Merge pull request #3826 from taosdata/feature/query

Feature/query

src/balance/src/balance.c

@@ -937,6 +937,7 @@ static int32_t balanceRetrieveScores(SShowObj *pShow, char *data, int32_t rows,
     mnodeDecDnodeRef(pDnode);
   }
 
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
   pShow->numOfReads += numOfRows;
   return numOfRows;
 }

src/client/inc/tscLocalMerge.h

@@ -72,17 +72,10 @@ typedef struct SLocalReducer {
   bool                   orderPrjOnSTable;   // projection query on stable
 } SLocalReducer;
 
-typedef struct SSubqueryState {
-  int32_t  numOfRemain;         // the number of remain unfinished subquery
-  int32_t  numOfTotal;          // the number of total sub-queries
-  uint64_t numOfRetrievedRows;  // total number of points in this query
-} SSubqueryState;
-
 typedef struct SRetrieveSupport {
   tExtMemBuffer **  pExtMemBuffer;     // for build loser tree
   tOrderDescriptor *pOrderDescriptor;
   SColumnModel *    pFinalColModel;    // colModel for final result
-  SSubqueryState *  pState;
   int32_t           subqueryIndex;     // index of current vnode in vnode list
   SSqlObj *         pParentSql;
   tFilePage *       localBuffer;       // temp buffer, there is a buffer for each vnode to

src/client/inc/tscUtil.h

@@ -66,7 +66,6 @@ typedef struct STidTags {
 #pragma pack(pop)
 
 typedef struct SJoinSupporter {
-  SSubqueryState* pState;
   SSqlObj*        pObj;           // parent SqlObj
   int32_t         subqueryIndex;  // index of sub query
   SInterval       interval;
@@ -207,8 +206,6 @@ void tscTagCondRelease(STagCond* pCond);
 
 void tscGetSrcColumnInfo(SSrcColumnInfo* pColInfo, SQueryInfo* pQueryInfo);
 
-void tscSetFreeHeatBeat(STscObj* pObj);
-bool tscShouldFreeHeartBeat(SSqlObj* pHb);
 bool tscShouldBeFreed(SSqlObj* pSql);
 
 STableMetaInfo* tscGetTableMetaInfoFromCmd(SSqlCmd *pCmd, int32_t subClauseIndex, int32_t tableIndex);

src/client/inc/tsclient.h

@@ -334,6 +334,12 @@ typedef struct STscObj {
   T_REF_DECLARE()
 } STscObj;
 
+typedef struct SSubqueryState {
+  int32_t          numOfRemain;         // the number of remain unfinished subquery
+  int32_t          numOfSub;            // the number of total sub-queries
+  uint64_t         numOfRetrievedRows;  // total number of points in this query
+} SSubqueryState;
+
 typedef struct SSqlObj {
   void            *signature;
   pthread_t        owner;        // owner of sql object, by which it is executed
@@ -355,10 +361,11 @@ typedef struct SSqlObj {
   tsem_t           rspSem;
   SSqlCmd          cmd;
   SSqlRes          res;
-  uint16_t         numOfSubs;
-  struct SSqlObj **pSubs;
-  struct SSqlObj * prev, *next;
 
+  SSubqueryState   subState;
+  struct SSqlObj **pSubs;
+
+  struct SSqlObj  *prev, *next;
   struct SSqlObj **self;
 } SSqlObj;
 

src/client/src/tscAsync.c

@@ -361,15 +361,6 @@ void tscProcessFetchRow(SSchedMsg *pMsg) {
   (*pSql->fetchFp)(pSql->param, pSql, pRes->tsrow);
 }
 
-void tscProcessAsyncRes(SSchedMsg *pMsg) {
-  SSqlObj *pSql = (SSqlObj *)pMsg->ahandle;
-  SSqlRes *pRes = &pSql->res;
-  assert(pSql->fp != NULL && pSql->fetchFp != NULL);
-
-  pSql->fp = pSql->fetchFp;
-  (*pSql->fp)(pSql->param, pSql, pRes->code);
-}
-
 // this function will be executed by queue task threads, so the terrno is not valid
 static void tscProcessAsyncError(SSchedMsg *pMsg) {
   void (*fp)() = pMsg->ahandle;
@@ -393,22 +384,15 @@ void tscQueueAsyncRes(SSqlObj *pSql) {
   if (pSql == NULL || pSql->signature != pSql) {
     tscDebug("%p SqlObj is freed, not add into queue async res", pSql);
     return;
-  } else {
-    tscError("%p add into queued async res, code:%s", pSql, tstrerror(pSql->res.code));
   }
 
-  SSchedMsg schedMsg = { 0 };
+  tscError("%p add into queued async res, code:%s", pSql, tstrerror(pSql->res.code));
-  schedMsg.fp = tscProcessAsyncRes;
-  schedMsg.ahandle = pSql;
-  schedMsg.thandle = (void *)1;
-  schedMsg.msg = NULL;
-  taosScheduleTask(tscQhandle, &schedMsg);
-}
 
-void tscProcessAsyncFree(SSchedMsg *pMsg) {
+  SSqlRes *pRes = &pSql->res;
-  SSqlObj *pSql = (SSqlObj *)pMsg->ahandle;
+  assert(pSql->fp != NULL && pSql->fetchFp != NULL);
-  tscDebug("%p sql is freed", pSql);
+
-  taos_free_result(pSql);
+  pSql->fp = pSql->fetchFp;
+  (*pSql->fp)(pSql->param, pSql, pRes->code);
 }
 
 int tscSendMsgToServer(SSqlObj *pSql);

src/client/src/tscLocalMerge.c

@@ -639,7 +639,7 @@ int32_t tscLocalReducerEnvCreate(SSqlObj *pSql, tExtMemBuffer ***pMemBuffer, tOr
   SQueryInfo *    pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);
   STableMetaInfo *pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
 
-  (*pMemBuffer) = (tExtMemBuffer **)malloc(POINTER_BYTES * pSql->numOfSubs);
+  (*pMemBuffer) = (tExtMemBuffer **)malloc(POINTER_BYTES * pSql->subState.numOfSub);
   if (*pMemBuffer == NULL) {
     tscError("%p failed to allocate memory", pSql);
     pRes->code = TSDB_CODE_TSC_OUT_OF_MEMORY;

src/client/src/tscProfile.c

@@ -242,6 +242,7 @@ int tscBuildQueryStreamDesc(void *pMsg, STscObj *pObj) {
     pQdesc->stime = htobe64(pSql->stime);
     pQdesc->queryId = htonl(pSql->queryId);
     pQdesc->useconds = htobe64(pSql->res.useconds);
+    pQdesc->qHandle = htobe64(pSql->res.qhandle);
 
     pHeartbeat->numOfQueries++;
     pQdesc++;

src/client/src/tscSQLParser.c

@@ -1605,8 +1605,8 @@ int32_t addProjectionExprAndResultField(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, t
   return TSDB_CODE_SUCCESS;
 }
 
-static int32_t setExprInfoForFunctions(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SSchema* pSchema, SConvertFunc cvtFunc, char* aliasName,
+static int32_t setExprInfoForFunctions(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SSchema* pSchema, SConvertFunc cvtFunc,
-                                       int32_t resColIdx, SColumnIndex* pColIndex) {
+    char* aliasName, int32_t resColIdx, SColumnIndex* pColIndex, bool finalResult) {
   const char* msg1 = "not support column types";
 
   int16_t type = 0;
@@ -1652,8 +1652,13 @@ static int32_t setExprInfoForFunctions(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SS
   SColumnIndex index = {.tableIndex = pColIndex->tableIndex, .columnIndex = PRIMARYKEY_TIMESTAMP_COL_INDEX};
   tscColumnListInsert(pQueryInfo->colList, &index);
 
+  // if it is not in the final result, do not add it
   SColumnList ids = getColumnList(1, pColIndex->tableIndex, pColIndex->columnIndex);
+  if (finalResult) {
     insertResultField(pQueryInfo, resColIdx, &ids, bytes, (int8_t)type, columnName, pExpr);
+  } else {
+    tscColumnListInsert(pQueryInfo->colList, &(ids.ids[0]));
+  }
 
   return TSDB_CODE_SUCCESS;
 }
@@ -1928,7 +1933,7 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, int32_t col
 
             for (int32_t j = 0; j < tscGetNumOfColumns(pTableMetaInfo->pTableMeta); ++j) {
               index.columnIndex = j;
-              if (setExprInfoForFunctions(pCmd, pQueryInfo, pSchema, cvtFunc, pItem->aliasName, colIndex++, &index) != 0) {
+              if (setExprInfoForFunctions(pCmd, pQueryInfo, pSchema, cvtFunc, pItem->aliasName, colIndex++, &index, finalResult) != 0) {
                 return TSDB_CODE_TSC_INVALID_SQL;
               }
             }
@@ -1945,7 +1950,8 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, int32_t col
             if ((index.columnIndex >= tscGetNumOfColumns(pTableMetaInfo->pTableMeta)) || (index.columnIndex < 0)) {
               return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg6);
             }
-            if (setExprInfoForFunctions(pCmd, pQueryInfo, pSchema, cvtFunc, pItem->aliasName, colIndex + i, &index) != 0) {
+
+            if (setExprInfoForFunctions(pCmd, pQueryInfo, pSchema, cvtFunc, pItem->aliasName, colIndex + i, &index, finalResult) != 0) {
               return TSDB_CODE_TSC_INVALID_SQL;
             }
 
@@ -1982,7 +1988,7 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, int32_t col
 
           for (int32_t i = 0; i < tscGetNumOfColumns(pTableMetaInfo->pTableMeta); ++i) {
             SColumnIndex index = {.tableIndex = j, .columnIndex = i};
-            if (setExprInfoForFunctions(pCmd, pQueryInfo, pSchema, cvtFunc, pItem->aliasName, colIndex, &index) != 0) {
+            if (setExprInfoForFunctions(pCmd, pQueryInfo, pSchema, cvtFunc, pItem->aliasName, colIndex, &index, finalResult) != 0) {
               return TSDB_CODE_TSC_INVALID_SQL;
             }
 

src/client/src/tscServer.c

@@ -24,7 +24,6 @@
 #include "tschemautil.h"
 #include "tsclient.h"
 #include "ttimer.h"
-#include "tutil.h"
 #include "tlockfree.h"
 
 SRpcCorEpSet  tscMgmtEpSet;
@@ -198,16 +197,20 @@ void tscProcessActivityTimer(void *handle, void *tmrId) {
     return;
   }
 
-  if (tscShouldFreeHeartBeat(pHB)) {
+  void** p = taosCacheAcquireByKey(tscObjCache, &pHB, sizeof(TSDB_CACHE_PTR_TYPE));
-    tscDebug("%p free HB object and release connection", pHB);
+  if (p == NULL) {
-    pObj->pHb = 0;
+    tscWarn("%p HB object has been released already", pHB);
-    taos_free_result(pHB);
+    return;
-  } else {
+  }
+
+  assert(*pHB->self == pHB);
+
   int32_t code = tscProcessSql(pHB);
+  taosCacheRelease(tscObjCache, (void**) &p, false);
+
   if (code != TSDB_CODE_SUCCESS) {
     tscError("%p failed to sent HB to server, reason:%s", pHB, tstrerror(code));
   }
-  }
 }
 
 int tscSendMsgToServer(SSqlObj *pSql) {
@@ -474,20 +477,29 @@ void tscKillSTableQuery(SSqlObj *pSql) {
 
   pSql->res.code = TSDB_CODE_TSC_QUERY_CANCELLED;
 
