diff --git a/src/client/inc/tscUtil.h b/src/client/inc/tscUtil.h
index bd9cd4a250581aac1682252dfe048125eab242a9..231d52bae4eae56909d27fc3a6113e1c8ad134ef 100644
--- a/src/client/inc/tscUtil.h
+++ b/src/client/inc/tscUtil.h
@@ -139,11 +139,11 @@ bool isSimpleAggregate(SQueryInfo* pQueryInfo);
 bool isBlockDistQuery(SQueryInfo* pQueryInfo);
 int32_t tscGetTopbotQueryParam(SQueryInfo* pQueryInfo);
 
-bool tscNonOrderedProjectionQueryOnSTable(SSqlCmd *pCmd, SQueryInfo *pQueryInfo, int32_t tableIndex);
-bool tscOrderedProjectionQueryOnSTable(SSqlCmd *pCmd, SQueryInfo* pQueryInfo, int32_t tableIndex);
-bool tscIsProjectionQueryOnSTable(SSqlCmd *pCmd, SQueryInfo* pQueryInfo, int32_t tableIndex);
+bool tscNonOrderedProjectionQueryOnSTable(SQueryInfo *pQueryInfo, int32_t tableIndex);
+bool tscOrderedProjectionQueryOnSTable(SQueryInfo* pQueryInfo, int32_t tableIndex);
+bool tscIsProjectionQueryOnSTable(SQueryInfo* pQueryInfo, int32_t tableIndex);
 
-bool tscIsProjectionQuery(SSqlCmd* pCmd, SQueryInfo* pQueryInfo);
+bool tscIsProjectionQuery(SQueryInfo* pQueryInfo);
 
 bool tscIsTwoStageSTableQuery(SSqlCmd *pCmd, SQueryInfo* pQueryInfo, int32_t tableIndex);
 bool tscQueryTags(SQueryInfo* pQueryInfo);
@@ -246,7 +246,7 @@ void tscVgroupTableCopy(SVgroupTableInfo* info, SVgroupTableInfo* pInfo);
 int  tscGetSTableVgroupInfo(SSqlObj* pSql, int32_t clauseIndex);
 int  tscGetTableMeta(SSqlObj* pSql, STableMetaInfo* pTableMetaInfo);
 int  tscGetTableMetaEx(SSqlObj* pSql, STableMetaInfo* pTableMetaInfo, bool createIfNotExists);
-int32_t tscGetUdfFromNode(SSqlObj *pSql);
+int32_t tscGetUdfFromNode(SSqlObj *pSql, SQueryInfo* pQueryInfo);
 
 void tscResetForNextRetrieve(SSqlRes* pRes);
 void tscDoQuery(SSqlObj* pSql);
diff --git a/src/client/inc/tsclient.h b/src/client/inc/tsclient.h
index 0ffafe6c01f1e505e1caae824dcdcf3b5ef34e33..4d21337497d954e1fc44537ac8fc6d0358c01871 100644
--- a/src/client/inc/tsclient.h
+++ b/src/client/inc/tsclient.h
@@ -240,6 +240,7 @@ typedef struct SQueryInfo {
   int32_t            havingFieldNum;
   bool               globalMerge; // need global merge
   bool               arithmCalOnAgg; // arithmetic calculation on aggregate result.
+  SArray            *pUdfInfo;       // user defined function information SArray<SUdfInfo>  
 } SQueryInfo;
 
 typedef struct {
@@ -284,7 +285,6 @@ typedef struct {
 
   SHashObj    *pTableBlockHashList;     // data block for each table
   SArray      *pDataBlocks;             // SArray<STableDataBlocks*>. Merged submit block for each vgroup
-  SArray      *pUdfInfo;       // user defined function information SArray<SUdfInfo>
 } SSqlCmd;
 
 typedef struct SResRec {
diff --git a/src/client/src/tscLocalMerge.c b/src/client/src/tscLocalMerge.c
index a4bfa4f38f864a34339cd301c08445b46b3b8904..3450a3173fe76ae545251d861d8d34f5c0ed4e13 100644
--- a/src/client/src/tscLocalMerge.c
+++ b/src/client/src/tscLocalMerge.c
@@ -306,7 +306,7 @@ void tscCreateLocalMerger(tExtMemBuffer **pMemBuffer, int32_t numOfBuffer, tOrde
   pMerger->pDesc->pColumnModel->capacity = 1;
 
   // restore the limitation value at the last stage
-  if (tscOrderedProjectionQueryOnSTable(pCmd, pQueryInfo, 0)) {
+  if (tscOrderedProjectionQueryOnSTable(pQueryInfo, 0)) {
     pQueryInfo->limit.limit = pQueryInfo->clauseLimit;
     pQueryInfo->limit.offset = pQueryInfo->prjOffset;
   }
@@ -461,7 +461,7 @@ static int32_t createOrderDescriptor(tOrderDescriptor **pOrderDesc, SSqlCmd *pCm
   }
 
   // primary timestamp column is involved in final result
-  if (pQueryInfo->interval.interval != 0 || tscOrderedProjectionQueryOnSTable(pCmd, pQueryInfo, 0)) {
+  if (pQueryInfo->interval.interval != 0 || tscOrderedProjectionQueryOnSTable(pQueryInfo, 0)) {
     numOfGroupByCols++;
   }
 
@@ -617,7 +617,7 @@ int32_t tscLocalReducerEnvCreate(SSqlObj *pSql, tExtMemBuffer ***pMemBuffer, tOr
       type = pModel->pFields[i].field.type;
       bytes = pModel->pFields[i].field.bytes;
     } else if (functionId < 0) {
-      SUdfInfo* pUdfInfo = taosArrayGet(pCmd->pUdfInfo, -1 * functionId - 1);
+      SUdfInfo* pUdfInfo = taosArrayGet(pQueryInfo->pUdfInfo, -1 * functionId - 1);
       int32_t ret = getResultDataInfo(p1.type, p1.bytes, functionId, 0, &type, &bytes, &inter, 0, false, pUdfInfo);
       assert(ret == TSDB_CODE_SUCCESS);
 
@@ -801,6 +801,15 @@ static void doExecuteFinalMergeRv(SOperatorInfo* pOperator, int32_t numOfExpr, S
           if (functionId == TSDB_FUNC_TAG_DUMMY || functionId == TSDB_FUNC_TS_DUMMY) {
             continue;
           }
+
+          if (functionId < 0) {
+            SUdfInfo* pUdfInfo = taosArrayGet(pInfo->udfInfo, -1 * functionId - 1);
+            
+            doInvokeUdf(pUdfInfo, &pCtx[j], 0, TSDB_UDF_FUNC_MERGE);
+
+            continue;
+          }
+          
           aAggs[functionId].mergeFunc(&pCtx[j]);
         }
       } else {
@@ -809,6 +818,15 @@ static void doExecuteFinalMergeRv(SOperatorInfo* pOperator, int32_t numOfExpr, S
           if (functionId == TSDB_FUNC_TAG_DUMMY || functionId == TSDB_FUNC_TS_DUMMY) {
             continue;
           }
+
+          if (functionId < 0) {
+            SUdfInfo* pUdfInfo = taosArrayGet(pInfo->udfInfo, -1 * functionId - 1);
+            
+            doInvokeUdf(pUdfInfo, &pCtx[j], 0, TSDB_UDF_FUNC_FINALIZE);
+
+            continue;
+          }
+          
           aAggs[functionId].xFinalize(&pCtx[j]);
         }
 
@@ -825,6 +843,10 @@ static void doExecuteFinalMergeRv(SOperatorInfo* pOperator, int32_t numOfExpr, S
         }
 
         for(int32_t j = 0; j < numOfExpr; ++j) {
+          if (pCtx[j].functionId < 0) {
+            continue;
+          }
+          
           aAggs[pCtx[j].functionId].init(&pCtx[j], pCtx[j].resultInfo);
         }
 
@@ -837,6 +859,15 @@ static void doExecuteFinalMergeRv(SOperatorInfo* pOperator, int32_t numOfExpr, S
           if (functionId == TSDB_FUNC_TAG_DUMMY || functionId == TSDB_FUNC_TS_DUMMY) {
             continue;
           }
+
+          if (functionId < 0) {
+            SUdfInfo* pUdfInfo = taosArrayGet(pInfo->udfInfo, -1 * functionId - 1);
+            
+            doInvokeUdf(pUdfInfo, &pCtx[j], 0, TSDB_UDF_FUNC_MERGE);
+
+            continue;
+          }
+          
           aAggs[functionId].mergeFunc(&pCtx[j]);
         }
       }
@@ -850,6 +881,15 @@ static void doExecuteFinalMergeRv(SOperatorInfo* pOperator, int32_t numOfExpr, S
         if (functionId == TSDB_FUNC_TAG_DUMMY || functionId == TSDB_FUNC_TS_DUMMY) {
           continue;
         }
+
+        if (functionId < 0) {
+          SUdfInfo* pUdfInfo = taosArrayGet(pInfo->udfInfo, -1 * functionId - 1);
+          
+          doInvokeUdf(pUdfInfo, &pCtx[j], 0, TSDB_UDF_FUNC_MERGE);
+
+          continue;
+        }
+          
         aAggs[functionId].mergeFunc(&pCtx[j]);
       }
     }
@@ -1103,6 +1143,11 @@ SSDataBlock* doGlobalAggregate(void* param, bool* newgroup) {
       { // reset output buffer
         for(int32_t j = 0; j < pOperator->numOfOutput; ++j) {
           SQLFunctionCtx* pCtx = &pAggInfo->binfo.pCtx[j];
+          if (pCtx->functionId < 0) {
+            clearOutputBuf(&pAggInfo->binfo, &pAggInfo->bufCapacity);
+            continue;
+          }
+          
           aAggs[pCtx->functionId].init(pCtx, pCtx->resultInfo);
         }
       }
@@ -1154,6 +1199,14 @@ SSDataBlock* doGlobalAggregate(void* param, bool* newgroup) {
         continue;
       }
 
