  dTrace("conn:%p, retrieve msg is disposed, qhandle:%" PRId64, pConn, pRetrieve->qhandle);
+
  //examples
-  int32_t code = TSDB_CODE_INVALID_QHANDLE;
-  void *pQInfo = NULL; //get from pConn
-  (*callback)(code, pQInfo, pConn);
+  int32_t code = TSDB_CODE_SUCCESS;
+  void *pQInfo = (void*)pRetrieve->qhandle;

-  //TODO build response here
+  (*callback)(code, pQInfo, pConn);

  free(pSched->msg);
 }

-void dnodeRetrieveData(SRetrieveMeterMsg *pRetrieve, void *pConn, SDnodeRetrieveCallbackFp callbackFp) {
-  int8_t *msg = malloc(sizeof(SRetrieveMeterMsg));
-  memcpy(msg, pRetrieve, sizeof(SRetrieveMeterMsg));
+void dnodeRetrieveData(SRetrieveTableMsg *pRetrieve, void *pConn, SDnodeRetrieveCallbackFp callbackFp) {
+  dTrace("conn:%p, retrieve msg is received", pConn);
+
+  void *msg = malloc(sizeof(SRetrieveTableMsg));
+  memcpy(msg, pRetrieve, sizeof(SRetrieveTableMsg));

  SSchedMsg schedMsg;
  schedMsg.msg     = msg;
@@ -59,12 +58,15 @@ void dnodeRetrieveData(SRetrieveMeterMsg *pRetrieve, void *pConn, SDnodeRetrieve
  taosScheduleTask(tsQueryQhandle, &schedMsg);
 }

-int32_t dnodeGetRetrieveData(void *pQInfo, SRetrieveMeterRsp *retrievalRsp) {
+int32_t dnodeGetRetrieveData(void *pQInfo, SRetrieveTableRsp *pRetrieve) {
+  dTrace("qInfo:%p, data is retrieved");
+  pRetrieve->numOfRows = 0;
  return 0;
 }

 int32_t dnodeGetRetrieveDataSize(void *pQInfo) {
-  return 0;
+  dTrace("qInfo:%p, contLen is 100");
+  return 100;
 }


--- a/src/dnode/src/dnodeService.c
+++ b/src/dnode/src/dnodeService.c
@@ -19,6 +19,8 @@
 #include "tglobalcfg.h"
 #include "dnodeSystem.h"

+void (*dnodeParseParameterKFp)() = NULL;
+
 /*
 * Termination handler
 */
@@ -63,7 +65,9 @@ int main(int argc, char *argv[]) {
      printf("buildinfo: %s\n", buildinfo);
      return 0;
    } else if (strcmp(argv[i], "-k") == 0) {
-      dnodeParseParameterK();
+      if (dnodeParseParameterKFp) {
+        dnodeParseParameterKFp();
+      }
 #ifdef TAOS_MEM_CHECK
    } else if (strcmp(argv[i], "--alloc-random-fail") == 0) {
      if ((i < argc - 1) && (argv[i+1][0] != '-')) {

--- a/src/dnode/src/dnodeShell.c
+++ b/src/dnode/src/dnodeShell.c
--- a/src/dnode/src/dnodeSystem.c
+++ b/src/dnode/src/dnodeSystem.c
--- a/src/dnode/src/dnodeVnodeMgmt.c
+++ b/src/dnode/src/dnodeVnodeMgmt.c
--- a/src/dnode/src/dnodeWrite.c
+++ b/src/dnode/src/dnodeWrite.c
--- a/src/inc/dnode.h
+++ b/src/inc/dnode.h
--- a/src/inc/mnode.h
+++ b/src/inc/mnode.h
--- a/src/inc/sdb.h
+++ b/src/inc/sdb.h
--- a/src/inc/taosdef.h
+++ b/src/inc/taosdef.h
@@ -86,7 +86,7 @@ extern "C" {
 #define TS_PATH_DELIMITER_LEN     1

 #define TSDB_METER_ID_LEN_MARGIN  10
-#define TSDB_TABLE_ID_LEN         (TSDB_DB_NAME_LEN+TSDB_METER_NAME_LEN+2*TS_PATH_DELIMITER_LEN+TSDB_USERID_LEN+TSDB_METER_ID_LEN_MARGIN) //TSDB_DB_NAME_LEN+TSDB_METER_NAME_LEN+2*strlen(TS_PATH_DELIMITER)+strlen(USERID)
+#define TSDB_TABLE_ID_LEN         (TSDB_DB_NAME_LEN+TSDB_TABLE_NAME_LEN+2*TS_PATH_DELIMITER_LEN+TSDB_USERID_LEN+TSDB_METER_ID_LEN_MARGIN) //TSDB_DB_NAME_LEN+TSDB_TABLE_NAME_LEN+2*strlen(TS_PATH_DELIMITER)+strlen(USERID)
 #define TSDB_UNI_LEN              24
 #define TSDB_USER_LEN             TSDB_UNI_LEN
 #define TSDB_ACCT_LEN             TSDB_UNI_LEN
@@ -95,7 +95,7 @@ extern "C" {
 #define TSDB_MAX_COLUMNS          256
 #define TSDB_MIN_COLUMNS          2       //PRIMARY COLUMN(timestamp) + other columns