-  for (int i = 0; i < pSql->numOfSubs; ++i) {
+  for (int i = 0; i < pSql->subState.numOfSub; ++i) {
     // NOTE: pSub may have been released already here
     SSqlObj *pSub = pSql->pSubs[i];
     if (pSub == NULL) {
       continue;
     }
 
-    pSub->res.code = TSDB_CODE_TSC_QUERY_CANCELLED;
+    void** p = taosCacheAcquireByKey(tscObjCache, &pSub, sizeof(TSDB_CACHE_PTR_TYPE));
-    if (pSub->pRpcCtx != NULL) {
+    if (p == NULL) {
-      rpcCancelRequest(pSub->pRpcCtx);
+      continue;
-      pSub->pRpcCtx = NULL;
     }
 
-    tscQueueAsyncRes(pSub); // async res? not other functions?
+    SSqlObj* pSubObj = (SSqlObj*) (*p);
+    assert(pSubObj->self == (SSqlObj**) p);
+
+    pSubObj->res.code = TSDB_CODE_TSC_QUERY_CANCELLED;
+    if (pSubObj->pRpcCtx != NULL) {
+      rpcCancelRequest(pSubObj->pRpcCtx);
+      pSubObj->pRpcCtx = NULL;
+    }
+
+    tscQueueAsyncRes(pSubObj); // async res? not other functions?
+    taosCacheRelease(tscObjCache, (void**) &p, false);
   }
 
   tscDebug("%p super table query cancelled", pSql);
@@ -1451,7 +1463,7 @@ int tscProcessLocalRetrieveRsp(SSqlObj *pSql) {
 
 int tscProcessRetrieveLocalMergeRsp(SSqlObj *pSql) {
   SSqlRes *pRes = &pSql->res;
-  SSqlCmd *pCmd = &pSql->cmd;
+  SSqlCmd* pCmd = &pSql->cmd;
 
   int32_t code = pRes->code;
   if (pRes->code != TSDB_CODE_SUCCESS) {
@@ -1494,6 +1506,7 @@ int tscBuildConnectMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
 
   SCMConnectMsg *pConnect = (SCMConnectMsg*)pCmd->payload;
 
+  // TODO refactor full_name
   char *db;  // ugly code to move the space
   db = strstr(pObj->db, TS_PATH_DELIMITER);
   db = (db == NULL) ? pObj->db : db + 1;
@@ -1501,6 +1514,9 @@ int tscBuildConnectMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
   tstrncpy(pConnect->clientVersion, version, sizeof(pConnect->clientVersion));
   tstrncpy(pConnect->msgVersion, "", sizeof(pConnect->msgVersion));
 
+  pConnect->pid = htonl(taosGetPId());
+  taosGetCurrentAPPName(pConnect->appName, NULL);
+
   return TSDB_CODE_SUCCESS;
 }
 
@@ -1653,6 +1669,10 @@ int tscBuildHeartBeatMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
   SCMHeartBeatMsg *pHeartbeat = (SCMHeartBeatMsg *)pCmd->payload;
   pHeartbeat->numOfQueries = numOfQueries;
   pHeartbeat->numOfStreams = numOfStreams;
+
+  pHeartbeat->pid = htonl(taosGetPId());
+  taosGetCurrentAPPName(pHeartbeat->appName, NULL);
+
   int msgLen = tscBuildQueryStreamDesc(pHeartbeat, pObj);
 
   pthread_mutex_unlock(&pObj->mutex);

src/client/src/tscSql.c

@@ -20,13 +20,13 @@
 #include "tcache.h"
 #include "tnote.h"
 #include "trpc.h"
-#include "ttimer.h"
 #include "tscLog.h"
 #include "tscSubquery.h"
 #include "tscUtil.h"
 #include "tsclient.h"
 #include "ttokendef.h"
 #include "tutil.h"
+#include "ttimer.h"
 #include "tscProfile.h"
 
 static bool validImpl(const char* str, size_t maxsize) {
@@ -261,9 +261,6 @@ void taos_close(TAOS *taos) {
     return;
   }
 
-  pObj->signature = NULL;
-  taosTmrStopA(&(pObj->pTimer));
-
   SSqlObj* pHb = pObj->pHb;
   if (pHb != NULL && atomic_val_compare_exchange_ptr(&pObj->pHb, pHb, 0) == pHb) {
     if (pHb->pRpcCtx != NULL) {  // wait for rsp from dnode
@@ -463,6 +460,7 @@ TAOS_ROW taos_fetch_row(TAOS_RES *res) {
   SSqlRes *pRes = &pSql->res;
   
   if (pRes->qhandle == 0 ||
+      pRes->code == TSDB_CODE_TSC_QUERY_CANCELLED ||
       pCmd->command == TSDB_SQL_RETRIEVE_EMPTY_RESULT ||
       pCmd->command == TSDB_SQL_INSERT) {
     return NULL;
@@ -526,7 +524,7 @@ int taos_fetch_block(TAOS_RES *res, TAOS_ROW *rows) {
     pRes->numOfClauseTotal = 0;
     pRes->rspType = 0;
 
-    pSql->numOfSubs = 0;
+    pSql->subState.numOfSub = 0;
     taosTFree(pSql->pSubs);
 
     assert(pSql->fp == NULL);

src/client/src/tscStream.c

@@ -274,7 +274,7 @@ static void tscProcessStreamRetrieveResult(void *param, TAOS_RES *res, int numOf
     taosCacheRelease(tscMetaCache, (void**)&(pTableMetaInfo->pTableMeta), false);
     tscFreeSqlResult(pSql);
     taosTFree(pSql->pSubs);
-    pSql->numOfSubs = 0;
+    pSql->subState.numOfSub = 0;
     taosTFree(pTableMetaInfo->vgroupList);
     tscSetNextLaunchTimer(pStream, pSql);
   }

src/client/src/tscSubquery.c

@@ -26,7 +26,6 @@
 #include "tscSubquery.h"
 
 typedef struct SInsertSupporter {
-  SSubqueryState* pState;
   SSqlObj*  pSql;
   int32_t   index;
 } SInsertSupporter;
@@ -174,7 +173,6 @@ SJoinSupporter* tscCreateJoinSupporter(SSqlObj* pSql, SSubqueryState* pState, in
   }
 
   pSupporter->pObj = pSql;
-  pSupporter->pState = pState;
 
   pSupporter->subqueryIndex = index;
   SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, pSql->cmd.clauseIndex);
@@ -250,7 +248,7 @@ static int32_t tscLaunchRealSubqueries(SSqlObj* pSql) {
   SJoinSupporter* pSupporter = NULL;
   
   //If the columns are not involved in the final select clause, the corresponding query will not be issued.
-  for (int32_t i = 0; i < pSql->numOfSubs; ++i) {
+  for (int32_t i = 0; i < pSql->subState.numOfSub; ++i) {
     pSupporter = pSql->pSubs[i]->param;
     if (taosArrayGetSize(pSupporter->exprList) > 0) {
       ++numOfSub;
@@ -260,16 +258,15 @@ static int32_t tscLaunchRealSubqueries(SSqlObj* pSql) {
   assert(numOfSub > 0);
   
   // scan all subquery, if one sub query has only ts, ignore it
-  tscDebug("%p start to launch secondary subqueries, total:%d, only:%d needs to query", pSql, pSql->numOfSubs, numOfSub);
+  tscDebug("%p start to launch secondary subqueries, total:%d, only:%d needs to query", pSql, pSql->subState.numOfSub, numOfSub);
 
   //the subqueries that do not actually launch the secondary query to virtual node is set as completed.
-  SSubqueryState* pState = pSupporter->pState;
+  SSubqueryState* pState = &pSql->subState;
-  pState->numOfTotal = pSql->numOfSubs;
+  pState->numOfRemain = pState->numOfSub;
-  pState->numOfRemain = numOfSub;
 
   bool success = true;
   
-  for (int32_t i = 0; i < pSql->numOfSubs; ++i) {
+  for (int32_t i = 0; i < pSql->subState.numOfSub; ++i) {
     SSqlObj *pPrevSub = pSql->pSubs[i];
     pSql->pSubs[i] = NULL;
     
@@ -322,7 +319,7 @@ static int32_t tscLaunchRealSubqueries(SSqlObj* pSql) {
     memset(&pSupporter->fieldsInfo, 0, sizeof(SFieldInfo));
   
     SQueryInfo *pNewQueryInfo = tscGetQueryInfoDetail(&pNew->cmd, 0);
-    assert(pNew->numOfSubs == 0 && pNew->cmd.numOfClause == 1 && pNewQueryInfo->numOfTables == 1);
+    assert(pNew->subState.numOfSub == 0 && pNew->cmd.numOfClause == 1 && pNewQueryInfo->numOfTables == 1);
   
     tscFieldInfoUpdateOffset(pNewQueryInfo);
   
@@ -373,13 +370,13 @@ static int32_t tscLaunchRealSubqueries(SSqlObj* pSql) {
   if (!success) {
     pSql->res.code = TSDB_CODE_TSC_OUT_OF_MEMORY;
     tscError("%p failed to prepare subqueries objs for secondary phase query, numOfSub:%d, code:%d", pSql,
-        pSql->numOfSubs, pSql->res.code);
+        pSql->subState.numOfSub, pSql->res.code);
     freeJoinSubqueryObj(pSql);
     
     return pSql->res.code;
   }
   
-  for(int32_t i = 0; i < pSql->numOfSubs; ++i) {
+  for(int32_t i = 0; i < pSql->subState.numOfSub; ++i) {
     if (pSql->pSubs[i] == NULL) {
       continue;
     }
@@ -391,17 +388,13 @@ static int32_t tscLaunchRealSubqueries(SSqlObj* pSql) {
 }
 
 void freeJoinSubqueryObj(SSqlObj* pSql) {
-  SSubqueryState* pState = NULL;
+  for (int32_t i = 0; i < pSql->subState.numOfSub; ++i) {
-
-  for (int32_t i = 0; i < pSql->numOfSubs; ++i) {
     SSqlObj* pSub = pSql->pSubs[i];
     if (pSub == NULL) {
       continue;
     }
     
     SJoinSupporter* p = pSub->param;
-    pState = p->pState;
-
     tscDestroyJoinSupporter(p);
 
     if (pSub->res.code == TSDB_CODE_SUCCESS) {
@@ -409,14 +402,13 @@ void freeJoinSubqueryObj(SSqlObj* pSql) {
     }
   }
 
-  taosTFree(pState);
+  pSql->subState.numOfSub = 0;
-  pSql->numOfSubs = 0;
 }
 
 static void quitAllSubquery(SSqlObj* pSqlObj, SJoinSupporter* pSupporter) {
-  assert(pSupporter->pState->numOfRemain > 0);
+  assert(pSqlObj->subState.numOfRemain > 0);
 
-  if (atomic_sub_fetch_32(&pSupporter->pState->numOfRemain, 1) <= 0) {
+  if (atomic_sub_fetch_32(&pSqlObj->subState.numOfRemain, 1) <= 0) {
     tscError("%p all subquery return and query failed, global code:%d", pSqlObj, pSqlObj->res.code);
     freeJoinSubqueryObj(pSqlObj);
   }
@@ -680,7 +672,7 @@ static void tidTagRetrieveCallback(void* param, TAOS_RES* tres, int32_t numOfRow
 