+      if (functionId < 0) {
+        SUdfInfo* pUdfInfo = taosArrayGet(pAggInfo->udfInfo, -1 * functionId - 1);
+        
+        doInvokeUdf(pUdfInfo, &pAggInfo->binfo.pCtx[j], 0, TSDB_UDF_FUNC_FINALIZE);
+      
+        continue;
+      }
+
       aAggs[functionId].xFinalize(&pAggInfo->binfo.pCtx[j]);
     }
 
diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 51596c134748f9e9a87236cd68007bc3dd395784..691f21bab46de8a864607ddd42b5d064f92b7b44 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -83,7 +83,7 @@ static int32_t validateSelectNodeList(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SAr
 
 static bool validateIpAddress(const char* ip, size_t size);
 static bool hasUnsupportFunctionsForSTableQuery(SSqlCmd* pCmd, SQueryInfo* pQueryInfo);
-static bool functionCompatibleCheck(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, bool joinQuery, bool twQuery);
+static bool functionCompatibleCheck(SQueryInfo* pQueryInfo, bool joinQuery, bool twQuery);
 
 static int32_t validateGroupbyNode(SQueryInfo* pQueryInfo, SArray* pList, SSqlCmd* pCmd);
 
@@ -1774,13 +1774,12 @@ void genUdfList(SArray* pUdfInfo, tSqlExpr *pNode) {
   }
 }
 
-static int32_t checkForUdf(SSqlObj* pSql, SArray* pSelection) {
-  SSqlCmd* pCmd = &pSql->cmd;
-  if (pCmd->pUdfInfo != NULL) {
+static int32_t checkForUdf(SSqlObj* pSql, SQueryInfo* pQueryInfo, SArray* pSelection) {
+  if (pQueryInfo->pUdfInfo != NULL) {
     return TSDB_CODE_SUCCESS;
   }
 
-  pCmd->pUdfInfo = taosArrayInit(4, sizeof(struct SUdfInfo));
+  pQueryInfo->pUdfInfo = taosArrayInit(4, sizeof(struct SUdfInfo));
 
   size_t nExpr = taosArrayGetSize(pSelection);
 
@@ -1789,12 +1788,12 @@ static int32_t checkForUdf(SSqlObj* pSql, SArray* pSelection) {
 
     int32_t type = pItem->pNode->type;
     if (type == SQL_NODE_EXPR || type == SQL_NODE_SQLFUNCTION) {
-      genUdfList(pCmd->pUdfInfo, pItem->pNode);
+      genUdfList(pQueryInfo->pUdfInfo, pItem->pNode);
     }
   }
 
-  if (taosArrayGetSize(pCmd->pUdfInfo) > 0) {
-    return tscGetUdfFromNode(pSql);
+  if (taosArrayGetSize(pQueryInfo->pUdfInfo) > 0) {
+    return tscGetUdfFromNode(pSql, pQueryInfo);
   } else {
     return TSDB_CODE_SUCCESS;
   }
@@ -1845,7 +1844,7 @@ int32_t validateSelectNodeList(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SArray* pS
     if (type == SQL_NODE_SQLFUNCTION) {
       pItem->pNode->functionId = isValidFunction(pItem->pNode->operand.z, pItem->pNode->operand.n);
       if (pItem->pNode->functionId < 0) {
-        SUdfInfo* pUdfInfo = isValidUdf(pCmd->pUdfInfo, pItem->pNode->operand.z, pItem->pNode->operand.n);
+        SUdfInfo* pUdfInfo = isValidUdf(pQueryInfo->pUdfInfo, pItem->pNode->operand.z, pItem->pNode->operand.n);
         if (pUdfInfo == NULL) {
           return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg5);
         }
@@ -1890,7 +1889,7 @@ int32_t validateSelectNodeList(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SArray* pS
     addPrimaryTsColIntoResult(pQueryInfo);
   }
 
-  if (!functionCompatibleCheck(pCmd, pQueryInfo, joinQuery, timeWindowQuery)) {
+  if (!functionCompatibleCheck(pQueryInfo, joinQuery, timeWindowQuery)) {
     return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
   }
 
@@ -2700,7 +2699,7 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, int32_t col
     }
 
     default: {
-      SUdfInfo* pUdfInfo = isValidUdf(pCmd->pUdfInfo, pItem->pNode->operand.z, pItem->pNode->operand.n);
+      SUdfInfo* pUdfInfo = isValidUdf(pQueryInfo->pUdfInfo, pItem->pNode->operand.z, pItem->pNode->operand.n);
       if (pUdfInfo == NULL) {
         return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg9);
       }
@@ -3180,7 +3179,7 @@ static bool groupbyTagsOrNull(SQueryInfo* pQueryInfo) {
   return true;
 }
 
-static bool functionCompatibleCheck(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, bool joinQuery, bool twQuery) {
+static bool functionCompatibleCheck(SQueryInfo* pQueryInfo, bool joinQuery, bool twQuery) {
   int32_t startIdx = 0;
   int32_t aggUdf = 0;
   int32_t scalarUdf = 0;
@@ -3201,7 +3200,7 @@ static bool functionCompatibleCheck(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, bool
 
     int16_t functionId = pExpr1->base.functionId;
     if (functionId < 0) {
-       SUdfInfo* pUdfInfo = taosArrayGet(pCmd->pUdfInfo, -1 * functionId - 1);
+       SUdfInfo* pUdfInfo = taosArrayGet(pQueryInfo->pUdfInfo, -1 * functionId - 1);
        pUdfInfo->funcType == TSDB_UDF_TYPE_AGGREGATE ? ++aggUdf : ++scalarUdf;
 
        continue;
@@ -5257,7 +5256,7 @@ int32_t validateOrderbyNode(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SSqlNode* pSq
         pQueryInfo->order.orderColId = PRIMARYKEY_TIMESTAMP_COL_INDEX;
 
         // orderby ts query on super table
-        if (tscOrderedProjectionQueryOnSTable(pCmd, pQueryInfo, 0)) {
+        if (tscOrderedProjectionQueryOnSTable(pQueryInfo, 0)) {
           addPrimaryTsColIntoResult(pQueryInfo);
         }
       }
@@ -5635,7 +5634,7 @@ int32_t validateFunctionsInIntervalOrGroupbyQuery(SSqlCmd* pCmd, SQueryInfo* pQu
     SExprInfo* pExpr = tscSqlExprGet(pQueryInfo, k);
 
     if (pExpr->base.functionId < 0) {
-      SUdfInfo* pUdfInfo = taosArrayGet(pCmd->pUdfInfo, -1 * pExpr->base.functionId - 1);
+      SUdfInfo* pUdfInfo = taosArrayGet(pQueryInfo->pUdfInfo, -1 * pExpr->base.functionId - 1);
       if (pUdfInfo->funcType == TSDB_UDF_TYPE_SCALAR) {
         isProjectionFunction = true;
         break;
@@ -5885,13 +5884,13 @@ int32_t validateLimitNode(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, int32_t clauseI
   // todo refactor
   if (UTIL_TABLE_IS_SUPER_TABLE(pTableMetaInfo)) {
     if (!tscQueryTags(pQueryInfo)) {  // local handle the super table tag query
-      if (tscIsProjectionQueryOnSTable(pCmd, pQueryInfo, 0)) {
+      if (tscIsProjectionQueryOnSTable(pQueryInfo, 0)) {
         if (pQueryInfo->slimit.limit > 0 || pQueryInfo->slimit.offset > 0) {
           return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
         }
 
         // for projection query on super table, all queries are subqueries
-        if (tscNonOrderedProjectionQueryOnSTable(pCmd, pQueryInfo, 0) &&
+        if (tscNonOrderedProjectionQueryOnSTable(pQueryInfo, 0) &&
             !TSDB_QUERY_HAS_TYPE(pQueryInfo->type, TSDB_QUERY_TYPE_JOIN_QUERY)) {
           pQueryInfo->type |= TSDB_QUERY_TYPE_SUBQUERY;
         }
@@ -5927,7 +5926,7 @@ int32_t validateLimitNode(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, int32_t clauseI
     pQueryInfo->prjOffset   = pQueryInfo->limit.offset;
     pQueryInfo->vgroupLimit = -1;
 