-#define TSDB_METER_NAME_LEN       64
+#define TSDB_TABLE_NAME_LEN       64
 #define TSDB_DB_NAME_LEN          32
 #define TSDB_COL_NAME_LEN         64
 #define TSDB_MAX_SAVED_SQL_LEN    TSDB_MAX_COLUMNS * 16

--- a/src/inc/taoserror.h
+++ b/src/inc/taoserror.h
@@ -163,6 +163,9 @@ TAOS_DEFINE_ERROR(TSDB_CODE_FAILED_TO_LOCK_RESOURCES,   0, 117, "failed to lock
 TAOS_DEFINE_ERROR(TSDB_CODE_TABLE_ID_MISMATCH,          0, 118, "table id mismatch")
 TAOS_DEFINE_ERROR(TSDB_CODE_QUERY_CACHE_ERASED,         0, 119, "query cache erased")
 TAOS_DEFINE_ERROR(TSDB_CODE_INVALID_MSG,                0, 120, "invalid message")
+TAOS_DEFINE_ERROR(TSDB_CODE_INVALID_TABLE_TYPE,         0, 121, "invalid table typee")
+TAOS_DEFINE_ERROR(TSDB_CODE_INVALID_MSG_VERSION,        0, 122, "invalid version of message")
+TAOS_DEFINE_ERROR(TSDB_CODE_DNODE_NOT_EXIST,            0, 123, "dnode not exist")

 #ifdef TAOS_ERROR_C
 };