   // no data exists in next vnode, mark the <tid, tags> query completed
   // only when there is no subquery exits any more, proceeds to get the intersect of the <tid, tags> tuple sets.
-  if (atomic_sub_fetch_32(&pSupporter->pState->numOfRemain, 1) > 0) {
+  if (atomic_sub_fetch_32(&pParentSql->subState.numOfRemain, 1) > 0) {
     return;
   }
 
@@ -716,10 +708,10 @@ static void tidTagRetrieveCallback(void* param, TAOS_RES* tres, int32_t numOfRow
     STableMetaInfo* pTableMetaInfo2 = tscGetMetaInfo(pQueryInfo2, 0);
     tscBuildVgroupTableInfo(pParentSql, pTableMetaInfo2, s2);
 
-    pSupporter->pState->numOfTotal = 2;
+    pParentSql->subState.numOfSub = 2;
-    pSupporter->pState->numOfRemain = pSupporter->pState->numOfTotal;
+    pParentSql->subState.numOfRemain = pParentSql->subState.numOfSub;
 
-    for (int32_t m = 0; m < pParentSql->numOfSubs; ++m) {
+    for (int32_t m = 0; m < pParentSql->subState.numOfSub; ++m) {
       SSqlObj* sub = pParentSql->pSubs[m];
       issueTSCompQuery(sub, sub->param, pParentSql);
     }
@@ -818,7 +810,7 @@ static void tsCompRetrieveCallback(void* param, TAOS_RES* tres, int32_t numOfRow
     return;
   }
 
-  if (atomic_sub_fetch_32(&pSupporter->pState->numOfRemain, 1) > 0) {
+  if (atomic_sub_fetch_32(&pParentSql->subState.numOfRemain, 1) > 0) {
     return;
   }
 
@@ -850,7 +842,6 @@ static void joinRetrieveFinalResCallback(void* param, TAOS_RES* tres, int numOfR
   SJoinSupporter* pSupporter = (SJoinSupporter*)param;
 
   SSqlObj* pParentSql = pSupporter->pObj;
-  SSubqueryState* pState = pSupporter->pState;
 
   SSqlObj* pSql = (SSqlObj*)tres;
   SSqlCmd* pCmd = &pSql->cmd;
@@ -871,6 +862,7 @@ static void joinRetrieveFinalResCallback(void* param, TAOS_RES* tres, int numOfR
     pRes->numOfTotal += pRes->numOfRows;
   }
 
+  SSubqueryState* pState = &pParentSql->subState;
   if (tscNonOrderedProjectionQueryOnSTable(pQueryInfo, 0) && numOfRows == 0) {
     STableMetaInfo* pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
     assert(pQueryInfo->numOfTables == 1);
@@ -878,7 +870,7 @@ static void joinRetrieveFinalResCallback(void* param, TAOS_RES* tres, int numOfR
     // for projection query, need to try next vnode if current vnode is exhausted
     if ((++pTableMetaInfo->vgroupIndex) < pTableMetaInfo->vgroupList->numOfVgroups) {
       pState->numOfRemain = 1;
-      pState->numOfTotal = 1;
+      pState->numOfSub = 1;
 
       pSql->cmd.command = TSDB_SQL_SELECT;
       pSql->fp = tscJoinQueryCallback;
@@ -888,12 +880,12 @@ static void joinRetrieveFinalResCallback(void* param, TAOS_RES* tres, int numOfR
     }
   }
 
-  if (atomic_sub_fetch_32(&pState->numOfRemain, 1) > 0) {
+  if (atomic_sub_fetch_32(&pParentSql->subState.numOfRemain, 1) > 0) {
-    tscDebug("%p sub:%p completed, remain:%d, total:%d", pParentSql, tres, pState->numOfRemain, pState->numOfTotal);
+    tscDebug("%p sub:%p completed, remain:%d, total:%d", pParentSql, tres, pParentSql->subState.numOfRemain, pState->numOfSub);
     return;
   }
 
-  tscDebug("%p all %d secondary subqueries retrieval completed, code:%d", tres, pState->numOfTotal, pParentSql->res.code);
+  tscDebug("%p all %d secondary subqueries retrieval completed, code:%d", tres, pState->numOfSub, pParentSql->res.code);
 
   if (pParentSql->res.code != TSDB_CODE_SUCCESS) {
     freeJoinSubqueryObj(pParentSql);
@@ -901,7 +893,7 @@ static void joinRetrieveFinalResCallback(void* param, TAOS_RES* tres, int numOfR
   }
 
   // update the records for each subquery in parent sql object.
-  for (int32_t i = 0; i < pParentSql->numOfSubs; ++i) {
+  for (int32_t i = 0; i < pState->numOfSub; ++i) {
     if (pParentSql->pSubs[i] == NULL) {
       continue;
     }
@@ -917,32 +909,26 @@ static void joinRetrieveFinalResCallback(void* param, TAOS_RES* tres, int numOfR
 static SJoinSupporter* tscUpdateSubqueryStatus(SSqlObj* pSql, int32_t numOfFetch) {
   int32_t notInvolved = 0;
   SJoinSupporter* pSupporter = NULL;
-  SSubqueryState* pState = NULL;
+  SSubqueryState* pState = &pSql->subState;
   
-  for(int32_t i = 0; i < pSql->numOfSubs; ++i) {
+  for(int32_t i = 0; i < pSql->subState.numOfSub; ++i) {
     if (pSql->pSubs[i] == NULL) {
       notInvolved++;
     } else {
       pSupporter = (SJoinSupporter*)pSql->pSubs[i]->param;
-      pState = pSupporter->pState;
     }
   }
   
-  assert(pState != NULL);
-  if (pState != NULL) {
-    pState->numOfTotal = pSql->numOfSubs;
   pState->numOfRemain = numOfFetch;
-  }
-  
   return pSupporter;
 }
 
 void tscFetchDatablockFromSubquery(SSqlObj* pSql) {
-  assert(pSql->numOfSubs >= 1);
+  assert(pSql->subState.numOfSub >= 1);
   
   int32_t numOfFetch = 0;
   bool hasData = true;
-  for (int32_t i = 0; i < pSql->numOfSubs; ++i) {
+  for (int32_t i = 0; i < pSql->subState.numOfSub; ++i) {
     // if the subquery is NULL, it does not involved in the final result generation
     SSqlObj* pSub = pSql->pSubs[i];
     if (pSub == NULL) {
@@ -989,7 +975,7 @@ void tscFetchDatablockFromSubquery(SSqlObj* pSql) {
   tscDebug("%p retrieve data from %d subqueries", pSql, numOfFetch);
   SJoinSupporter* pSupporter = tscUpdateSubqueryStatus(pSql, numOfFetch);
   
-  for (int32_t i = 0; i < pSql->numOfSubs; ++i) {
+  for (int32_t i = 0; i < pSql->subState.numOfSub; ++i) {
     SSqlObj* pSql1 = pSql->pSubs[i];
     if (pSql1 == NULL) {
       continue;
@@ -1124,7 +1110,7 @@ void tscJoinQueryCallback(void* param, TAOS_RES* tres, int code) {
   }
 
   // wait for the other subqueries response from vnode
-  if (atomic_sub_fetch_32(&pSupporter->pState->numOfRemain, 1) > 0) {
+  if (atomic_sub_fetch_32(&pParentSql->subState.numOfRemain, 1) > 0) {
     return;
   }
 
@@ -1136,7 +1122,7 @@ void tscJoinQueryCallback(void* param, TAOS_RES* tres, int code) {
    * data instead of returning to its invoker
    */
   if (pTableMetaInfo->vgroupIndex > 0 && tscNonOrderedProjectionQueryOnSTable(pQueryInfo, 0)) {
-    pSupporter->pState->numOfRemain = pSupporter->pState->numOfTotal;  // reset the record value
+    pParentSql->subState.numOfRemain = pParentSql->subState.numOfSub;  // reset the record value
 
     pSql->fp = joinRetrieveFinalResCallback;  // continue retrieve data
     pSql->cmd.command = TSDB_SQL_FETCH;
@@ -1165,7 +1151,7 @@ int32_t tscCreateJoinSubquery(SSqlObj *pSql, int16_t tableIndex, SJoinSupporter
   assert(pSql->res.numOfRows == 0);
 
   if (pSql->pSubs == NULL) {
-    pSql->pSubs = calloc(pSupporter->pState->numOfTotal, POINTER_BYTES);
+    pSql->pSubs = calloc(pSql->subState.numOfSub, POINTER_BYTES);
     if (pSql->pSubs == NULL) {
       return TSDB_CODE_TSC_OUT_OF_MEMORY;
     }
@@ -1176,8 +1162,8 @@ int32_t tscCreateJoinSubquery(SSqlObj *pSql, int16_t tableIndex, SJoinSupporter
     return TSDB_CODE_TSC_OUT_OF_MEMORY;
   }
   
-  pSql->pSubs[pSql->numOfSubs++] = pNew;
+  pSql->pSubs[pSql->subState.numOfRemain++] = pNew;
-  assert(pSql->numOfSubs <= pSupporter->pState->numOfTotal);
+  assert(pSql->subState.numOfRemain <= pSql->subState.numOfSub);
   
   if (QUERY_IS_JOIN_QUERY(pQueryInfo->type)) {
     addGroupInfoForSubquery(pSql, pNew, 0, tableIndex);
@@ -1221,7 +1207,7 @@ int32_t tscCreateJoinSubquery(SSqlObj *pSql, int16_t tableIndex, SJoinSupporter
     STableMetaInfo *pTableMetaInfo = tscGetMetaInfo(pNewQueryInfo, 0);
     
     if (UTIL_TABLE_IS_SUPER_TABLE(pTableMetaInfo)) { // return the tableId & tag
-      SColumnIndex index = {0};
+      SColumnIndex colIndex = {0};
 
       STagCond* pTagCond = &pSupporter->tagCond;
       assert(pTagCond->joinInfo.hasJoin);
@@ -1234,7 +1220,7 @@ int32_t tscCreateJoinSubquery(SSqlObj *pSql, int16_t tableIndex, SJoinSupporter
       SSchema* pSchema = tscGetTableTagSchema(pTableMetaInfo->pTableMeta);
       for(int32_t i = 0; i < numOfTags; ++i) {
         if (pSchema[i].colId == tagColId) {
-          index.columnIndex = i;
+          colIndex.columnIndex = i;
           break;
         }
       }
@@ -1251,18 +1237,18 @@ int32_t tscCreateJoinSubquery(SSqlObj *pSql, int16_t tableIndex, SJoinSupporter
 
       // set get tags query type
       TSDB_QUERY_SET_TYPE(pNewQueryInfo->type, TSDB_QUERY_TYPE_TAG_FILTER_QUERY);
-      tscAddSpecialColumnForSelect(pNewQueryInfo, 0, TSDB_FUNC_TID_TAG, &index, &s1, TSDB_COL_TAG);
+      tscAddSpecialColumnForSelect(pNewQueryInfo, 0, TSDB_FUNC_TID_TAG, &colIndex, &s1, TSDB_COL_TAG);
       size_t numOfCols = taosArrayGetSize(pNewQueryInfo->colList);
   
       tscDebug(
           "%p subquery:%p tableIndex:%d, vgroupIndex:%d, type:%d, transfer to tid_tag query to retrieve (tableId, tags), "
           "exprInfo:%" PRIzu ", colList:%" PRIzu ", fieldsInfo:%d, tagIndex:%d, name:%s",
           pSql, pNew, tableIndex, pTableMetaInfo->vgroupIndex, pNewQueryInfo->type, tscSqlExprNumOfExprs(pNewQueryInfo),
-          numOfCols, pNewQueryInfo->fieldsInfo.numOfOutput, index.columnIndex, pNewQueryInfo->pTableMetaInfo[0]->name);
+          numOfCols, pNewQueryInfo->fieldsInfo.numOfOutput, colIndex.columnIndex, pNewQueryInfo->pTableMetaInfo[0]->name);
     } else {
       SSchema      colSchema = {.type = TSDB_DATA_TYPE_BINARY, .bytes = 1};
-      SColumnIndex index = {0, PRIMARYKEY_TIMESTAMP_COL_INDEX};
+      SColumnIndex colIndex = {0, PRIMARYKEY_TIMESTAMP_COL_INDEX};
-      tscAddSpecialColumnForSelect(pNewQueryInfo, 0, TSDB_FUNC_TS_COMP, &index, &colSchema, TSDB_COL_NORMAL);
+      tscAddSpecialColumnForSelect(pNewQueryInfo, 0, TSDB_FUNC_TS_COMP, &colIndex, &colSchema, TSDB_COL_NORMAL);
 