-    if (tscOrderedProjectionQueryOnSTable(pCmd, pQueryInfo, 0)) {
+    if (tscOrderedProjectionQueryOnSTable(pQueryInfo, 0)) {
       /*
        * the offset value should be removed during retrieve data from virtual node, since the
        * global order are done in client side, so the offset is applied at the client side
@@ -6280,7 +6279,7 @@ static int32_t checkUpdateTagPrjFunctions(SQueryInfo* pQueryInfo, SSqlCmd* pCmd)
     }
 
     if (functionId < 0) {
-      SUdfInfo* pUdfInfo = taosArrayGet(pCmd->pUdfInfo, -1 * functionId - 1);
+      SUdfInfo* pUdfInfo = taosArrayGet(pQueryInfo->pUdfInfo, -1 * functionId - 1);
       if (pUdfInfo->funcType == TSDB_UDF_TYPE_AGGREGATE) {
         ++numOfAggregation;
       }
@@ -6526,7 +6525,7 @@ int32_t doFunctionsCompatibleCheck(SSqlCmd* pCmd, SQueryInfo* pQueryInfo) {
     }
 
     // projection query on super table does not compatible with "group by" syntax
-    if (tscIsProjectionQuery(pCmd, pQueryInfo)) {
+    if (tscIsProjectionQuery(pQueryInfo)) {
       return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg3);
     }
 
@@ -6708,7 +6707,7 @@ void tscPrintSelNodeList(SSqlObj* pSql, int32_t subClauseIndex) {
     char   *name = NULL;
 
     if (pExpr->base.functionId < 0) {
-      SUdfInfo* pUdfInfo = taosArrayGet(pSql->cmd.pUdfInfo, -1 * pExpr->base.functionId - 1);
+      SUdfInfo* pUdfInfo = taosArrayGet(pQueryInfo->pUdfInfo, -1 * pExpr->base.functionId - 1);
       name = pUdfInfo->name;
     } else {
       name = aAggs[pExpr->base.functionId].name;
@@ -7034,7 +7033,7 @@ int32_t doCheckForStream(SSqlObj* pSql, SSqlInfo* pInfo) {
     return code;
   }
 
-  code = checkForUdf(pSql, pSqlNode->pSelNodeList);
+  code = checkForUdf(pSql, pQueryInfo, pSqlNode->pSelNodeList);
   if (code != TSDB_CODE_SUCCESS) {
     return code;
   }
@@ -7059,7 +7058,7 @@ int32_t doCheckForStream(SSqlObj* pSql, SSqlInfo* pInfo) {
     return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
   }
 
-  if (!tscIsProjectionQuery(pCmd, pQueryInfo) && pQueryInfo->interval.interval == 0) {
+  if (!tscIsProjectionQuery(pQueryInfo) && pQueryInfo->interval.interval == 0) {
     return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg7);
   }
 
@@ -7399,7 +7398,7 @@ int32_t validateHavingClause(SQueryInfo* pQueryInfo, tSqlExpr* pExpr, SSqlCmd* p
   }
 
   //REDO function check
-  if (!functionCompatibleCheck(pCmd, pQueryInfo, joinQuery, timeWindowQuery)) {
+  if (!functionCompatibleCheck(pQueryInfo, joinQuery, timeWindowQuery)) {
     return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
   }
 
@@ -7589,18 +7588,18 @@ int32_t validateSqlNode(SSqlObj* pSql, SSqlNode* pSqlNode, int32_t index) {
       TSDB_QUERY_SET_TYPE(pQueryInfo->type, TSDB_QUERY_TYPE_TABLE_QUERY);
     }
 
+    code = checkForUdf(pSql, pQueryInfo, pSqlNode->pSelNodeList);
+    if (code != TSDB_CODE_SUCCESS) {
+      return code;
+    }
+
     // parse the group by clause in the first place
     if (validateGroupbyNode(pQueryInfo, pSqlNode->pGroupby, pCmd) != TSDB_CODE_SUCCESS) {
       return TSDB_CODE_TSC_INVALID_SQL;
     }
 
-  code = checkForUdf(pSql, pSqlNode->pSelNodeList);
-  if (code != TSDB_CODE_SUCCESS) {
-    return code;
-  }
-
-  // set where info
-  STableComInfo tinfo = tscGetTableInfo(pTableMetaInfo->pTableMeta);
+    // set where info
+    STableComInfo tinfo = tscGetTableInfo(pTableMetaInfo->pTableMeta);
 
     if (pSqlNode->pWhere != NULL) {
       if (validateWhereNode(pQueryInfo, &pSqlNode->pWhere, pSql) != TSDB_CODE_SUCCESS) {
diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index 0920542af2b18426adf5fa757f09037e3e27dbc7..efbf87aa5340487eb50b683591831e8b6230d7e5 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -521,7 +521,7 @@ int tscBuildAndSendRequest(SSqlObj *pSql, SQueryInfo* pQueryInfo) {
     type = pQueryInfo->type;
 
     // while numOfTables equals to 0, it must be Heartbeat
-    assert((pQueryInfo->numOfTables == 0 && pQueryInfo->command == TSDB_SQL_HB) || pQueryInfo->numOfTables > 0);
+    assert((pQueryInfo->numOfTables == 0 && (pQueryInfo->command == TSDB_SQL_HB || pSql->cmd.command == TSDB_SQL_RETRIEVE_FUNC)) || pQueryInfo->numOfTables > 0);
   }
 
   tscDebug("0x%"PRIx64" SQL cmd:%s will be processed, name:%s, type:%d", pSql->self, sqlCmd[pCmd->command], name, type);
@@ -1026,10 +1026,10 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
   }
 
   // support only one udf
-  if (pCmd->pUdfInfo != NULL && taosArrayGetSize(pCmd->pUdfInfo) > 0) {
+  if (pQueryInfo->pUdfInfo != NULL && taosArrayGetSize(pQueryInfo->pUdfInfo) > 0) {
     pQueryMsg->udfContentOffset = htonl((int32_t) (pMsg - pCmd->payload));
-    for(int32_t i = 0; i < taosArrayGetSize(pCmd->pUdfInfo); ++i) {
-      SUdfInfo* pUdfInfo = taosArrayGet(pCmd->pUdfInfo, i);
+    for(int32_t i = 0; i < taosArrayGetSize(pQueryInfo->pUdfInfo); ++i) {
+      SUdfInfo* pUdfInfo = taosArrayGet(pQueryInfo->pUdfInfo, i);
       *(int8_t*) pMsg = pUdfInfo->resType;
       pMsg += sizeof(pUdfInfo->resType);
 
@@ -1843,14 +1843,15 @@ int tscBuildRetrieveFuncMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
   SSqlCmd *pCmd = &pSql->cmd;
 
   char *pMsg = pCmd->payload;
-  int32_t numOfFuncs = (int32_t)taosArrayGetSize(pCmd->pUdfInfo);
+  SQueryInfo* pQueryInfo = tscGetActiveQueryInfo(pCmd);
+  int32_t numOfFuncs = (int32_t)taosArrayGetSize(pQueryInfo->pUdfInfo);
 
   SRetrieveFuncMsg *pRetrieveFuncMsg = (SRetrieveFuncMsg *)pMsg;
   pRetrieveFuncMsg->num = htonl(numOfFuncs);
 
   pMsg += sizeof(SRetrieveFuncMsg);
   for(int32_t i = 0; i < numOfFuncs; ++i) {
-    SUdfInfo* pUdf = taosArrayGet(pCmd->pUdfInfo, i);
+    SUdfInfo* pUdf = taosArrayGet(pQueryInfo->pUdfInfo, i);
     STR_TO_NET_VARSTR(pMsg, pUdf->name);
     pMsg += varDataNetTLen(pMsg);
   }
@@ -2125,15 +2126,17 @@ int tscProcessMultiMeterMetaRsp(SSqlObj *pSql) {
 int tscProcessRetrieveFuncRsp(SSqlObj* pSql) {
   SSqlCmd* pCmd = &pSql->cmd;
   SUdfFuncMsg* pFuncMsg = (SUdfFuncMsg *)pSql->res.pRsp;
+  SQueryInfo* pQueryInfo = tscGetQueryInfo(pCmd, pCmd->clauseIndex);
+  
   pFuncMsg->num = htonl(pFuncMsg->num);
-  assert(pFuncMsg->num == taosArrayGetSize(pCmd->pUdfInfo));
+  assert(pFuncMsg->num == taosArrayGetSize(pQueryInfo->pUdfInfo));
 
   char* pMsg = pFuncMsg->content;
   for(int32_t i = 0; i < pFuncMsg->num; ++i) {
     SFunctionInfoMsg* pFunc = (SFunctionInfoMsg*) pMsg;
 
     for(int32_t j = 0; j < pFuncMsg->num; ++j) {
-      SUdfInfo* pUdfInfo = taosArrayGet(pCmd->pUdfInfo, j);
+      SUdfInfo* pUdfInfo = taosArrayGet(pQueryInfo->pUdfInfo, j);
       if (strcmp(pUdfInfo->name, pFunc->name) != 0) {
         continue;
       }
@@ -2161,11 +2164,13 @@ int tscProcessRetrieveFuncRsp(SSqlObj* pSql) {
     return pSql->res.code;
   }
 