--- a/src/inc/taosmsg.h
+++ b/src/inc/taosmsg.h
--- a/src/inc/tresultBuf.h
+++ b/src/inc/tresultBuf.h
--- a/src/inc/trpc.h
+++ b/src/inc/trpc.h
--- a/src/kit/shell/src/shellEngine.c
+++ b/src/kit/shell/src/shellEngine.c
--- a/src/kit/shell/src/shellMain.c
+++ b/src/kit/shell/src/shellMain.c
--- a/src/kit/taosdump/taosdump.c
+++ b/src/kit/taosdump/taosdump.c
--- a/src/mnode/CMakeLists.txt
+++ b/src/mnode/CMakeLists.txt
--- a/src/mnode/inc/mgmtAcct.h
+++ b/src/mnode/inc/mgmtAcct.h
--- a/src/mnode/inc/mgmtBalance.h
+++ b/src/mnode/inc/mgmtBalance.h
--- a/src/mnode/inc/mgmtChildTable.h
+++ b/src/mnode/inc/mgmtChildTable.h
--- a/src/mnode/inc/mgmtDb.h
+++ b/src/mnode/inc/mgmtDb.h
--- a/src/mnode/inc/mgmtDnode.h
+++ b/src/mnode/inc/mgmtDnode.h
--- a/src/mnode/inc/mgmtDnodeInt.h
+++ b/src/mnode/inc/mgmtDnodeInt.h
--- a/src/mnode/inc/mgmtGrant.h
+++ b/src/mnode/inc/mgmtGrant.h
--- a/src/mnode/inc/mgmtMnode.h
+++ b/src/mnode/inc/mgmtMnode.h
--- a/src/mnode/inc/mgmtNormalTable.h
+++ b/src/mnode/inc/mgmtNormalTable.h
--- a/src/mnode/inc/mgmtProfile.h
+++ b/src/mnode/inc/mgmtProfile.h
--- a/src/mnode/inc/mgmtShell.h
+++ b/src/mnode/inc/mgmtShell.h
--- a/src/mnode/inc/mgmtSuperTable.h
+++ b/src/mnode/inc/mgmtSuperTable.h
--- a/src/mnode/inc/mgmtSystem.h
+++ b/src/mnode/inc/mgmtSystem.h
--- a/src/mnode/inc/mgmtTable.h
+++ b/src/mnode/inc/mgmtTable.h
--- a/src/mnode/inc/mgmtUser.h
+++ b/src/mnode/inc/mgmtUser.h
--- a/src/mnode/inc/mgmtVgroup.h
+++ b/src/mnode/inc/mgmtVgroup.h
--- a/src/mnode/src/mgmtAcct.c
+++ b/src/mnode/src/mgmtAcct.c
--- a/src/mnode/src/mgmtBalance.c
+++ b/src/mnode/src/mgmtBalance.c
--- a/src/mnode/src/mgmtChildTable.c
+++ b/src/mnode/src/mgmtChildTable.c
--- a/src/mnode/src/mgmtConn.c
+++ b/src/mnode/src/mgmtConn.c
--- a/src/mnode/src/mgmtDb.c
+++ b/src/mnode/src/mgmtDb.c
--- a/src/mnode/src/mgmtDnode.c
+++ b/src/mnode/src/mgmtDnode.c
--- a/src/mnode/src/mgmtDnodeInt.c
+++ b/src/mnode/src/mgmtDnodeInt.c
--- a/src/mnode/src/mgmtGrant.c
+++ b/src/mnode/src/mgmtGrant.c
--- a/src/mnode/src/mgmtMnode.c
+++ b/src/mnode/src/mgmtMnode.c
--- a/src/mnode/src/mgmtNormalTable.c
+++ b/src/mnode/src/mgmtNormalTable.c
--- a/src/mnode/src/mgmtProfile.c
+++ b/src/mnode/src/mgmtProfile.c
--- a/src/mnode/src/mgmtShell.c
+++ b/src/mnode/src/mgmtShell.c
--- a/src/mnode/src/mgmtStreamTable.c
+++ b/src/mnode/src/mgmtStreamTable.c
--- a/src/mnode/src/mgmtSuperTable.c
+++ b/src/mnode/src/mgmtSuperTable.c
--- a/src/mnode/src/mgmtSystem.c
+++ b/src/mnode/src/mgmtSystem.c
--- a/src/mnode/src/mgmtTable.c
+++ b/src/mnode/src/mgmtTable.c
--- a/src/mnode/src/mgmtUser.c
+++ b/src/mnode/src/mgmtUser.c
--- a/src/mnode/src/mgmtVgroup.c
+++ b/src/mnode/src/mgmtVgroup.c
--- a/src/os/linux/src/tsystem.c
+++ b/src/os/linux/src/tsystem.c
--- a/src/plugins/http/CMakeLists.txt
+++ b/src/plugins/http/CMakeLists.txt
--- a/src/plugins/http/inc/httpHandle.h
+++ b/src/plugins/http/inc/httpHandle.h
--- a/src/plugins/http/src/gcJson.c
+++ b/src/plugins/http/src/gcJson.c
--- a/src/plugins/http/src/httpSystem.c
+++ b/src/plugins/http/src/httpSystem.c
--- a/src/plugins/http/src/httpUtil.c
+++ b/src/plugins/http/src/httpUtil.c
--- a/src/plugins/http/src/tgHandle.c
+++ b/src/plugins/http/src/tgHandle.c
--- a/src/plugins/monitor/src/monitorSystem.c
+++ b/src/plugins/monitor/src/monitorSystem.c
--- a/src/rpc/src/rpcMain.c
+++ b/src/rpc/src/rpcMain.c
--- a/src/sdb/CMakeLists.txt
+++ b/src/sdb/CMakeLists.txt
--- a/src/sdb/inc/sdbint.h
+++ b/src/sdb/inc/sdbint.h
--- a/src/sdb/src/sdbEngine.c
+++ b/src/sdb/src/sdbEngine.c
--- a/src/sdb/src/sdbstr.c
+++ b/src/sdb/src/sdbstr.c
--- a/src/util/CMakeLists.txt
+++ b/src/util/CMakeLists.txt
--- a/src/util/inc/hash.h
+++ b/src/util/inc/hash.h
--- a/src/util/inc/sskiplist.h