       // set the tags value for ts_comp function
       SSqlExpr *pExpr = tscSqlExprGet(pNewQueryInfo, 0);
@@ -1320,8 +1306,7 @@ void tscHandleMasterJoinQuery(SSqlObj* pSql) {
     goto _error;
   }
 
-  pState->numOfTotal = pQueryInfo->numOfTables;
+  pSql->subState.numOfSub = pQueryInfo->numOfTables;
-  pState->numOfRemain = pState->numOfTotal;
 
   bool hasEmptySub = false;
 
@@ -1354,10 +1339,10 @@ void tscHandleMasterJoinQuery(SSqlObj* pSql) {
     pSql->cmd.command = TSDB_SQL_RETRIEVE_EMPTY_RESULT;
     (*pSql->fp)(pSql->param, pSql, 0);
   } else {
-    for (int32_t i = 0; i < pSql->numOfSubs; ++i) {
+    for (int32_t i = 0; i < pSql->subState.numOfSub; ++i) {
       SSqlObj* pSub = pSql->pSubs[i];
       if ((code = tscProcessSql(pSub)) != TSDB_CODE_SUCCESS) {
-        pState->numOfRemain = i - 1;  // the already sent reques will continue and do not go to the error process routine
+        pSql->subState.numOfRemain = i - 1;  // the already sent request will continue and do not go to the error process routine
         break;
       }
     }
@@ -1373,7 +1358,7 @@ void tscHandleMasterJoinQuery(SSqlObj* pSql) {
 }
 
 static void doCleanupSubqueries(SSqlObj *pSql, int32_t numOfSubs, SSubqueryState* pState) {
-  assert(numOfSubs <= pSql->numOfSubs && numOfSubs >= 0 && pState != NULL);
+  assert(numOfSubs <= pSql->subState.numOfSub && numOfSubs >= 0 && pState != NULL);
   
   for(int32_t i = 0; i < numOfSubs; ++i) {
     SSqlObj* pSub = pSql->pSubs[i];
@@ -1411,8 +1396,8 @@ int32_t tscHandleMasterSTableQuery(SSqlObj *pSql) {
   SQueryInfo     *pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);
   STableMetaInfo *pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
   
-  pSql->numOfSubs = pTableMetaInfo->vgroupList->numOfVgroups;
+  pSql->subState.numOfSub = pTableMetaInfo->vgroupList->numOfVgroups;
-  assert(pSql->numOfSubs > 0);
+  assert(pSql->subState.numOfSub > 0);
   
   int32_t ret = tscLocalReducerEnvCreate(pSql, &pMemoryBuf, &pDesc, &pModel, nBufferSize);
   if (ret != 0) {
@@ -1422,28 +1407,26 @@ int32_t tscHandleMasterSTableQuery(SSqlObj *pSql) {
     return ret;
   }
   
-  pSql->pSubs = calloc(pSql->numOfSubs, POINTER_BYTES);
+  pSql->pSubs = calloc(pSql->subState.numOfSub, POINTER_BYTES);
 
-  tscDebug("%p retrieved query data from %d vnode(s)", pSql, pSql->numOfSubs);
+  tscDebug("%p retrieved query data from %d vnode(s)", pSql, pSql->subState.numOfSub);
   SSubqueryState *pState = calloc(1, sizeof(SSubqueryState));
 
   if (pSql->pSubs == NULL || pState == NULL) {
     taosTFree(pState);
     taosTFree(pSql->pSubs);
     pRes->code = TSDB_CODE_TSC_OUT_OF_MEMORY;
-    tscLocalReducerEnvDestroy(pMemoryBuf, pDesc, pModel, pSql->numOfSubs);
+    tscLocalReducerEnvDestroy(pMemoryBuf, pDesc, pModel, pSql->subState.numOfSub);
 
     tscQueueAsyncRes(pSql);
     return ret;
   }
 
-  pState->numOfTotal = pSql->numOfSubs;
+  pSql->subState.numOfRemain = pSql->subState.numOfSub;
-  pState->numOfRemain = pSql->numOfSubs;
-
   pRes->code = TSDB_CODE_SUCCESS;
   
   int32_t i = 0;
-  for (; i < pSql->numOfSubs; ++i) {
+  for (; i < pSql->subState.numOfSub; ++i) {
     SRetrieveSupport *trs = (SRetrieveSupport *)calloc(1, sizeof(SRetrieveSupport));
     if (trs == NULL) {
       tscError("%p failed to malloc buffer for SRetrieveSupport, orderOfSub:%d, reason:%s", pSql, i, strerror(errno));
@@ -1452,7 +1435,6 @@ int32_t tscHandleMasterSTableQuery(SSqlObj *pSql) {
     
     trs->pExtMemBuffer = pMemoryBuf;
     trs->pOrderDescriptor = pDesc;
-    trs->pState = pState;
 
     trs->localBuffer = (tFilePage *)calloc(1, nBufferSize + sizeof(tFilePage));
     if (trs->localBuffer == NULL) {
@@ -1483,22 +1465,22 @@ int32_t tscHandleMasterSTableQuery(SSqlObj *pSql) {
     tscDebug("%p sub:%p create subquery success. orderOfSub:%d", pSql, pNew, trs->subqueryIndex);
   }
   
-  if (i < pSql->numOfSubs) {
+  if (i < pSql->subState.numOfSub) {
     tscError("%p failed to prepare subquery structure and launch subqueries", pSql);
     pRes->code = TSDB_CODE_TSC_OUT_OF_MEMORY;
     
-    tscLocalReducerEnvDestroy(pMemoryBuf, pDesc, pModel, pSql->numOfSubs);
+    tscLocalReducerEnvDestroy(pMemoryBuf, pDesc, pModel, pSql->subState.numOfSub);
     doCleanupSubqueries(pSql, i, pState);
     return pRes->code;   // free all allocated resource
   }
   
   if (pRes->code == TSDB_CODE_TSC_QUERY_CANCELLED) {
-    tscLocalReducerEnvDestroy(pMemoryBuf, pDesc, pModel, pSql->numOfSubs);
+    tscLocalReducerEnvDestroy(pMemoryBuf, pDesc, pModel, pSql->subState.numOfSub);
     doCleanupSubqueries(pSql, i, pState);
     return pRes->code;
   }
   
-  for(int32_t j = 0; j < pSql->numOfSubs; ++j) {
+  for(int32_t j = 0; j < pSql->subState.numOfSub; ++j) {
     SSqlObj* pSub = pSql->pSubs[j];
     SRetrieveSupport* pSupport = pSub->param;
     
@@ -1512,13 +1494,10 @@ int32_t tscHandleMasterSTableQuery(SSqlObj *pSql) {
 static void tscFreeSubSqlObj(SRetrieveSupport *trsupport, SSqlObj *pSql) {
   tscDebug("%p start to free subquery obj", pSql);
 
-  int32_t  index = trsupport->subqueryIndex;
+//  int32_t  index = trsupport->subqueryIndex;
-  SSqlObj *pParentSql = trsupport->pParentSql;
+//  SSqlObj *pParentSql = trsupport->pParentSql;
 
-  assert(pSql == pParentSql->pSubs[index]);
+//  assert(pSql == pParentSql->pSubs[index]);
-//  pParentSql->pSubs[index] = NULL;
-//
-//  taos_free_result(pSql);
   taosTFree(trsupport->localBuffer);
   taosTFree(trsupport);
 }
@@ -1581,8 +1560,13 @@ void tscHandleSubqueryError(SRetrieveSupport *trsupport, SSqlObj *pSql, int numO
   int32_t  subqueryIndex = trsupport->subqueryIndex;
   
   assert(pSql != NULL);
-  SSubqueryState* pState = trsupport->pState;
+  SSubqueryState* pState = &pParentSql->subState;
-  assert(pState->numOfRemain <= pState->numOfTotal && pState->numOfRemain >= 0 && pParentSql->numOfSubs == pState->numOfTotal);
+  int32_t remain = pState->numOfRemain;
+  int32_t sub = pState->numOfSub;
+  UNUSED(remain);
+  UNUSED(sub);
+
+  assert(pParentSql->subState.numOfRemain <= pState->numOfSub && pParentSql->subState.numOfRemain >= 0);
 
   // retrieved in subquery failed. OR query cancelled in retrieve phase.
   if (taos_errno(pSql) == TSDB_CODE_SUCCESS && pParentSql->res.code != TSDB_CODE_SUCCESS) {
@@ -1613,24 +1597,23 @@ void tscHandleSubqueryError(SRetrieveSupport *trsupport, SSqlObj *pSql, int numO
     }
   }
 
-  int32_t remain = -1;
+  remain = -1;
-  if ((remain = atomic_sub_fetch_32(&pState->numOfRemain, 1)) > 0) {
+  if ((remain = atomic_sub_fetch_32(&pParentSql->subState.numOfRemain, 1)) > 0) {
     tscDebug("%p sub:%p orderOfSub:%d freed, finished subqueries:%d", pParentSql, pSql, trsupport->subqueryIndex,
-        pState->numOfTotal - remain);
+        pState->numOfSub - remain);
 
     tscFreeSubSqlObj(trsupport, pSql);
     return;
   }
   
   // all subqueries are failed
-  tscError("%p retrieve from %d vnode(s) completed,code:%s.FAILED.", pParentSql, pState->numOfTotal,
+  tscError("%p retrieve from %d vnode(s) completed,code:%s.FAILED.", pParentSql, pState->numOfSub,
       tstrerror(pParentSql->res.code));
 
   // release allocated resource
   tscLocalReducerEnvDestroy(trsupport->pExtMemBuffer, trsupport->pOrderDescriptor, trsupport->pFinalColModel,
-                            pState->numOfTotal);
+                            pState->numOfSub);
   
-  taosTFree(trsupport->pState);
   tscFreeSubSqlObj(trsupport, pSql);
 
   // in case of second stage join subquery, invoke its callback function instead of regular QueueAsyncRes
@@ -1650,7 +1633,7 @@ static void tscAllDataRetrievedFromDnode(SRetrieveSupport *trsupport, SSqlObj* p
   SSqlObj *         pParentSql = trsupport->pParentSql;
   tOrderDescriptor *pDesc = trsupport->pOrderDescriptor;
   
-  SSubqueryState* pState = trsupport->pState;
+  SSubqueryState* pState = &pParentSql->subState;
   SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
   