+  SQueryInfo* parQueryInfo = tscGetQueryInfo(&parent->cmd, parent->cmd.clauseIndex);
+
   assert(parent->signature == parent && (int64_t)pSql->param == parent->self);
-  taosArrayDestroy(parent->cmd.pUdfInfo);
+  taosArrayDestroy(parQueryInfo->pUdfInfo);
 
-  parent->cmd.pUdfInfo = pCmd->pUdfInfo;   // assigned to parent sql obj.
-  pCmd->pUdfInfo = NULL;
+  parQueryInfo->pUdfInfo = pQueryInfo->pUdfInfo;   // assigned to parent sql obj.
+  pQueryInfo->pUdfInfo = NULL;
   return TSDB_CODE_SUCCESS;
 }
 
@@ -2479,7 +2484,7 @@ int tscProcessRetrieveRspFromNode(SSqlObj *pSql) {
     tscSetResRawPtr(pRes, pQueryInfo);
   } else if ((UTIL_TABLE_IS_CHILD_TABLE(pTableMetaInfo) || UTIL_TABLE_IS_NORMAL_TABLE(pTableMetaInfo)) && !TSDB_QUERY_HAS_TYPE(pQueryInfo->type, TSDB_QUERY_TYPE_SUBQUERY)) {
     tscSetResRawPtr(pRes, pQueryInfo);
-  } else if (tscNonOrderedProjectionQueryOnSTable(pCmd, pQueryInfo, 0) && !TSDB_QUERY_HAS_TYPE(pQueryInfo->type, TSDB_QUERY_TYPE_JOIN_QUERY) && !TSDB_QUERY_HAS_TYPE(pQueryInfo->type, TSDB_QUERY_TYPE_JOIN_SEC_STAGE)) {
+  } else if (tscNonOrderedProjectionQueryOnSTable(pQueryInfo, 0) && !TSDB_QUERY_HAS_TYPE(pQueryInfo->type, TSDB_QUERY_TYPE_JOIN_QUERY) && !TSDB_QUERY_HAS_TYPE(pQueryInfo->type, TSDB_QUERY_TYPE_JOIN_SEC_STAGE)) {
     tscSetResRawPtr(pRes, pQueryInfo);
   }
 
@@ -2607,7 +2612,7 @@ int tscGetTableMetaEx(SSqlObj *pSql, STableMetaInfo *pTableMetaInfo, bool create
   return tscGetTableMeta(pSql, pTableMetaInfo);
 }
 
-int32_t tscGetUdfFromNode(SSqlObj *pSql) {
+int32_t tscGetUdfFromNode(SSqlObj *pSql, SQueryInfo* pQueryInfo) {
   SSqlObj *pNew = calloc(1, sizeof(SSqlObj));
   if (NULL == pNew) {
     tscError("%p malloc failed for new sqlobj to get user-defined functions", pSql);
@@ -2618,14 +2623,24 @@ int32_t tscGetUdfFromNode(SSqlObj *pSql) {
   pNew->signature = pNew;
   pNew->cmd.command = TSDB_SQL_RETRIEVE_FUNC;
 
-  pNew->cmd.pUdfInfo = taosArrayInit(4, sizeof(SUdfInfo));
-  for(int32_t i = 0; i < taosArrayGetSize(pSql->cmd.pUdfInfo); ++i) {
+  if (tscAddQueryInfo(&pNew->cmd) != TSDB_CODE_SUCCESS) {
+    tscError("%p malloc failed for new queryinfo", pSql);
+    tscFreeSqlObj(pNew);
+    return TSDB_CODE_TSC_OUT_OF_MEMORY;
+  }
+
+  SQueryInfo *pNewQueryInfo = tscGetQueryInfo(&pNew->cmd, 0);
+
+  pNewQueryInfo->pUdfInfo = taosArrayInit(4, sizeof(SUdfInfo));
+  for(int32_t i = 0; i < taosArrayGetSize(pQueryInfo->pUdfInfo); ++i) {
     SUdfInfo info = {0};
-    SUdfInfo* p1 = taosArrayGet(pSql->cmd.pUdfInfo, i);
+    SUdfInfo* p1 = taosArrayGet(pQueryInfo->pUdfInfo, i);
     info = *p1;
     info.name = strdup(p1->name);
-    taosArrayPush(pNew->cmd.pUdfInfo, &info);
+    taosArrayPush(pNewQueryInfo->pUdfInfo, &info);
   }
+  
+  pNew->cmd.active = pNewQueryInfo;
 
   if (TSDB_CODE_SUCCESS != tscAllocPayload(&pNew->cmd, TSDB_DEFAULT_PAYLOAD_SIZE + pSql->cmd.payloadLen)) {
     tscError("%p malloc failed for payload to get table meta", pSql);
diff --git a/src/client/src/tscSubquery.c b/src/client/src/tscSubquery.c
index d0c59525aa31e9987dd4948df7fe7bbe6c115822..4db9cf7bc22c69ccf326e18e4f6c5405786f9c13 100644
--- a/src/client/src/tscSubquery.c
+++ b/src/client/src/tscSubquery.c
@@ -615,7 +615,7 @@ static int32_t tscLaunchRealSubqueries(SSqlObj* pSql) {
     if ((pExpr->base.colInfo.colId != PRIMARYKEY_TIMESTAMP_COL_INDEX) ||
         (funcId != TSDB_FUNC_TS && funcId != TSDB_FUNC_TS_DUMMY && funcId != TSDB_FUNC_PRJ)) {
 
-      int16_t functionId = tscIsProjectionQuery(&pNew->cmd, pQueryInfo)? TSDB_FUNC_PRJ : TSDB_FUNC_TS;
+      int16_t functionId = tscIsProjectionQuery(pQueryInfo)? TSDB_FUNC_PRJ : TSDB_FUNC_TS;
 
       tscAddFuncInSelectClause(pQueryInfo, 0, functionId, &index, s, TSDB_COL_NORMAL);
       tscPrintSelNodeList(pNew, 0);
@@ -636,7 +636,7 @@ static int32_t tscLaunchRealSubqueries(SSqlObj* pSql) {
 
     if (UTIL_TABLE_IS_SUPER_TABLE(pTableMetaInfo)) {
       assert(pTableMetaInfo->pVgroupTables != NULL);
-      if (tscNonOrderedProjectionQueryOnSTable(&pNew->cmd, pQueryInfo, 0)) {
+      if (tscNonOrderedProjectionQueryOnSTable(pQueryInfo, 0)) {
         SArray* p = buildVgroupTableByResult(pQueryInfo, pTableMetaInfo->pVgroupTables);
         tscFreeVgroupTableInfo(pTableMetaInfo->pVgroupTables);
         pTableMetaInfo->pVgroupTables = p;
@@ -1429,7 +1429,7 @@ static void joinRetrieveFinalResCallback(void* param, TAOS_RES* tres, int numOfR
   }
 
   SSubqueryState* pState = &pParentSql->subState;
-  if (tscNonOrderedProjectionQueryOnSTable(pCmd, pQueryInfo, 0) && numOfRows == 0) {
+  if (tscNonOrderedProjectionQueryOnSTable(pQueryInfo, 0) && numOfRows == 0) {
     STableMetaInfo* pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
     assert(pQueryInfo->numOfTables == 1);
 
@@ -1561,7 +1561,7 @@ void tscFetchDatablockForSubquery(SSqlObj* pSql) {
       }
 
       SQueryInfo* p = tscGetQueryInfo(&pSub->cmd, 0);
-      orderedPrjQuery = tscNonOrderedProjectionQueryOnSTable(&pSub->cmd, p, 0);
+      orderedPrjQuery = tscNonOrderedProjectionQueryOnSTable(p, 0);
       if (orderedPrjQuery) {
         break;
       }
@@ -1586,7 +1586,7 @@ void tscFetchDatablockForSubquery(SSqlObj* pSql) {
 
       SQueryInfo* pQueryInfo = tscGetQueryInfo(&pSub->cmd, 0);
 
-      if (tscNonOrderedProjectionQueryOnSTable(&pSub->cmd, pQueryInfo, 0) && pSub->res.row >= pSub->res.numOfRows &&
+      if (tscNonOrderedProjectionQueryOnSTable(pQueryInfo, 0) && pSub->res.row >= pSub->res.numOfRows &&
           pSub->res.completed) {
         STableMetaInfo* pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
         assert(pQueryInfo->numOfTables == 1);
@@ -1788,7 +1788,7 @@ void tscJoinQueryCallback(void* param, TAOS_RES* tres, int code) {
   }
 