+++ b/src/util/inc/sskiplist.h
--- a/src/mnode/inc/mgmtStreamTable.h
+++ b/src/mnode/inc/mgmtStreamTable.h
--- a/src/util/inc/tast.h
+++ b/src/util/inc/tast.h
--- a/src/util/inc/textbuffer.h
+++ b/src/util/inc/textbuffer.h
--- a/src/util/inc/tglobalcfg.h
+++ b/src/util/inc/tglobalcfg.h
--- a/src/util/inc/tlog.h
+++ b/src/util/inc/tlog.h
--- a/src/util/inc/tsched.h
+++ b/src/util/inc/tsched.h
--- a/src/util/inc/tschemautil.h
+++ b/src/util/inc/tschemautil.h
--- a/src/util/inc/tskiplist.h
+++ b/src/util/inc/tskiplist.h
--- a/src/util/inc/tsqlfunction.h
+++ b/src/util/inc/tsqlfunction.h
--- a/src/util/inc/tsystem.h
+++ b/src/util/inc/tsystem.h
--- a/src/util/src/hash.c
+++ b/src/util/src/hash.c
--- a/src/util/src/sskiplist.c
+++ b/src/util/src/sskiplist.c
--- a/src/util/src/tarray.c
+++ b/src/util/src/tarray.c
--- a/src/util/src/textbuffer.c
+++ b/src/util/src/textbuffer.c
--- a/src/util/src/tglobalcfg.c
+++ b/src/util/src/tglobalcfg.c
--- a/src/util/src/thistogram.c
+++ b/src/util/src/thistogram.c
--- a/src/util/src/tinterpolation.c
+++ b/src/util/src/tinterpolation.c
--- a/src/util/src/tresultBuf.c
+++ b/src/util/src/tresultBuf.c
--- a/src/util/src/tskiplist.c
+++ b/src/util/src/tskiplist.c
--- a/src/util/src/tstring.c
+++ b/src/util/src/tstring.c
--- a/src/vnode/CMakeLists.txt
+++ b/src/vnode/CMakeLists.txt
--- a/src/vnode/common/inc/dataformat.h
+++ b/src/vnode/common/inc/dataformat.h
--- a/src/vnode/common/inc/schema.h
+++ b/src/vnode/common/inc/schema.h
--- a/src/vnode/common/inc/type.h
+++ b/src/vnode/common/inc/type.h
--- a/src/vnode/common/src/dataformat.c
+++ b/src/vnode/common/src/dataformat.c
--- a/src/vnode/common/src/schema.c
+++ b/src/vnode/common/src/schema.c
--- a/src/vnode/detail/inc/vnode.h
+++ b/src/vnode/detail/inc/vnode.h
--- a/src/vnode/detail/inc/vnodeQueryImpl.h
+++ b/src/vnode/detail/inc/vnodeQueryImpl.h
--- a/src/vnode/detail/inc/vnodeRead.h
+++ b/src/vnode/detail/inc/vnodeRead.h
--- a/src/vnode/detail/src/vnodeQueryImpl.c
+++ b/src/vnode/detail/src/vnodeQueryImpl.c
--- a/src/vnode/detail/src/vnodeQueryProcess.c
+++ b/src/vnode/detail/src/vnodeQueryProcess.c
--- a/src/vnode/detail/src/vnodeRead.c
+++ b/src/vnode/detail/src/vnodeRead.c
--- a/src/vnode/detail/src/vnodeUtil.c
+++ b/src/vnode/detail/src/vnodeUtil.c
--- a/src/vnode/tests/CMakeLists.txt
+++ b/src/vnode/tests/CMakeLists.txt
--- a/src/vnode/tests/common/CMakeLists.txt
+++ b/src/vnode/tests/common/CMakeLists.txt
--- a/src/vnode/tests/common/commonDataTests.cpp
+++ b/src/vnode/tests/common/commonDataTests.cpp
--- a/src/vnode/tests/common/commonSChemaTests.cpp
+++ b/src/vnode/tests/common/commonSChemaTests.cpp
--- a/src/vnode/tests/tsdb/tsdbTests.cpp
+++ b/src/vnode/tests/tsdb/tsdbTests.cpp
--- a/src/vnode/tsdb/CMakeLists.txt
+++ b/src/vnode/tsdb/CMakeLists.txt
--- a/src/vnode/tsdb/inc/tsdb.h
+++ b/src/vnode/tsdb/inc/tsdb.h
--- a/src/vnode/tsdb/inc/tsdbCache.h
+++ b/src/vnode/tsdb/inc/tsdbCache.h
--- a/src/vnode/tsdb/inc/tsdbFile.h
+++ b/src/vnode/tsdb/inc/tsdbFile.h
--- a/src/vnode/tsdb/inc/tsdbMeta.h
+++ b/src/vnode/tsdb/inc/tsdbMeta.h
--- a/src/vnode/tsdb/src/tsdb.c
+++ b/src/vnode/tsdb/src/tsdb.c
--- a/src/vnode/tsdb/src/tsdbCache.c
+++ b/src/vnode/tsdb/src/tsdbCache.c
--- a/src/mnode/inc/mgmtConn.h
+++ b/src/mnode/inc/mgmtConn.h
--- a/src/vnode/tsdb/src/tsdbFileStore.c
+++ b/src/vnode/tsdb/src/tsdbFileStore.c
--- a/src/vnode/tsdb/src/tsdbMain.c
+++ b/src/vnode/tsdb/src/tsdbMain.c
--- a/src/vnode/tsdb/src/tsdbMeta.c
+++ b/src/vnode/tsdb/src/tsdbMeta.c
--- a/src/vnode/tests/tsdb/CMakeLists.txt
+++ b/src/vnode/tests/tsdb/CMakeLists.txt
--- a/src/vnode/tsdb/tests/tsdbTests.cpp
+++ b/src/vnode/tsdb/tests/tsdbTests.cpp
--- a/src/vnode/wal/inc/vnodewal.h
+++ b/src/vnode/wal/inc/vnodewal.h