   STableMetaInfo* pTableMetaInfo = pQueryInfo->pTableMetaInfo[0];
@@ -1687,9 +1670,9 @@ static void tscAllDataRetrievedFromDnode(SRetrieveSupport *trsupport, SSqlObj* p
   }
   
   int32_t remain = -1;
-  if ((remain = atomic_sub_fetch_32(&pState->numOfRemain, 1)) > 0) {
+  if ((remain = atomic_sub_fetch_32(&pParentSql->subState.numOfRemain, 1)) > 0) {
     tscDebug("%p sub:%p orderOfSub:%d freed, finished subqueries:%d", pParentSql, pSql, trsupport->subqueryIndex,
-        pState->numOfTotal - remain);
+        pState->numOfSub - remain);
 
     tscFreeSubSqlObj(trsupport, pSql);
     return;
@@ -1699,20 +1682,18 @@ static void tscAllDataRetrievedFromDnode(SRetrieveSupport *trsupport, SSqlObj* p
   pDesc->pColumnModel->capacity = trsupport->pExtMemBuffer[idx]->numOfElemsPerPage;
   
   tscDebug("%p retrieve from %d vnodes completed.final NumOfRows:%" PRId64 ",start to build loser tree", pParentSql,
-           pState->numOfTotal, pState->numOfRetrievedRows);
+           pState->numOfSub, pState->numOfRetrievedRows);
   
   SQueryInfo *pPQueryInfo = tscGetQueryInfoDetail(&pParentSql->cmd, 0);
   tscClearInterpInfo(pPQueryInfo);
   
-  tscCreateLocalReducer(trsupport->pExtMemBuffer, pState->numOfTotal, pDesc, trsupport->pFinalColModel, pParentSql);
+  tscCreateLocalReducer(trsupport->pExtMemBuffer, pState->numOfSub, pDesc, trsupport->pFinalColModel, pParentSql);
   tscDebug("%p build loser tree completed", pParentSql);
   
   pParentSql->res.precision = pSql->res.precision;
   pParentSql->res.numOfRows = 0;
   pParentSql->res.row = 0;
   
-  // only free once
-  taosTFree(trsupport->pState);
   tscFreeSubSqlObj(trsupport, pSql);
 
   // set the command flag must be after the semaphore been correctly set.
@@ -1733,8 +1714,8 @@ static void tscRetrieveFromDnodeCallBack(void *param, TAOS_RES *tres, int numOfR
   assert(tres != NULL);
   SSqlObj *pSql = (SSqlObj *)tres;
 
-  SSubqueryState* pState = trsupport->pState;
+  SSubqueryState* pState = &pParentSql->subState;
-  assert(pState->numOfRemain <= pState->numOfTotal && pState->numOfRemain >= 0 && pParentSql->numOfSubs == pState->numOfTotal);
+  assert(pState->numOfRemain <= pState->numOfSub && pState->numOfRemain >= 0);
   
   STableMetaInfo *pTableMetaInfo = tscGetTableMetaInfoFromCmd(&pSql->cmd, 0, 0);
   SCMVgroupInfo  *pVgroup = &pTableMetaInfo->vgroupList->vgroups[0];
@@ -1751,6 +1732,10 @@ static void tscRetrieveFromDnodeCallBack(void *param, TAOS_RES *tres, int numOfR
   if (taos_errno(pSql) != TSDB_CODE_SUCCESS) {
     assert(numOfRows == taos_errno(pSql));
 
+    if (numOfRows == TSDB_CODE_TSC_QUERY_CANCELLED) {
+      trsupport->numOfRetry = MAX_NUM_OF_SUBQUERY_RETRY;
+    }
+
     if (trsupport->numOfRetry++ < MAX_NUM_OF_SUBQUERY_RETRY) {
       tscError("%p sub:%p failed code:%s, retry:%d", pParentSql, pSql, tstrerror(numOfRows), trsupport->numOfRetry);
 
@@ -1822,7 +1807,7 @@ static SSqlObj *tscCreateSTableSubquery(SSqlObj *pSql, SRetrieveSupport *trsuppo
     SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(&pNew->cmd, 0);
 
     pQueryInfo->type |= TSDB_QUERY_TYPE_STABLE_SUBQUERY;
-    assert(pQueryInfo->numOfTables == 1 && pNew->cmd.numOfClause == 1 && trsupport->subqueryIndex < pSql->numOfSubs);
+    assert(pQueryInfo->numOfTables == 1 && pNew->cmd.numOfClause == 1 && trsupport->subqueryIndex < pSql->subState.numOfSub);
     
     // launch subquery for each vnode, so the subquery index equals to the vgroupIndex.
     STableMetaInfo *pTableMetaInfo = tscGetMetaInfo(pQueryInfo, table_index);
@@ -1893,7 +1878,6 @@ void tscRetrieveDataRes(void *param, TAOS_RES *tres, int code) {
 static void multiVnodeInsertFinalize(void* param, TAOS_RES* tres, int numOfRows) {
   SInsertSupporter *pSupporter = (SInsertSupporter *)param;
   SSqlObj* pParentObj = pSupporter->pSql;
-  SSubqueryState* pState = pSupporter->pState;
 
   // record the total inserted rows
   if (numOfRows > 0) {
@@ -1908,15 +1892,13 @@ static void multiVnodeInsertFinalize(void* param, TAOS_RES* tres, int numOfRows)
   }
 
   taosTFree(pSupporter);
-  if (atomic_sub_fetch_32(&pState->numOfRemain, 1) > 0) {
+
+  if (atomic_sub_fetch_32(&pParentObj->subState.numOfRemain, 1) > 0) {
     return;
   }
   
   tscDebug("%p Async insertion completed, total inserted:%" PRId64, pParentObj, pParentObj->res.numOfRows);
 
-  // release data block data
-  taosTFree(pState);
-
   // restore user defined fp
   pParentObj->fp = pParentObj->fetchFp;
 
@@ -1937,7 +1919,7 @@ int32_t tscHandleInsertRetry(SSqlObj* pSql) {
   SSqlRes* pRes = &pSql->res;
 
   SInsertSupporter* pSupporter = (SInsertSupporter*) pSql->param;
-  assert(pSupporter->index < pSupporter->pState->numOfTotal);
+  assert(pSupporter->index < pSupporter->pSql->subState.numOfSub);
 
   STableDataBlocks* pTableDataBlock = taosArrayGetP(pCmd->pDataBlocks, pSupporter->index);
   int32_t code = tscCopyDataBlockToPayload(pSql, pTableDataBlock);
@@ -1954,33 +1936,29 @@ int32_t tscHandleMultivnodeInsert(SSqlObj *pSql) {
   SSqlCmd *pCmd = &pSql->cmd;
   SSqlRes *pRes = &pSql->res;
 
-  pSql->numOfSubs = (uint16_t)taosArrayGetSize(pCmd->pDataBlocks);
+  pSql->subState.numOfSub = (uint16_t)taosArrayGetSize(pCmd->pDataBlocks);
-  assert(pSql->numOfSubs > 0);
+  assert(pSql->subState.numOfSub > 0);
 
   pRes->code = TSDB_CODE_SUCCESS;
 
   // the number of already initialized subqueries
   int32_t numOfSub = 0;
 
-  SSubqueryState *pState = calloc(1, sizeof(SSubqueryState));
+  pSql->subState.numOfRemain = pSql->subState.numOfSub;
-  pState->numOfTotal = pSql->numOfSubs;
+  pSql->pSubs = calloc(pSql->subState.numOfSub, POINTER_BYTES);
-  pState->numOfRemain = pSql->numOfSubs;
-
-  pSql->pSubs = calloc(pSql->numOfSubs, POINTER_BYTES);
   if (pSql->pSubs == NULL) {
     goto _error;
   }
 
-  tscDebug("%p submit data to %d vnode(s)", pSql, pSql->numOfSubs);
+  tscDebug("%p submit data to %d vnode(s)", pSql, pSql->subState.numOfSub);
 
-  while(numOfSub < pSql->numOfSubs) {
+  while(numOfSub < pSql->subState.numOfSub) {
     SInsertSupporter* pSupporter = calloc(1, sizeof(SInsertSupporter));
     if (pSupporter == NULL) {
       goto _error;
     }
 
     pSupporter->pSql   = pSql;
-    pSupporter->pState = pState;
     pSupporter->index  = numOfSub;
 
     SSqlObj *pNew = createSimpleSubObj(pSql, multiVnodeInsertFinalize, pSupporter, TSDB_SQL_INSERT);
@@ -2003,12 +1981,12 @@ int32_t tscHandleMultivnodeInsert(SSqlObj *pSql) {
       numOfSub++;
     } else {
       tscDebug("%p prepare submit data block failed in async insertion, vnodeIdx:%d, total:%d, code:%s", pSql, numOfSub,
-               pSql->numOfSubs, tstrerror(pRes->code));
+               pSql->subState.numOfSub, tstrerror(pRes->code));
       goto _error;
     }
   }
   
-  if (numOfSub < pSql->numOfSubs) {
+  if (numOfSub < pSql->subState.numOfSub) {
     tscError("%p failed to prepare subObj structure and launch sub-insertion", pSql);
     pRes->code = TSDB_CODE_TSC_OUT_OF_MEMORY;
     goto _error;
@@ -2026,7 +2004,6 @@ int32_t tscHandleMultivnodeInsert(SSqlObj *pSql) {
   return TSDB_CODE_SUCCESS;
 
   _error:
-  taosTFree(pState);
   return TSDB_CODE_TSC_OUT_OF_MEMORY;
 }
 
@@ -2048,7 +2025,7 @@ static void doBuildResFromSubqueries(SSqlObj* pSql) {
   SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, pSql->cmd.clauseIndex);
 
   int32_t numOfRes = INT32_MAX;
-  for (int32_t i = 0; i < pSql->numOfSubs; ++i) {
+  for (int32_t i = 0; i < pSql->subState.numOfSub; ++i) {
     if (pSql->pSubs[i] == NULL) {
       continue;
     }
@@ -2238,7 +2215,7 @@ static UNUSED_FUNC bool tscHasRemainDataInSubqueryResultSet(SSqlObj *pSql) {
   if (tscNonOrderedProjectionQueryOnSTable(pQueryInfo, 0)) {
     bool allSubqueryExhausted = true;
     
-    for (int32_t i = 0; i < pSql->numOfSubs; ++i) {
+    for (int32_t i = 0; i < pSql->subState.numOfSub; ++i) {
       if (pSql->pSubs[i] == NULL) {
         continue;
       }
@@ -2264,7 +2241,7 @@ static UNUSED_FUNC bool tscHasRemainDataInSubqueryResultSet(SSqlObj *pSql) {
     
     hasData = !allSubqueryExhausted;
   } else {  // otherwise, in case inner join, if any subquery exhausted, query completed.
-    for (int32_t i = 0; i < pSql->numOfSubs; ++i) {
+    for (int32_t i = 0; i < pSql->subState.numOfSub; ++i) {
       if (pSql->pSubs[i] == 0) {
         continue;
       }

src/client/src/tscUtil.c

@@ -360,26 +360,26 @@ void tscPartiallyFreeSqlObj(SSqlObj* pSql) {
   tscFreeSqlResult(pSql);
   
   taosTFree(pSql->pSubs);
-  pSql->numOfSubs = 0;
+  pSql->subState.numOfSub = 0;
   pSql->self = 0;
   
   tscResetSqlCmdObj(pCmd, false);
 }
 
-static UNUSED_FUNC void tscFreeSubobj(SSqlObj* pSql) {
+static void tscFreeSubobj(SSqlObj* pSql) {
-  if (pSql->numOfSubs == 0) {
+  if (pSql->subState.numOfSub == 0) {
     return;
   }
 