   // In case of consequence query from other vnode, do not wait for other query response here.
-  if (!(pTableMetaInfo->vgroupIndex > 0 && tscNonOrderedProjectionQueryOnSTable(&pSql->cmd, pQueryInfo, 0))) {
+  if (!(pTableMetaInfo->vgroupIndex > 0 && tscNonOrderedProjectionQueryOnSTable(pQueryInfo, 0))) {
     if (!subAndCheckDone(pSql, pParentSql, pSupporter->subqueryIndex)) {
       return;
     }      
@@ -1800,7 +1800,7 @@ void tscJoinQueryCallback(void* param, TAOS_RES* tres, int code) {
    * if the query is a continue query (vgroupIndex > 0 for projection query) for next vnode, do the retrieval of
    * data instead of returning to its invoker
    */
-  if (pTableMetaInfo->vgroupIndex > 0 && tscNonOrderedProjectionQueryOnSTable(&pSql->cmd, pQueryInfo, 0)) {
+  if (pTableMetaInfo->vgroupIndex > 0 && tscNonOrderedProjectionQueryOnSTable(pQueryInfo, 0)) {
     pSql->fp = joinRetrieveFinalResCallback;  // continue retrieve data
     pSql->cmd.command = TSDB_SQL_FETCH;
     
@@ -2773,6 +2773,8 @@ static void tscAllDataRetrievedFromDnode(SRetrieveSupport *trsupport, SSqlObj* p
   // set the command flag must be after the semaphore been correctly set.
   if (pParentSql->cmd.command != TSDB_SQL_RETRIEVE_EMPTY_RESULT) {
     pParentSql->cmd.command = TSDB_SQL_RETRIEVE_LOCALMERGE;
+    
+    SQueryInfo *pQueryInfo2 = tscGetQueryInfo(&pParentSql->cmd, pParentSql->cmd.clauseIndex);
 
     size_t size = tscSqlExprNumOfExprs(pQueryInfo);
     for (int32_t j = 0; j < size; ++j) {
@@ -2781,7 +2783,7 @@ static void tscAllDataRetrievedFromDnode(SRetrieveSupport *trsupport, SSqlObj* p
       int32_t functionId = pCtx->functionId;
 
       if (functionId < 0) {
-        SUdfInfo* pUdfInfo = taosArrayGet(pParentSql->cmd.pUdfInfo, -1 * functionId - 1);
+        SUdfInfo* pUdfInfo = taosArrayGet(pQueryInfo2->pUdfInfo, -1 * functionId - 1);
         code = initUdfInfo(pUdfInfo);
         if (code != TSDB_CODE_SUCCESS) {
           pParentSql->res.code = code;
@@ -2862,8 +2864,7 @@ static void tscRetrieveFromDnodeCallBack(void *param, TAOS_RES *tres, int numOfR
     tscDebug("0x%"PRIx64" sub:%p retrieve numOfRows:%d totalNumOfRows:%" PRIu64 " from ep:%s, orderOfSub:%d",
         pParentSql->self, pSql, pRes->numOfRows, pState->numOfRetrievedRows, pSql->epSet.fqdn[pSql->epSet.inUse], idx);
 
-    SSqlCmd* pCmd = &pSql->cmd;
-    if (num > tsMaxNumOfOrderedResults && tscIsProjectionQueryOnSTable(pCmd, pQueryInfo, 0)) {
+    if (num > tsMaxNumOfOrderedResults && tscIsProjectionQueryOnSTable(pQueryInfo, 0)) {
       tscError("%p sub:%p num of OrderedRes is too many, max allowed:%" PRId32 " , current:%" PRId64,
                pParentSql, pSql, tsMaxNumOfOrderedResults, num);
       tscAbortFurtherRetryRetrieval(trsupport, tres, TSDB_CODE_TSC_SORTED_RES_TOO_MANY);
diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index 7e0aad3b4402cd3205b9330032872a057deffa13..06a8b91177a12a17fc3127e77537d69a750c2bb1 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -127,7 +127,7 @@ bool tscIsTwoStageSTableQuery(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, int32_t tab
   }
 
   // for ordered projection query, iterate all qualified vnodes sequentially
-  if (tscNonOrderedProjectionQueryOnSTable(pCmd, pQueryInfo, tableIndex)) {
+  if (tscNonOrderedProjectionQueryOnSTable(pQueryInfo, tableIndex)) {
     return false;
   }
 
@@ -138,7 +138,7 @@ bool tscIsTwoStageSTableQuery(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, int32_t tab
   return false;
 }
 
-bool tscIsProjectionQueryOnSTable(SSqlCmd *pCmd, SQueryInfo* pQueryInfo, int32_t tableIndex) {
+bool tscIsProjectionQueryOnSTable(SQueryInfo* pQueryInfo, int32_t tableIndex) {
   STableMetaInfo* pTableMetaInfo = tscGetMetaInfo(pQueryInfo, tableIndex);
   
   /*
@@ -156,7 +156,7 @@ bool tscIsProjectionQueryOnSTable(SSqlCmd *pCmd, SQueryInfo* pQueryInfo, int32_t
     int32_t functionId = tscSqlExprGet(pQueryInfo, i)->base.functionId;
 
     if (functionId < 0) {
-      SUdfInfo* pUdfInfo = taosArrayGet(pCmd->pUdfInfo, -1 * functionId - 1);
+      SUdfInfo* pUdfInfo = taosArrayGet(pQueryInfo->pUdfInfo, -1 * functionId - 1);
       if (pUdfInfo->funcType == TSDB_UDF_TYPE_AGGREGATE) {
         return false;
       }
@@ -179,8 +179,8 @@ bool tscIsProjectionQueryOnSTable(SSqlCmd *pCmd, SQueryInfo* pQueryInfo, int32_t
 }
 
 // not order by timestamp projection query on super table
-bool tscNonOrderedProjectionQueryOnSTable(SSqlCmd *pCmd, SQueryInfo* pQueryInfo, int32_t tableIndex) {
-  if (!tscIsProjectionQueryOnSTable(pCmd, pQueryInfo, tableIndex)) {
+bool tscNonOrderedProjectionQueryOnSTable(SQueryInfo* pQueryInfo, int32_t tableIndex) {
+  if (!tscIsProjectionQueryOnSTable(pQueryInfo, tableIndex)) {
     return false;
   }
   
@@ -188,8 +188,8 @@ bool tscNonOrderedProjectionQueryOnSTable(SSqlCmd *pCmd, SQueryInfo* pQueryInfo,
   return pQueryInfo->order.orderColId < 0;
 }
 
-bool tscOrderedProjectionQueryOnSTable(SSqlCmd *pCmd, SQueryInfo* pQueryInfo, int32_t tableIndex) {
-  if (!tscIsProjectionQueryOnSTable(pCmd, pQueryInfo, tableIndex)) {
+bool tscOrderedProjectionQueryOnSTable(SQueryInfo* pQueryInfo, int32_t tableIndex) {
+  if (!tscIsProjectionQueryOnSTable(pQueryInfo, tableIndex)) {
     return false;
   }
   
@@ -197,14 +197,14 @@ bool tscOrderedProjectionQueryOnSTable(SSqlCmd *pCmd, SQueryInfo* pQueryInfo, in
   return pQueryInfo->order.orderColId >= 0;
 }
 
-bool tscIsProjectionQuery(SSqlCmd* pCmd, SQueryInfo* pQueryInfo) {
+bool tscIsProjectionQuery(SQueryInfo* pQueryInfo) {
   size_t size = tscSqlExprNumOfExprs(pQueryInfo);
 
   for (int32_t i = 0; i < size; ++i) {
     int32_t functionId = tscSqlExprGet(pQueryInfo, i)->base.functionId;
 
     if (functionId < 0) {
-      SUdfInfo* pUdfInfo = taosArrayGet(pCmd->pUdfInfo, -1 * functionId - 1);
+      SUdfInfo* pUdfInfo = taosArrayGet(pQueryInfo->pUdfInfo, -1 * functionId - 1);
       if (pUdfInfo->funcType == TSDB_UDF_TYPE_AGGREGATE) {
         return false;
       }
@@ -249,7 +249,7 @@ bool tscIsSecondStageQuery(SSqlCmd* pCmd, SQueryInfo* pQueryInfo) {
     }
   }
 
-  if (tscIsProjectionQuery(pCmd, pQueryInfo)) {
+  if (tscIsProjectionQuery(pQueryInfo)) {
     return false;
   }
 
@@ -422,6 +422,15 @@ bool isSimpleAggregate(SQueryInfo* pQueryInfo) {
     }
 
     int32_t functionId = pExpr->base.functionId;
+    if (functionId < 0) {
+      SUdfInfo* pUdfInfo = taosArrayGet(pQueryInfo->pUdfInfo, -1 * functionId - 1);
+      if (pUdfInfo->funcType == TSDB_UDF_TYPE_AGGREGATE) {
+        return true;
+      }
+
+      continue;
+    }
+    
     if (functionId == TSDB_FUNC_TS || functionId == TSDB_FUNC_TS_DUMMY) {
       continue;
     }
@@ -799,6 +808,12 @@ void tscFreeQueryInfo(SSqlCmd* pCmd, bool removeMeta) {
 
       tfree(pUp);
     }
+
+    if (pCmd->subCmd) {
+      pQueryInfo->pUdfInfo = taosArrayDestroy(pQueryInfo->pUdfInfo);
+    } else {
+      pQueryInfo->pUdfInfo = tscDestroyUdfArrayList(pQueryInfo->pUdfInfo);
+    }
     
     freeQueryInfoImpl(pQueryInfo);
     clearAllTableMetaInfo(pQueryInfo, removeMeta);
@@ -842,11 +857,6 @@ void tscResetSqlCmd(SSqlCmd* pCmd, bool removeMeta) {
 
   pCmd->pTableBlockHashList = tscDestroyBlockHashTable(pCmd->pTableBlockHashList, removeMeta);
   pCmd->pDataBlocks = tscDestroyBlockArrayList(pCmd->pDataBlocks);
-  if (pCmd->subCmd) {
-    pCmd->pUdfInfo = taosArrayDestroy(pCmd->pUdfInfo);
-  } else {
-    pCmd->pUdfInfo = tscDestroyUdfArrayList(pCmd->pUdfInfo);
-  }
   tscFreeQueryInfo(pCmd, removeMeta);
 }
 