-  tscDebug("%p start to free sub SqlObj, numOfSub:%d", pSql, pSql->numOfSubs);
+  tscDebug("%p start to free sub SqlObj, numOfSub:%d", pSql, pSql->subState.numOfSub);
 
-  for(int32_t i = 0; i < pSql->numOfSubs; ++i) {
+  for(int32_t i = 0; i < pSql->subState.numOfSub; ++i) {
     tscDebug("%p free sub SqlObj:%p, index:%d", pSql, pSql->pSubs[i], i);
     taos_free_result(pSql->pSubs[i]);
     pSql->pSubs[i] = NULL;
   }
 
-  pSql->numOfSubs = 0;
+  pSql->subState.numOfSub = 0;
 }
 
 /**
@@ -415,7 +415,9 @@ void tscFreeSqlObj(SSqlObj* pSql) {
 
   tscDebug("%p start to free sqlObj", pSql);
 
+  pSql->res.code = TSDB_CODE_TSC_QUERY_CANCELLED;
   tscFreeSubobj(pSql);
+
   tscPartiallyFreeSqlObj(pSql);
 
   pSql->signature = NULL;
@@ -1516,13 +1518,6 @@ void tscSetFreeHeatBeat(STscObj* pObj) {
   pQueryInfo->type = TSDB_QUERY_TYPE_FREE_RESOURCE;
 }
 
-bool tscShouldFreeHeartBeat(SSqlObj* pHb) {
-  assert(pHb == pHb->signature);
-
-  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pHb->cmd, 0);
-  return pQueryInfo->type == TSDB_QUERY_TYPE_FREE_RESOURCE;
-}
-
 /*
  * the following four kinds of SqlObj should not be freed
  * 1. SqlObj for stream computing
@@ -2291,7 +2286,7 @@ void tscTryQueryNextVnode(SSqlObj* pSql, __async_cb_func_t fp) {
      *
      * For super table join with projection query, if anyone of the subquery is exhausted, the query completed.
      */
-    pSql->numOfSubs = 0;
+    pSql->subState.numOfSub = 0;
     pCmd->command = TSDB_SQL_SELECT;
 
     tscResetForNextRetrieve(pRes);
@@ -2323,7 +2318,7 @@ void tscTryQueryNextClause(SSqlObj* pSql, __async_cb_func_t fp) {
   pRes->numOfTotal = num;
   
   taosTFree(pSql->pSubs);
-  pSql->numOfSubs = 0;
+  pSql->subState.numOfSub = 0;
   pSql->fp = fp;
 
   tscDebug("%p try data in the next subclause:%d, total subclause:%d", pSql, pCmd->clauseIndex, pCmd->numOfClause);

src/connector/go

@@ -1 +1 @@
-Subproject commit 8d7bf743852897110cbdcc7c4322cd7a74d4167b
+Subproject commit 8c58c512b6acda8bcdfa48fdc7140227b5221766

src/inc/taosdef.h

@@ -253,8 +253,10 @@ void tsDataSwap(void *pLeft, void *pRight, int32_t type, int32_t size, void* buf
 #define TSDB_COL_NAME_LEN         65
 #define TSDB_MAX_SAVED_SQL_LEN    TSDB_MAX_COLUMNS * 64
 #define TSDB_MAX_SQL_LEN          TSDB_PAYLOAD_SIZE
-#define TSDB_MAX_SQL_SHOW_LEN     256
+#define TSDB_MAX_SQL_SHOW_LEN     512
-#define TSDB_MAX_ALLOWED_SQL_LEN  (1*1024*1024U)          // sql length should be less than 8mb
+#define TSDB_MAX_ALLOWED_SQL_LEN  (8*1024*1024U)          // sql length should be less than 8mb
+
+#define TSDB_APPNAME_LEN          TSDB_UNI_LEN
 
 #define TSDB_MAX_BYTES_PER_ROW    16384
 #define TSDB_MAX_TAGS_LEN         16384
@@ -282,7 +284,7 @@ void tsDataSwap(void *pLeft, void *pRight, int32_t type, int32_t size, void* buf
 #define TSDB_SHELL_VNODE_BITS     24
 #define TSDB_SHELL_SID_MASK       0xFF
 #define TSDB_HTTP_TOKEN_LEN       20
-#define TSDB_SHOW_SQL_LEN         64
+#define TSDB_SHOW_SQL_LEN         512
 #define TSDB_SLOW_QUERY_SQL_LEN   512
 
 #define TSDB_MQTT_HOSTNAME_LEN    64

src/inc/taosmsg.h

@@ -305,6 +305,8 @@ typedef struct {
   char clientVersion[TSDB_VERSION_LEN];
   char msgVersion[TSDB_VERSION_LEN];
   char db[TSDB_TABLE_FNAME_LEN];
+  char appName[TSDB_APPNAME_LEN];
+  int32_t pid;
 } SCMConnectMsg;
 
 typedef struct {
@@ -746,6 +748,7 @@ typedef struct {
   uint32_t queryId;
   int64_t  useconds;
   int64_t  stime;
+  uint64_t qHandle;
 } SQueryDesc;
 
 typedef struct {
@@ -761,8 +764,10 @@ typedef struct {
 
 typedef struct {
   uint32_t connId;
+  int32_t  pid;
   int32_t  numOfQueries;
   int32_t  numOfStreams;
+  char     appName[TSDB_APPNAME_LEN];
   char     pData[];
 } SCMHeartBeatMsg;
 

src/mnode/inc/mnodeProfile.h

@@ -23,6 +23,8 @@ extern "C" {
 
 typedef struct {
   char     user[TSDB_USER_LEN];
+  char     appName[TSDB_APPNAME_LEN];  // app name that invokes taosc
+  uint32_t pid;                        // pid of app that invokes taosc
   int8_t   killed;
   uint16_t port;
   uint32_t ip;
@@ -40,7 +42,7 @@ typedef struct {
 int32_t mnodeInitProfile();
 void    mnodeCleanupProfile();
 
-SConnObj *mnodeCreateConn(char *user, uint32_t ip, uint16_t port);
+SConnObj *mnodeCreateConn(char *user, uint32_t ip, uint16_t port, int32_t pid, const char* app);
 SConnObj *mnodeAccquireConn(int32_t connId, char *user, uint32_t ip, uint16_t port);
 void      mnodeReleaseConn(SConnObj *pConn);
 int32_t   mnodeSaveQueryStreamList(SConnObj *pConn, SCMHeartBeatMsg *pHBMsg);

src/mnode/src/mnodeCluster.c

@@ -224,7 +224,8 @@ static int32_t mnodeRetrieveClusters(SShowObj *pShow, char *data, int32_t rows,
     mnodeDecClusterRef(pCluster);
     numOfRows++;
   }
-  mnodeVacuumResult(data, cols, numOfRows, rows, pShow);
+
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
   pShow->numOfReads += numOfRows;
   return numOfRows;
 }

src/mnode/src/mnodeDb.c

@@ -760,7 +760,7 @@ static int32_t mnodeRetrieveDbs(SShowObj *pShow, char *data, int32_t rows, void
   }
 
   pShow->numOfReads += numOfRows;
-  mnodeVacuumResult(data, cols, numOfRows, rows, pShow);
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
 
   mnodeDecUserRef(pUser);
   return numOfRows;

src/mnode/src/mnodeDnode.c

@@ -790,6 +790,7 @@ static int32_t mnodeRetrieveDnodes(SShowObj *pShow, char *data, int32_t rows, vo
     mnodeDecDnodeRef(pDnode);
   }
 
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
   pShow->numOfReads += numOfRows;
   return numOfRows;
 }
@@ -891,8 +892,8 @@ int32_t mnodeRetrieveModules(SShowObj *pShow, char *data, int32_t rows, void *pC
 
     mnodeDecDnodeRef(pDnode);
   }
-  mnodeVacuumResult(data, cols, numOfRows, rows, pShow);
 
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
   pShow->numOfReads += numOfRows;
   return numOfRows;
 }
@@ -992,6 +993,7 @@ static int32_t mnodeRetrieveConfigs(SShowObj *pShow, char *data, int32_t rows, v
     }
   }
 
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
   pShow->numOfReads += numOfRows;
   return numOfRows;
 }
@@ -1083,8 +1085,8 @@ static int32_t mnodeRetrieveVnodes(SShowObj *pShow, char *data, int32_t rows, vo
   } else {
     numOfRows = 0;
   }
-  mnodeVacuumResult(data, cols, numOfRows, rows, pShow);
 
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
   pShow->numOfReads += numOfRows;
   return numOfRows;
 }

src/mnode/src/mnodeMnode.c

@@ -480,8 +480,8 @@ static int32_t mnodeRetrieveMnodes(SShowObj *pShow, char *data, int32_t rows, vo
 
     mnodeDecMnodeRef(pMnode);
   }
-  mnodeVacuumResult(data, cols, numOfRows, rows, pShow);
 
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
   pShow->numOfReads += numOfRows;
 
   return numOfRows;

src/mnode/src/mnodeProfile.c

@@ -24,15 +24,9 @@
 #include "mnode.h"
 #include "mnodeDef.h"
 #include "mnodeInt.h"
-#include "mnodeAcct.h"
-#include "mnodeDnode.h"
-#include "mnodeDb.h"
-#include "mnodeMnode.h"
 #include "mnodeProfile.h"
 #include "mnodeShow.h"
-#include "mnodeTable.h"
 #include "mnodeUser.h"
-#include "mnodeVgroup.h"
 #include "mnodeWrite.h"
 
 #define CONN_KEEP_TIME  (tsShellActivityTimer * 3)
@@ -78,7 +72,7 @@ void mnodeCleanupProfile() {
   }
 }
 
-SConnObj *mnodeCreateConn(char *user, uint32_t ip, uint16_t port) {
+SConnObj *mnodeCreateConn(char *user, uint32_t ip, uint16_t port, int32_t pid, const char* app) {
 #if 0
   int32_t connSize = taosHashGetSize(tsMnodeConnCache->pHashTable);
   if (connSize > tsMaxShellConns) {
@@ -96,10 +90,13 @@ SConnObj *mnodeCreateConn(char *user, uint32_t ip, uint16_t port) {
     .ip     = ip,
     .port   = port,
     .connId = connId,
-    .stime  = taosGetTimestampMs()
+    .stime  = taosGetTimestampMs(),
+    .pid    = pid,
   };
 
-  tstrncpy(connObj.user, user, sizeof(connObj.user));
+  tstrncpy(connObj.user, user, tListLen(connObj.user));
+  tstrncpy(connObj.appName, app, tListLen(connObj.appName));
+
   connObj.lastAccess = connObj.stime;
 
   SConnObj *pConn = taosCachePut(tsMnodeConnCache, &connId, sizeof(int32_t), &connObj, sizeof(connObj), CONN_KEEP_TIME * 1000);
@@ -183,6 +180,20 @@ static int32_t mnodeGetConnsMeta(STableMetaMsg *pMeta, SShowObj *pShow, void *pC
   pSchema[cols].bytes = htons(pShow->bytes[cols]);
   cols++;
 
+  // app name
+  pShow->bytes[cols] = TSDB_APPNAME_LEN + VARSTR_HEADER_SIZE;
+  pSchema[cols].type = TSDB_DATA_TYPE_BINARY;
+  strcpy(pSchema[cols].name, "app_name");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  // app pid
+  pShow->bytes[cols] = 4;
+  pSchema[cols].type = TSDB_DATA_TYPE_INT;
+  strcpy(pSchema[cols].name, "pid");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
   pShow->bytes[cols] = TSDB_IPv4ADDR_LEN + 6 + VARSTR_HEADER_SIZE;
   pSchema[cols].type = TSDB_DATA_TYPE_BINARY;
   strcpy(pSchema[cols].name, "ip:port");
@@ -191,13 +202,13 @@ static int32_t mnodeGetConnsMeta(STableMetaMsg *pMeta, SShowObj *pShow, void *pC
 
   pShow->bytes[cols] = 8;
   pSchema[cols].type = TSDB_DATA_TYPE_TIMESTAMP;
-  strcpy(pSchema[cols].name, "login time");
+  strcpy(pSchema[cols].name, "login_time");
   pSchema[cols].bytes = htons(pShow->bytes[cols]);
   cols++;
 
   pShow->bytes[cols] = 8;
   pSchema[cols].type = TSDB_DATA_TYPE_TIMESTAMP;
-  strcpy(pSchema[cols].name, "last access");
+  strcpy(pSchema[cols].name, "last_access");
   pSchema[cols].bytes = htons(pShow->bytes[cols]);
   cols++;
 
@@ -236,6 +247,16 @@ static int32_t mnodeRetrieveConns(SShowObj *pShow, char *data, int32_t rows, voi
     STR_WITH_MAXSIZE_TO_VARSTR(pWrite, pConnObj->user, pShow->bytes[cols]);
     cols++;
 
+    // app name
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    STR_WITH_MAXSIZE_TO_VARSTR(pWrite, pConnObj->appName, pShow->bytes[cols]);
+    cols++;
+
+    // app pid
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int32_t*)pWrite = pConnObj->pid;
+    cols++;
+
     pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
     snprintf(ipStr, sizeof(ipStr), "%s:%u", taosIpStr(pConnObj->ip), pConnObj->port);
     STR_WITH_MAXSIZE_TO_VARSTR(pWrite, ipStr, pShow->bytes[cols]);
@@ -254,8 +275,7 @@ static int32_t mnodeRetrieveConns(SShowObj *pShow, char *data, int32_t rows, voi
   }
 
   pShow->numOfReads += numOfRows;
-  const int32_t NUM_OF_COLUMNS = 5;
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
-  mnodeVacuumResult(data, NUM_OF_COLUMNS, numOfRows, rows, pShow);
   
   return numOfRows;
 }
@@ -299,7 +319,7 @@ static int32_t mnodeGetQueryMeta(STableMetaMsg *pMeta, SShowObj *pShow, void *pC
 
   pShow->bytes[cols] = QUERY_ID_SIZE + VARSTR_HEADER_SIZE;
   pSchema[cols].type = TSDB_DATA_TYPE_BINARY;
-  strcpy(pSchema[cols].name, "queryId");
+  strcpy(pSchema[cols].name, "query_id");
   pSchema[cols].bytes = htons(pShow->bytes[cols]);
   cols++;
 
@@ -315,9 +335,15 @@ static int32_t mnodeGetQueryMeta(STableMetaMsg *pMeta, SShowObj *pShow, void *pC
   pSchema[cols].bytes = htons(pShow->bytes[cols]);
   cols++;
 
+  pShow->bytes[cols] = 24;
+  pSchema[cols].type = TSDB_DATA_TYPE_BINARY;
+  strcpy(pSchema[cols].name, "qhandle");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
   pShow->bytes[cols] = 8;
   pSchema[cols].type = TSDB_DATA_TYPE_TIMESTAMP;
-  strcpy(pSchema[cols].name, "created time");
+  strcpy(pSchema[cols].name, "created_time");
   pSchema[cols].bytes = htons(pShow->bytes[cols]);
   cols++;
 
@@ -352,7 +378,7 @@ static int32_t mnodeRetrieveQueries(SShowObj *pShow, char *data, int32_t rows, v
   SConnObj *pConnObj = NULL;
   int32_t   cols = 0;
   char *    pWrite;
-  char      ipStr[TSDB_IPv4ADDR_LEN + 6];
+  char      str[TSDB_IPv4ADDR_LEN + 6] = {0};
 
   while (numOfRows < rows) {
     pShow->pIter = mnodeGetNextConn(pShow->pIter, &pConnObj);
@@ -362,9 +388,9 @@ static int32_t mnodeRetrieveQueries(SShowObj *pShow, char *data, int32_t rows, v
       SQueryDesc *pDesc = pConnObj->pQueries + i;
       cols = 0;
 
-      snprintf(ipStr, QUERY_ID_SIZE + 1, "%u:%u", pConnObj->connId, htonl(pDesc->queryId));
+      snprintf(str, QUERY_ID_SIZE + 1, "%u:%u", pConnObj->connId, htonl(pDesc->queryId));
       pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
-      STR_WITH_MAXSIZE_TO_VARSTR(pWrite, ipStr, pShow->bytes[cols]);
+      STR_WITH_MAXSIZE_TO_VARSTR(pWrite, str, pShow->bytes[cols]);
       cols++;
 
       pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
@@ -372,8 +398,15 @@ static int32_t mnodeRetrieveQueries(SShowObj *pShow, char *data, int32_t rows, v
       cols++;
 
       pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
-      snprintf(ipStr, sizeof(ipStr), "%s:%u", taosIpStr(pConnObj->ip), pConnObj->port);
+      snprintf(str, tListLen(str), "%s:%u", taosIpStr(pConnObj->ip), pConnObj->port);
-      STR_WITH_MAXSIZE_TO_VARSTR(pWrite, ipStr, pShow->bytes[cols]);
+      STR_WITH_MAXSIZE_TO_VARSTR(pWrite, str, pShow->bytes[cols]);
+      cols++;
+
+      char handleBuf[24] = {0};
+      snprintf(handleBuf, tListLen(handleBuf), "%p", (void*)htobe64(pDesc->qHandle));
+      pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+
+      STR_WITH_MAXSIZE_TO_VARSTR(pWrite, handleBuf, pShow->bytes[cols]);
       cols++;
 
       pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
@@ -393,8 +426,7 @@ static int32_t mnodeRetrieveQueries(SShowObj *pShow, char *data, int32_t rows, v
   }
 
   pShow->numOfReads += numOfRows;
-  const int32_t NUM_OF_COLUMNS = 6;
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
-  mnodeVacuumResult(data, NUM_OF_COLUMNS, numOfRows, rows, pShow);
   return numOfRows;
 }
 
@@ -522,8 +554,7 @@ static int32_t mnodeRetrieveStreams(SShowObj *pShow, char *data, int32_t rows, v
   }
 
   pShow->numOfReads += numOfRows;
-  const int32_t NUM_OF_COLUMNS = 8;
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
-  mnodeVacuumResult(data, NUM_OF_COLUMNS, numOfRows, rows, pShow);
   return numOfRows;
 }
 

src/mnode/src/mnodeShow.c

@@ -186,7 +186,7 @@ static int32_t mnodeProcessRetrieveMsg(SMnodeMsg *pMsg) {
     rowsToRead = pShow->numOfRows - pShow->numOfReads;
   }
 
-  /* return no more than 100 meters in one round trip */
+  /* return no more than 100 tables in one round trip */
   if (rowsToRead > 100) rowsToRead = 100;
 
   /*
@@ -244,7 +244,8 @@ static int32_t mnodeProcessHeartBeatMsg(SMnodeMsg *pMsg) {
   int32_t connId = htonl(pHBMsg->connId);
   SConnObj *pConn = mnodeAccquireConn(connId, connInfo.user, connInfo.clientIp, connInfo.clientPort);
   if (pConn == NULL) {
-    pConn = mnodeCreateConn(connInfo.user, connInfo.clientIp, connInfo.clientPort);
+    pHBMsg->pid = htonl(pHBMsg->pid);
+    pConn = mnodeCreateConn(connInfo.user, connInfo.clientIp, connInfo.clientPort, pHBMsg->pid, pHBMsg->appName);
   }
 
   if (pConn == NULL) {
@@ -325,7 +326,8 @@ static int32_t mnodeProcessConnectMsg(SMnodeMsg *pMsg) {
     goto connect_over;
   }
 
-  SConnObj *pConn = mnodeCreateConn(connInfo.user, connInfo.clientIp, connInfo.clientPort);
+  pConnectMsg->pid = htonl(pConnectMsg->pid);
+  SConnObj *pConn = mnodeCreateConn(connInfo.user, connInfo.clientIp, connInfo.clientPort, pConnectMsg->pid, pConnectMsg->appName);
   if (pConn == NULL) {
     code = terrno;
   } else {

src/mnode/src/mnodeTable.c

@@ -63,27 +63,27 @@ static int32_t mnodeRetrieveShowSuperTables(SShowObj *pShow, char *data, int32_t
 static int32_t mnodeGetStreamTableMeta(STableMetaMsg *pMeta, SShowObj *pShow, void *pConn);
 static int32_t mnodeRetrieveStreamTables(SShowObj *pShow, char *data, int32_t rows, void *pConn);
  
-static int32_t mnodeProcessCreateTableMsg(SMnodeMsg *mnodeMsg);
+static int32_t mnodeProcessCreateTableMsg(SMnodeMsg *pMsg);
 static int32_t mnodeProcessCreateSuperTableMsg(SMnodeMsg *pMsg);
 static int32_t mnodeProcessCreateChildTableMsg(SMnodeMsg *pMsg);
 static void    mnodeProcessCreateChildTableRsp(SRpcMsg *rpcMsg);
 
-static int32_t mnodeProcessDropTableMsg(SMnodeMsg *mnodeMsg);
+static int32_t mnodeProcessDropTableMsg(SMnodeMsg *pMsg);
 static int32_t mnodeProcessDropSuperTableMsg(SMnodeMsg *pMsg);
 static void    mnodeProcessDropSuperTableRsp(SRpcMsg *rpcMsg);
 static int32_t mnodeProcessDropChildTableMsg(SMnodeMsg *pMsg);
 static void    mnodeProcessDropChildTableRsp(SRpcMsg *rpcMsg);
 
-static int32_t mnodeProcessSuperTableVgroupMsg(SMnodeMsg *mnodeMsg);
+static int32_t mnodeProcessSuperTableVgroupMsg(SMnodeMsg *pMsg);
-static int32_t mnodeProcessMultiTableMetaMsg(SMnodeMsg *mnodeMsg);
+static int32_t mnodeProcessMultiTableMetaMsg(SMnodeMsg *pMsg);
-static int32_t mnodeProcessTableCfgMsg(SMnodeMsg *mnodeMsg);
+static int32_t mnodeProcessTableCfgMsg(SMnodeMsg *pMsg);
 
-static int32_t mnodeProcessTableMetaMsg(SMnodeMsg *mnodeMsg);
+static int32_t mnodeProcessTableMetaMsg(SMnodeMsg *pMsg);
 static int32_t mnodeGetSuperTableMeta(SMnodeMsg *pMsg);
 static int32_t mnodeGetChildTableMeta(SMnodeMsg *pMsg);
 static int32_t mnodeAutoCreateChildTable(SMnodeMsg *pMsg);
 
-static int32_t mnodeProcessAlterTableMsg(SMnodeMsg *mnodeMsg);
+static int32_t mnodeProcessAlterTableMsg(SMnodeMsg *pMsg);
 static void    mnodeProcessAlterTableRsp(SRpcMsg *rpcMsg);
 
 static int32_t mnodeFindSuperTableColumnIndex(SSuperTableObj *pStable, char *colName);
@@ -1384,9 +1384,8 @@ int32_t mnodeRetrieveShowSuperTables(SShowObj *pShow, char *data, int32_t rows,
   }
 
   pShow->numOfReads += numOfRows;
-  const int32_t NUM_OF_COLUMNS = 5;
 