@@ -2683,12 +2693,13 @@ SSqlObj* createSubqueryObj(SSqlObj* pSql, int16_t tableIndex, __async_cb_func_t
     goto _error;
   }
 
-  if (pCmd->pUdfInfo) {
-    pnCmd->pUdfInfo = taosArrayDup(pCmd->pUdfInfo);
-  }
 
   SQueryInfo* pNewQueryInfo = tscGetQueryInfo(pnCmd, 0);
 
+  if (pQueryInfo->pUdfInfo) {
+    pNewQueryInfo->pUdfInfo = taosArrayDup(pQueryInfo->pUdfInfo);
+  }
+
   pNewQueryInfo->command = pQueryInfo->command;
   pnCmd->active = pNewQueryInfo;
 
@@ -3096,7 +3107,7 @@ bool hasMoreVnodesToTry(SSqlObj* pSql) {
     numOfVgroups = (int32_t)taosArrayGetSize(pTableMetaInfo->pVgroupTables);
   }
 
-  return tscNonOrderedProjectionQueryOnSTable(pCmd, pQueryInfo, 0) &&
+  return tscNonOrderedProjectionQueryOnSTable(pQueryInfo, 0) &&
          (!tscHasReachLimitation(pQueryInfo, pRes)) && (pTableMetaInfo->vgroupIndex < numOfVgroups - 1);
 }
 
@@ -3114,7 +3125,7 @@ void tscTryQueryNextVnode(SSqlObj* pSql, __async_cb_func_t fp) {
    * no result returned from the current virtual node anymore, try the next vnode if exists
    * if case of: multi-vnode super table projection query
    */
-  assert(pRes->numOfRows == 0 && tscNonOrderedProjectionQueryOnSTable(pCmd, pQueryInfo, 0) && !tscHasReachLimitation(pQueryInfo, pRes));
+  assert(pRes->numOfRows == 0 && tscNonOrderedProjectionQueryOnSTable(pQueryInfo, 0) && !tscHasReachLimitation(pQueryInfo, pRes));
   STableMetaInfo* pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
   
   int32_t totalVgroups = pTableMetaInfo->vgroupList->numOfVgroups;
@@ -3489,9 +3500,15 @@ static int32_t createSecondaryExpr(SQueryAttr* pQueryAttr, SQueryInfo* pQueryInf
         functionId = TSDB_FUNC_STDDEV;
       }
 
+      SUdfInfo* pUdfInfo = NULL;
+      
+      if (functionId < 0) {
+        pUdfInfo = taosArrayGet(pQueryInfo->pUdfInfo, -1 * functionId - 1);
+      }
+
       int32_t inter = 0;
       getResultDataInfo(pExpr->base.colType, pExpr->base.colBytes, functionId, 0, &pse->resType,
-          &pse->resBytes, &inter, 0, false, NULL);
+          &pse->resBytes, &inter, 0, false, pUdfInfo);
       pse->colType  = pse->resType;
       pse->colBytes = pse->resBytes;
 
@@ -3558,8 +3575,14 @@ static int32_t createGlobalAggregateExpr(SQueryAttr* pQueryAttr, SQueryInfo* pQu
         functionId = TSDB_FUNC_STDDEV;
       }
 
+      SUdfInfo* pUdfInfo = NULL;
+      
+      if (functionId < 0) {
+        pUdfInfo = taosArrayGet(pQueryInfo->pUdfInfo, -1 * functionId - 1);
+      }
+
       getResultDataInfo(pExpr->base.colType, pExpr->base.colBytes, functionId, 0, &pse->resType, &pse->resBytes, &inter,
-                        0, false, NULL);
+                        0, false, pUdfInfo);
     }
   }
 
@@ -3633,7 +3656,8 @@ int32_t tscCreateQueryFromQueryInfo(SQueryInfo* pQueryInfo, SQueryAttr* pQueryAt
   pQueryAttr->fillType          = pQueryInfo->fillType;
   pQueryAttr->groupbyColumn     = tscGroupbyColumn(pQueryInfo);
   pQueryAttr->havingNum         = pQueryInfo->havingFieldNum;
-
+  pQueryAttr->pUdfInfo          = pQueryInfo->pUdfInfo;
+    
   if (pQueryInfo->order.order == TSDB_ORDER_ASC) {   // TODO refactor
     pQueryAttr->window = pQueryInfo->window;
   } else {
diff --git a/src/query/inc/qExecutor.h b/src/query/inc/qExecutor.h
index 821305c607c6a9a4e1048910c9781a1b31e2b5f4..59ad2adea101c23a909c4691298fddd98048c953 100644
--- a/src/query/inc/qExecutor.h
+++ b/src/query/inc/qExecutor.h
@@ -236,6 +236,7 @@ typedef struct SQueryAttr {
   SMemRef          memRef;
   STableGroupInfo  tableGroupInfo;       // table <tid, last_key> list  SArray<STableKeyInfo>
   int32_t          vgId;
+  SArray          *pUdfInfo;             // no need to free
 } SQueryAttr;
 
 typedef SSDataBlock* (*__operator_fn_t)(void* param, bool* newgroup);
@@ -495,6 +496,7 @@ typedef struct SMultiwayMergeInfo {
 
   bool                 hasPrev;
   bool                 groupMix;
+  SArray              *udfInfo;  
 } SMultiwayMergeInfo;
 
 SOperatorInfo* createDataBlocksOptScanInfo(void* pTsdbQueryHandle, SQueryRuntimeEnv* pRuntimeEnv, int32_t repeatTime, int32_t reverseTime);
@@ -515,7 +517,7 @@ SOperatorInfo* createDistinctOperatorInfo(SQueryRuntimeEnv* pRuntimeEnv, SOperat
 SOperatorInfo* createTableBlockInfoScanOperator(void* pTsdbQueryHandle, SQueryRuntimeEnv* pRuntimeEnv);
 SOperatorInfo* createMultiwaySortOperatorInfo(SQueryRuntimeEnv* pRuntimeEnv, SExprInfo* pExpr, int32_t numOfOutput,
                                               int32_t numOfRows, void* merger, bool groupMix);
-SOperatorInfo* createGlobalAggregateOperatorInfo(SQueryRuntimeEnv* pRuntimeEnv, SOperatorInfo* upstream, SExprInfo* pExpr, int32_t numOfOutput, void* param);
+SOperatorInfo* createGlobalAggregateOperatorInfo(SQueryRuntimeEnv* pRuntimeEnv, SOperatorInfo* upstream, SExprInfo* pExpr, int32_t numOfOutput, void* param, SArray* pUdfInfo);
 SOperatorInfo* createSLimitOperatorInfo(SQueryRuntimeEnv* pRuntimeEnv, SOperatorInfo* upstream, SExprInfo* pExpr, int32_t numOfOutput, void* merger);
 SOperatorInfo* createFilterOperatorInfo(SQueryRuntimeEnv* pRuntimeEnv, SOperatorInfo* upstream, SExprInfo* pExpr, int32_t numOfOutput);
 
@@ -530,6 +532,7 @@ void setInputDataBlock(SOperatorInfo* pOperator, SQLFunctionCtx* pCtx, SSDataBlo
 int32_t getNumOfResult(SQueryRuntimeEnv *pRuntimeEnv, SQLFunctionCtx* pCtx, int32_t numOfOutput);
 void finalizeQueryResult(SOperatorInfo* pOperator, SQLFunctionCtx* pCtx, SResultRowInfo* pResultRowInfo, int32_t* rowCellInfoOffset);
 void updateOutputBuf(SOptrBasicInfo* pBInfo, int32_t *bufCapacity, int32_t numOfInputRows);
+void clearOutputBuf(SOptrBasicInfo* pBInfo, int32_t *bufCapacity);
 
 void freeParam(SQueryParam *param);
 int32_t convertQueryMsg(SQueryTableMsg *pQueryMsg, SQueryParam* param);
@@ -571,4 +574,6 @@ void freeQueryAttr(SQueryAttr *pQuery);
 
 int32_t getMaximumIdleDurationSec();
 