-  mnodeVacuumResult(data, NUM_OF_COLUMNS, numOfRows, rows, pShow);
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
   mnodeDecDbRef(pDb);
 
   return numOfRows;
@@ -2543,6 +2542,25 @@ static int32_t mnodeGetShowTableMeta(STableMetaMsg *pMeta, SShowObj *pShow, void
   pSchema[cols].bytes = htons(pShow->bytes[cols]);
   cols++;
 
+  pShow->bytes[cols] = 8; // table uid
+  pSchema[cols].type = TSDB_DATA_TYPE_BIGINT;
+  strcpy(pSchema[cols].name, "uid");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 4;
+  pSchema[cols].type = TSDB_DATA_TYPE_INT;
+  strcpy(pSchema[cols].name, "tid");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 4;
+  pSchema[cols].type = TSDB_DATA_TYPE_INT;
+  strcpy(pSchema[cols].name, "vgId");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+
   pMeta->numOfColumns = htons(cols);
   pShow->numOfColumns = cols;
 
@@ -2568,6 +2586,7 @@ static int32_t mnodeRetrieveShowTables(SShowObj *pShow, char *data, int32_t rows
     return 0;
   }
 
+  int32_t cols       = 0;
   int32_t numOfRows  = 0;
   SChildTableObj *pTable = NULL;
   SPatternCompareInfo info = PATTERN_COMPARE_INFO_INITIALIZER;
@@ -2608,8 +2627,7 @@ static int32_t mnodeRetrieveShowTables(SShowObj *pShow, char *data, int32_t rows
       continue;
     }
 
-    int32_t cols = 0;
+    cols = 0;
-
     char *pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
 
     STR_WITH_MAXSIZE_TO_VARSTR(pWrite, tableName, pShow->bytes[cols]);
@@ -2638,14 +2656,29 @@ static int32_t mnodeRetrieveShowTables(SShowObj *pShow, char *data, int32_t rows
     
     cols++;
 
+    // uid
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int64_t*) pWrite = pTable->uid;
+    cols++;
+
+
+    // tid
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int32_t*) pWrite = pTable->sid;
+    cols++;
+
+    //vgid
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int32_t*) pWrite = pTable->vgId;
+    cols++;
+
     numOfRows++;
     mnodeDecTableRef(pTable);
   }
 
   pShow->numOfReads += numOfRows;
-  const int32_t NUM_OF_COLUMNS = 4;
 
-  mnodeVacuumResult(data, NUM_OF_COLUMNS, numOfRows, rows, pShow);
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
   mnodeDecDbRef(pDb);
   free(pattern);
 
@@ -2843,9 +2876,8 @@ static int32_t mnodeRetrieveStreamTables(SShowObj *pShow, char *data, int32_t ro
   }
 
   pShow->numOfReads += numOfRows;
-  const int32_t NUM_OF_COLUMNS = 4;
 
-  mnodeVacuumResult(data, NUM_OF_COLUMNS, numOfRows, rows, pShow);
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
   mnodeDecDbRef(pDb);
 
   return numOfRows;

src/mnode/src/mnodeUser.c

@@ -385,8 +385,8 @@ static int32_t mnodeRetrieveUsers(SShowObj *pShow, char *data, int32_t rows, voi
     numOfRows++;
     mnodeDecUserRef(pUser);
   }
-  mnodeVacuumResult(data, cols, numOfRows, rows, pShow);
 
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
   pShow->numOfReads += numOfRows;
   return numOfRows;
 }

src/mnode/src/mnodeVgroup.c

@@ -771,7 +771,8 @@ static int32_t mnodeRetrieveVgroups(SShowObj *pShow, char *data, int32_t rows, v
     mnodeDecVgroupRef(pVgroup);
     numOfRows++;
   }
-  mnodeVacuumResult(data, cols, numOfRows, rows, pShow);
+
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
 
   pShow->numOfReads += numOfRows;
   mnodeDecTableRef(pTable);

src/os/inc/osSemphone.h

@@ -33,6 +33,8 @@ bool taosCheckPthreadValid(pthread_t thread);
 int64_t taosGetPthreadId();
 void taosResetPthread(pthread_t *thread);
 bool taosComparePthread(pthread_t first, pthread_t second);
+int32_t taosGetPId();
+int32_t taosGetCurrentAPPName(char *name, int32_t* len);
 
 #ifdef __cplusplus
 }

src/os/src/detail/osSemphone.c

@@ -34,5 +34,31 @@ bool    taosCheckPthreadValid(pthread_t thread) { return thread != 0; }
 int64_t taosGetPthreadId() { return (int64_t)pthread_self(); }
 void    taosResetPthread(pthread_t *thread) { *thread = 0; }
 bool    taosComparePthread(pthread_t first, pthread_t second) { return first == second; }
+int32_t taosGetPId() { return getpid(); }
+
+int32_t taosGetCurrentAPPName(char *name, int32_t* len) {
+  const char* self = "/proc/self/exe";
+  char path[PATH_MAX] = {0};
+
+  if (readlink(self, path, PATH_MAX) <= 0) {
+    return -1;
+  }
+
+  path[PATH_MAX - 1] = 0;
+  char* end = strrchr(path, '/');
+  if (end == NULL) {
+    return -1;
+  }
+
+  ++end;
+
+  strcpy(name, end);
+
+  if (len != NULL) {
+    *len = strlen(name);
+  }
+
+  return 0;
+}
 
 #endif

src/os/src/detail/osSysinfo.c

@@ -203,7 +203,7 @@ static void taosGetSystemTimezone() {
   snprintf(tsTimezone, TSDB_TIMEZONE_LEN, "%s (%s, %s%02d00)", buf, tzname[daylight], tz >= 0 ? "+" : "-", abs(tz));
 
   // cfg_timezone->cfgStatus = TAOS_CFG_CSTATUS_DEFAULT;
-  uInfo("timezone not configured, set to system default:%s", tsTimezone);
+  uWarn("timezone not configured, set to system default:%s", tsTimezone);
 }
 
 /*
@@ -235,7 +235,7 @@ static void taosGetSystemLocale() {  // get and set default locale
       strcpy(tsLocale, "en_US.UTF-8");
     } else {
       tstrncpy(tsLocale, locale, TSDB_LOCALE_LEN);
-      uError("locale not configured, set to system default:%s", tsLocale);
+      uWarn("locale not configured, set to system default:%s", tsLocale);
     }
   }
 

src/os/src/windows/wSemphone.c

@@ -36,3 +36,21 @@ int64_t taosGetPthreadId() {
 bool taosComparePthread(pthread_t first, pthread_t second) {
   return first.p == second.p;
 }
+
+int32_t taosGetPId() {
+  return GetCurrentProcessId();
+}
+
+int32_t taosGetCurrentAPPName(char *name, int32_t* len) {
+  char filepath[1024] = {0};
+
+  GetModuleFileName(NULL, filepath, MAX_PATH);
+  *strrchr(filepath,'.') = '\0';
+  strcpy(name, filepath);
+
+  if (len != NULL) {
+    *len = (int32_t) strlen(filepath);
+  }
+
+  return 0;
+}

src/util/src/tcache.c

@@ -107,12 +107,14 @@ static FORCE_INLINE void taosCacheReleaseNode(SCacheObj *pCacheObj, SCacheDataNo
   free(pNode);
 }
 
-static FORCE_INLINE void doRemoveElemInTrashcan(SCacheObj* pCacheObj, STrashElem *pElem) {
+static FORCE_INLINE STrashElem* doRemoveElemInTrashcan(SCacheObj* pCacheObj, STrashElem *pElem) {
   if (pElem->pData->signature != (uint64_t) pElem->pData) {
     uWarn("key:sig:0x%" PRIx64 " %p data has been released, ignore", pElem->pData->signature, pElem->pData);
-    return;
+    return NULL;
   }
 
+  STrashElem* next = pElem->next;
+
   pCacheObj->numOfElemsInTrash--;
   if (pElem->prev) {
     pElem->prev->next = pElem->next;
@@ -120,9 +122,15 @@ static FORCE_INLINE void doRemoveElemInTrashcan(SCacheObj* pCacheObj, STrashElem
     pCacheObj->pTrash = pElem->next;
   }
 
-  if (pElem->next) {
+  if (next) {
-    pElem->next->prev = pElem->prev;
+    next->prev = pElem->prev;
   }
+
+  if (pCacheObj->numOfElemsInTrash == 0) {
+    assert(pCacheObj->pTrash == NULL);
+  }
+
+  return next;
 }
 
 static FORCE_INLINE void doDestroyTrashcanElem(SCacheObj* pCacheObj, STrashElem *pElem) {
@@ -559,31 +567,30 @@ void taosTrashcanEmpty(SCacheObj *pCacheObj, bool force) {
 
   if (pCacheObj->numOfElemsInTrash == 0) {
     if (pCacheObj->pTrash != NULL) {
+      pCacheObj->pTrash = NULL;
       uError("cache:%s, key:inconsistency data in cache, numOfElem in trashcan:%d", pCacheObj->name, pCacheObj->numOfElemsInTrash);
     }
 
-    pCacheObj->pTrash = NULL;
     __cache_unlock(pCacheObj);
     return;
   }
 
-  STrashElem *pElem = pCacheObj->pTrash;
+  const char* stat[] = {"false", "true"};
+  uDebug("cache:%s start to cleanup trashcan, numOfElem in trashcan:%d, free:%s", pCacheObj->name,
+      pCacheObj->numOfElemsInTrash, (force? stat[1]:stat[0]));
 
+  STrashElem *pElem = pCacheObj->pTrash;
   while (pElem) {
     T_REF_VAL_CHECK(pElem->pData);
-    if (pElem->next == pElem) {
+    assert(pElem->next != pElem && pElem->prev != pElem);
-      pElem->next = NULL;
-    }
 
     if (force || (T_REF_VAL_GET(pElem->pData) == 0)) {
       uDebug("cache:%s, key:%p, %p removed from trashcan. numOfElem in trashcan:%d", pCacheObj->name, pElem->pData->key, pElem->pData->data,
              pCacheObj->numOfElemsInTrash - 1);
 
-      STrashElem *p = pElem;
+      doRemoveElemInTrashcan(pCacheObj, pElem);
-      pElem = pElem->next;
+      doDestroyTrashcanElem(pCacheObj, pElem);
-
+      pElem = pCacheObj->pTrash;
-      doRemoveElemInTrashcan(pCacheObj, p);
-      doDestroyTrashcanElem(pCacheObj, p);
     } else {
       pElem = pElem->next;
     }

src/vnode/src/vnodeRead.c

@@ -261,6 +261,7 @@ static int32_t vnodeProcessFetchMsg(SVnodeObj *pVnode, SReadMsg *pReadMsg) {
   if (vnodeNotifyCurrentQhandle(pReadMsg->rpcMsg.handle, *handle, pVnode->vgId) != TSDB_CODE_SUCCESS) {
     vError("vgId:%d, QInfo:%p, retrieve discarded since link is broken, %p", pVnode->vgId, *handle, pReadMsg->rpcMsg.handle);
     code = TSDB_CODE_RPC_NETWORK_UNAVAIL;
+    qKillQuery(*handle);
     qReleaseQInfo(pVnode->qMgmt, (void**) &handle, true);
     return code;
   }