+void doInvokeUdf(SUdfInfo* pUdfInfo, SQLFunctionCtx *pCtx, int32_t idx, int32_t type);
+
 #endif  // TDENGINE_QEXECUTOR_H
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 3092a29e96f51b19671361c7c95e971bfe1c9564..24a0a2394c999d90838b8677f89f1d8b09d8ec81 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -701,39 +701,72 @@ static int32_t getNumOfRowsInTimeWindow(SQueryRuntimeEnv* pRuntimeEnv, SDataBloc
   return num;
 }
 
-static void doInvokeUdf(SQueryRuntimeEnv *pRuntimeEnv, SQLFunctionCtx *pCtx, int32_t idx) {
+void doInvokeUdf(SUdfInfo* pUdfInfo, SQLFunctionCtx *pCtx, int32_t idx, int32_t type) {
   int32_t output = 0;
-  SUdfInfo* pUdfInfo = pRuntimeEnv->pUdfInfo;
 
-  if (pUdfInfo && pUdfInfo->funcs[TSDB_UDF_FUNC_NORMAL]) {
-    qDebug("invoke udf function:%s,%p", pUdfInfo->name, pUdfInfo->funcs[TSDB_UDF_FUNC_NORMAL]);
-    if (pUdfInfo->isScript) {
-      (*(scriptNormalFunc)pUdfInfo->funcs[TSDB_UDF_FUNC_NORMAL])(pUdfInfo->pScriptCtx,
-                   (char *)pCtx->pInput + idx * pCtx->inputType, pCtx->inputType, pCtx->inputBytes, pCtx->size, pCtx->ptsList, pCtx->pOutput,
-                  (char *)pCtx->ptsOutputBuf, &output, pCtx->outputType, pCtx->outputBytes);
-    } else {
-      SResultRowCellInfo *pResInfo = GET_RES_INFO(pCtx);
+  if (pUdfInfo == NULL || pUdfInfo->funcs[type] == NULL) {
+    qError("empty udf function, type:%d", type);
+    return;
+  }
 
-      void *interBuf = (void *)GET_ROWCELL_INTERBUF(pResInfo);
+  qDebug("invoke udf function:%s,%p", pUdfInfo->name, pUdfInfo->funcs[type]);
 
-      (*(udfNormalFunc)pUdfInfo->funcs[TSDB_UDF_FUNC_NORMAL])((char *)pCtx->pInput + idx * pCtx->inputType, pCtx->inputType, pCtx->inputBytes, pCtx->size, pCtx->ptsList,
-        pCtx->pOutput, interBuf, (char *)pCtx->ptsOutputBuf, &output, pCtx->outputType, pCtx->outputBytes, &pUdfInfo->init);
-    }
+  switch (type) {
+    case TSDB_UDF_FUNC_NORMAL:
+      if (pUdfInfo->isScript) {
+        (*(scriptNormalFunc)pUdfInfo->funcs[TSDB_UDF_FUNC_NORMAL])(pUdfInfo->pScriptCtx,
+                     (char *)pCtx->pInput + idx * pCtx->inputType, pCtx->inputType, pCtx->inputBytes, pCtx->size, pCtx->ptsList, pCtx->pOutput,
+                    (char *)pCtx->ptsOutputBuf, &output, pCtx->outputType, pCtx->outputBytes);
+      } else {
+        SResultRowCellInfo *pResInfo = GET_RES_INFO(pCtx);
 
-    if (pUdfInfo->funcType == TSDB_UDF_TYPE_AGGREGATE) {
+        void *interBuf = (void *)GET_ROWCELL_INTERBUF(pResInfo);
+
+        (*(udfNormalFunc)pUdfInfo->funcs[TSDB_UDF_FUNC_NORMAL])((char *)pCtx->pInput + idx * pCtx->inputType, pCtx->inputType, pCtx->inputBytes, pCtx->size, pCtx->ptsList,
+          pCtx->pOutput, interBuf, (char *)pCtx->ptsOutputBuf, &output, pCtx->outputType, pCtx->outputBytes, &pUdfInfo->init);
+      }
+
+      if (pUdfInfo->funcType == TSDB_UDF_TYPE_AGGREGATE) {
+        pCtx->resultInfo->numOfRes = output;
+      } else {
+        pCtx->resultInfo->numOfRes += output;
+      }
+
+      if (pCtx->resultInfo->numOfRes > 0) {
+        pCtx->resultInfo->hasResult = DATA_SET_FLAG;
+      }
+
+      break;
+
+    case TSDB_UDF_FUNC_MERGE:
+      (*(udfMergeFunc)pUdfInfo->funcs[TSDB_UDF_FUNC_MERGE])(pCtx->pInput, pCtx->size, pCtx->pOutput, &output, &pUdfInfo->init);
+      
+      // set the output value exist
       pCtx->resultInfo->numOfRes = output;
-    } else {
-      pCtx->resultInfo->numOfRes += output;
-    }
+      if (output > 0) {
+        pCtx->resultInfo->hasResult = DATA_SET_FLAG;
+      }
 
-    if (pCtx->resultInfo->numOfRes > 0) {
-      pCtx->resultInfo->hasResult = DATA_SET_FLAG;
-    }
+      break;
 
-    return;
+    case TSDB_UDF_FUNC_FINALIZE: {
+      SResultRowCellInfo *pResInfo = GET_RES_INFO(pCtx);
+      void *interBuf = (void *)GET_ROWCELL_INTERBUF(pResInfo);
+      if (pUdfInfo->isScript) {
+        (*(scriptFinalizeFunc)pUdfInfo->funcs[TSDB_UDF_FUNC_FINALIZE])(pUdfInfo->pScriptCtx, pCtx->pOutput, &output);
+      } else {    
+        (*(udfFinalizeFunc)pUdfInfo->funcs[TSDB_UDF_FUNC_FINALIZE])(pCtx->pOutput, interBuf, &output, &pUdfInfo->init);
+      }
+      // set the output value exist
+      pCtx->resultInfo->numOfRes = output;
+      if (output > 0) {
+        pCtx->resultInfo->hasResult = DATA_SET_FLAG;
+      }
+
+      break;
+      }
   }
 
-  qError("empty udf function");
   return;
 }
 
@@ -768,7 +801,8 @@ static void doApplyFunctions(SQueryRuntimeEnv* pRuntimeEnv, SQLFunctionCtx* pCtx
     if (functionNeedToExecute(pRuntimeEnv, &pCtx[k], functionId)) {
 //      aAggs[functionId].xFunction(&pCtx[k]);
       if (functionId < 0) { // load the script and exec, pRuntimeEnv->pUdfInfo
-        doInvokeUdf(pRuntimeEnv, &pCtx[k], 0);
+        SUdfInfo* pUdfInfo = pRuntimeEnv->pUdfInfo;              
+        doInvokeUdf(pUdfInfo, &pCtx[k], 0, TSDB_UDF_FUNC_NORMAL);
       } else {
         aAggs[functionId].xFunction(&pCtx[k]);
       }
@@ -982,6 +1016,13 @@ static void doSetInputDataBlock(SOperatorInfo* pOperator, SQLFunctionCtx* pCtx,
         pCtx[i].pInput = p->pData;
         assert(p->info.colId == pColIndex->colId && pCtx[i].inputType == p->info.type);
 
+        if (pCtx[i].functionId < 0) {
+          SColumnInfoData* tsInfo = taosArrayGet(pBlock->pDataBlock, 0);
+          pCtx[i].ptsList = (int64_t*) tsInfo->pData;            
+
+          continue;
+        }
+
         uint32_t status = aAggs[pCtx[i].functionId].status;
         if ((status & (TSDB_FUNCSTATE_SELECTIVITY | TSDB_FUNCSTATE_NEED_TS)) != 0) {
           SColumnInfoData* tsInfo = taosArrayGet(pBlock->pDataBlock, 0);
@@ -1011,7 +1052,8 @@ static void doAggregateImpl(SOperatorInfo* pOperator, TSKEY startTs, SQLFunction
       pCtx[k].startTs = startTs;// this can be set during create the struct
 //      aAggs[functionId].xFunction(&pCtx[k]);
       if (functionId < 0) {
-        doInvokeUdf(pRuntimeEnv, &pCtx[k], 0);
+        SUdfInfo* pUdfInfo = pRuntimeEnv->pUdfInfo;        
+        doInvokeUdf(pUdfInfo, &pCtx[k], 0, TSDB_UDF_FUNC_NORMAL);
       } else {
         aAggs[functionId].xFunction(&pCtx[k]);
       }
@@ -1033,8 +1075,9 @@ static void arithmeticApplyFunctions(SQueryRuntimeEnv *pRuntimeEnv, SQLFunctionC
     pCtx[k].startTs = pQueryAttr->window.skey;
 
     if (pCtx[k].functionId < 0) {
-      // load the script and exec
-      doInvokeUdf(pRuntimeEnv, &pCtx[k], 0);
+      // load the script and exec      
+      SUdfInfo* pUdfInfo = pRuntimeEnv->pUdfInfo;
+      doInvokeUdf(pUdfInfo, &pCtx[k], 0, TSDB_UDF_FUNC_NORMAL);
     } else {
       aAggs[pCtx[k].functionId].xFunction(&pCtx[k]);
     }
@@ -1359,7 +1402,8 @@ static void doHashGroupbyAgg(SOperatorInfo* pOperator, SGroupbyOperatorInfo *pIn
       pInfo->binfo.pCtx[k].size = 1;
       int32_t functionId = pInfo->binfo.pCtx[k].functionId;
       if (functionId < 0) {
-        doInvokeUdf(pRuntimeEnv, &pInfo->binfo.pCtx[k], j);
+        SUdfInfo* pUdfInfo = pRuntimeEnv->pUdfInfo;                      
+        doInvokeUdf(pUdfInfo, &pInfo->binfo.pCtx[k], j, TSDB_UDF_FUNC_NORMAL);
       } else if (functionNeedToExecute(pRuntimeEnv, &pInfo->binfo.pCtx[k], functionId)) {
         aAggs[functionId].xFunctionF(&pInfo->binfo.pCtx[k], j);
       }
@@ -1848,7 +1892,7 @@ static int32_t setupQueryRuntimeEnv(SQueryRuntimeEnv *pRuntimeEnv, int32_t numOf
 
       case OP_GlobalAggregate: {
         pRuntimeEnv->proot = createGlobalAggregateOperatorInfo(pRuntimeEnv, pRuntimeEnv->proot, pQueryAttr->pExpr3,
-                                                               pQueryAttr->numOfExpr3, merger);
+                                                               pQueryAttr->numOfExpr3, merger, pQueryAttr->pUdfInfo);
         break;
       }
 
@@ -3154,6 +3198,21 @@ void updateOutputBuf(SOptrBasicInfo* pBInfo, int32_t *bufCapacity, int32_t numOf
   }
 }
 
+void clearOutputBuf(SOptrBasicInfo* pBInfo, int32_t *bufCapacity) {
+  SSDataBlock* pDataBlock = pBInfo->pRes;
+
+  for (int32_t i = 0; i < pDataBlock->info.numOfCols; ++i) {
+    SColumnInfoData *pColInfo = taosArrayGet(pDataBlock->pDataBlock, i);
+
+    int32_t functionId = pBInfo->pCtx[i].functionId;
+    if (functionId < 0) {
+      memset(pBInfo->pCtx[i].pOutput, 0, pColInfo->info.bytes * (*bufCapacity));
+    }
+  }
+}
+
+
+
 void initCtxOutputBuffer(SQLFunctionCtx* pCtx, int32_t size) {
   for (int32_t j = 0; j < size; ++j) {
     SResultRowCellInfo* pResInfo = GET_RES_INFO(&pCtx[j]);
@@ -3221,23 +3280,7 @@ void finalizeQueryResult(SOperatorInfo* pOperator, SQLFunctionCtx* pCtx, SResult
 
       for (int32_t j = 0; j < numOfOutput; ++j) {
         if (pCtx[j].functionId < 0) {
-          int32_t output = 0;
-          SResultRowCellInfo *pResInfo = GET_RES_INFO(&pCtx[j]);
-          void *interBuf = (void *)GET_ROWCELL_INTERBUF(pResInfo);
-
-          if (pRuntimeEnv->pUdfInfo && pRuntimeEnv->pUdfInfo->funcs[TSDB_UDF_FUNC_FINALIZE]) {
-            if (pRuntimeEnv->pUdfInfo->isScript) {
-              (*(scriptFinalizeFunc)pRuntimeEnv->pUdfInfo->funcs[TSDB_UDF_FUNC_FINALIZE])(pRuntimeEnv->pUdfInfo->pScriptCtx, pCtx[j].pOutput, &output);
-            } else {
-              (*(udfFinalizeFunc)pRuntimeEnv->pUdfInfo->funcs[TSDB_UDF_FUNC_FINALIZE])(pCtx[j].pOutput, interBuf, &output, &pRuntimeEnv->pUdfInfo->init);
-            }
-          }
-
-          // set the output value exist
-          pCtx[j].resultInfo->numOfRes = output;
-          if (output > 0) {
-            pCtx[j].resultInfo->hasResult = DATA_SET_FLAG;
-          }
+          doInvokeUdf(pRuntimeEnv->pUdfInfo, &pCtx[j], 0, TSDB_UDF_FUNC_FINALIZE);
         } else {
           aAggs[pCtx[j].functionId].xFinalize(&pCtx[j]);
         }
@@ -3254,23 +3297,7 @@ void finalizeQueryResult(SOperatorInfo* pOperator, SQLFunctionCtx* pCtx, SResult
   } else {
     for (int32_t j = 0; j < numOfOutput; ++j) {
       if (pCtx[j].functionId < 0) {
-        int32_t output = 0;
-        SResultRowCellInfo *pResInfo = GET_RES_INFO(pCtx);
-        void *interBuf = (void *)GET_ROWCELL_INTERBUF(pResInfo);
-
-        if (pRuntimeEnv->pUdfInfo && pRuntimeEnv->pUdfInfo->funcs[TSDB_UDF_FUNC_FINALIZE]) {
-            if (pRuntimeEnv->pUdfInfo->isScript) {
-              (*(scriptFinalizeFunc)pRuntimeEnv->pUdfInfo->funcs[TSDB_UDF_FUNC_FINALIZE])(pRuntimeEnv->pUdfInfo->pScriptCtx, pCtx[j].pOutput, &output);
-            } else {
-              (*(udfFinalizeFunc)pRuntimeEnv->pUdfInfo->funcs[TSDB_UDF_FUNC_FINALIZE])(pCtx[j].pOutput, interBuf, &output, &pRuntimeEnv->pUdfInfo->init);
-            }
-        }
-
-        // set the output value exist
-        pCtx[j].resultInfo->numOfRes = output;
-        if (output > 0) {
-          pCtx[j].resultInfo->hasResult = DATA_SET_FLAG;
-        }
+        doInvokeUdf(pRuntimeEnv->pUdfInfo, &pCtx[j], 0, TSDB_UDF_FUNC_FINALIZE);
       } else {
         aAggs[pCtx[j].functionId].xFinalize(&pCtx[j]);
       }
@@ -4642,7 +4669,7 @@ static void destroySlimitOperatorInfo(void* param, int32_t numOfOutput) {
 }
 
 SOperatorInfo* createGlobalAggregateOperatorInfo(SQueryRuntimeEnv* pRuntimeEnv, SOperatorInfo* upstream,
-                                                 SExprInfo* pExpr, int32_t numOfOutput, void* param) {
+                                                 SExprInfo* pExpr, int32_t numOfOutput, void* param, SArray* pUdfInfo) {
   SMultiwayMergeInfo* pInfo = calloc(1, sizeof(SMultiwayMergeInfo));
 
   pInfo->resultRowFactor =
@@ -4653,6 +4680,7 @@ SOperatorInfo* createGlobalAggregateOperatorInfo(SQueryRuntimeEnv* pRuntimeEnv,
 
   pInfo->pMerge = param;
   pInfo->bufCapacity = 4096;
+  pInfo->udfInfo   = pUdfInfo;
 
   pInfo->binfo.pRes = createOutputBuf(pExpr, numOfOutput, pInfo->bufCapacity * pInfo->resultRowFactor);
   pInfo->binfo.pCtx = createSQLFunctionCtx(pRuntimeEnv, pExpr, numOfOutput, &pInfo->binfo.rowCellInfoOffset);
@@ -4919,7 +4947,7 @@ static SSDataBlock* doArithmeticOperation(void* param, bool* newgroup) {
     }
 
     // Return result of the previous group in the firstly.
-    if (newgroup && pRes->info.rows > 0) {
+    if (*newgroup && pRes->info.rows > 0) {
       pArithInfo->existDataBlock = pBlock;
       clearNumOfRes(pInfo->pCtx, pOperator->numOfOutput);
       return pInfo->pRes;
diff --git a/src/query/src/qPlan.c b/src/query/src/qPlan.c
index 0554a887ec68ca3353b5e45c1067ea734ea98cfd..dccdc5e1d38e2e3929d901393201c80116752b0c 100644
--- a/src/query/src/qPlan.c
+++ b/src/query/src/qPlan.c
@@ -138,6 +138,12 @@ SArray* createExecOperatorPlan(SQueryAttr* pQueryAttr) {
   } else {  // diff/add/multiply/subtract/division
     op = OP_Arithmetic;
     taosArrayPush(plan, &op);
+
+    //arithmetic on scalar function
+    if (pQueryAttr->pExpr2 != NULL) {
+      op = OP_Arithmetic;
+      taosArrayPush(plan, &op);
+    }    
   }
 
   if (pQueryAttr->limit.limit > 0 || pQueryAttr->limit.offset > 0) {
diff --git a/tests/script/general/parser/udf_dll_stable.sim b/tests/script/general/parser/udf_dll_stable.sim
index 3dd43202aa62d7823356a6dd2bb7b086220b7637..b8da57467e912ff27f4fbda7226c75e089f04808 100644
--- a/tests/script/general/parser/udf_dll_stable.sim
+++ b/tests/script/general/parser/udf_dll_stable.sim
@@ -678,7 +678,6 @@ if $data61 != 8 then
    return -1
 endi
 
-
 sql select add_one(f1)+1 from stb1;
 if $rows != 17 then
   return -1