diff --git a/include/libs/executor/executor.h b/include/libs/executor/executor.h
index cff4b0234c2c37c8dac82b174a916a926bdfd564..0aa48ef2aa167318c37d92c7c92917ebc28a7f84 100644
--- a/include/libs/executor/executor.h
+++ b/include/libs/executor/executor.h
@@ -109,7 +109,7 @@ int32_t qCreateExecTask(SReadHandle* readHandle, int32_t vgId, uint64_t taskId,
  * @param tversion
  * @return
  */
-int32_t qGetQueriedTableSchemaVersion(qTaskInfo_t tinfo, char* dbName, char* tableName, int32_t* sversion,
+int32_t qGetQueryTableSchemaVersion(qTaskInfo_t tinfo, char* dbName, char* tableName, int32_t* sversion,
                                       int32_t* tversion);
 
 /**
diff --git a/source/client/inc/clientInt.h b/source/client/inc/clientInt.h
index 9380b73d2d26ecd4ca5b5e11145748f652e36ade..91f21f6e6a7957c0dc86880aef869c0992392659 100644
--- a/source/client/inc/clientInt.h
+++ b/source/client/inc/clientInt.h
@@ -222,8 +222,8 @@ typedef struct SRequestObj {
   SArray*              tableList;
   SQueryExecMetric     metric;
   SRequestSendRecvBody body;
-  bool                 stableQuery;
-  bool                 validateOnly;
+  bool                 stableQuery;  // todo refactor
+  bool                 validateOnly; // todo refactor
 
   bool     killed;
   uint32_t prevCode;  // previous error code: todo refactor, add update flag for catalog
@@ -247,9 +247,9 @@ void    doFreeReqResultInfo(SReqResultInfo* pResInfo);
 int32_t transferTableNameList(const char* tbList, int32_t acctId, char* dbName, SArray** pReq);
 void    syncCatalogFn(SMetaData* pResult, void* param, int32_t code);
 
-SRequestObj* execQuery(STscObj* pTscObj, const char* sql, int sqlLen, bool validateOnly);
+SRequestObj* execQuery(uint64_t connId, const char* sql, int sqlLen, bool validateOnly);
 TAOS_RES*    taosQueryImpl(TAOS* taos, const char* sql, bool validateOnly);
-void         taosAsyncQueryImpl(TAOS* taos, const char* sql, __taos_async_fn_t fp, void* param, bool validateOnly);
+void         taosAsyncQueryImpl(uint64_t connId, const char* sql, __taos_async_fn_t fp, void* param, bool validateOnly);
 
 static FORCE_INLINE SReqResultInfo* tmqGetCurResInfo(TAOS_RES* res) {
   SMqRspObj* msg = (SMqRspObj*)res;
@@ -297,7 +297,7 @@ int32_t  releaseTscObj(int64_t rid);
 
 uint64_t generateRequestId();
 
-void*        createRequest(STscObj* pObj, int32_t type);
+void*        createRequest(uint64_t connId, int32_t type);
 void         destroyRequest(SRequestObj* pRequest);
 SRequestObj* acquireRequest(int64_t rid);
 int32_t      releaseRequest(int64_t rid);
@@ -318,13 +318,13 @@ void processMsgFromServer(void* parent, SRpcMsg* pMsg, SEpSet* pEpSet);
 STscObj* taos_connect_internal(const char* ip, const char* user, const char* pass, const char* auth, const char* db,
                                uint16_t port, int connType);
 
-SRequestObj* launchQuery(STscObj* pTscObj, const char* sql, int sqlLen, bool validateOnly);
+SRequestObj* launchQuery(uint64_t connId, const char* sql, int sqlLen, bool validateOnly);
 
 int32_t parseSql(SRequestObj* pRequest, bool topicQuery, SQuery** pQuery, SStmtCallback* pStmtCb);
 
 int32_t getPlan(SRequestObj* pRequest, SQuery* pQuery, SQueryPlan** pPlan, SArray* pNodeList);
 
-int32_t buildRequest(STscObj* pTscObj, const char* sql, int sqlLen, SRequestObj** pRequest);
+int32_t buildRequest(uint64_t connId, const char* sql, int sqlLen, void* param, bool validateSql, SRequestObj** pRequest);
 
 void taos_close_internal(void* taos);
 
diff --git a/source/client/src/clientEnv.c b/source/client/src/clientEnv.c
index 89ecf16b4085c9a53f30a60af3870bb8d5230a51..ba92ed238b02489bb09d45fb65a0b0071f6fac9a 100644
--- a/source/client/src/clientEnv.c
+++ b/source/client/src/clientEnv.c
@@ -49,13 +49,8 @@ void cleanupTscQhandle() {
   // destroy handle
   taosCleanUpScheduler(tscQhandle);
 }
-static int32_t registerRequest(SRequestObj *pRequest) {
-  STscObj *pTscObj = acquireTscObj(pRequest->pTscObj->id);
-  if (NULL == pTscObj) {
-    terrno = TSDB_CODE_TSC_DISCONNECTED;
-    return terrno;
-  }
 
+static int32_t registerRequest(SRequestObj *pRequest, STscObj* pTscObj) {
   // connection has been released already, abort creating request.
   pRequest->self = taosAddRef(clientReqRefPool, pRequest);
 
@@ -246,29 +241,34 @@ STscObj *acquireTscObj(int64_t rid) { return (STscObj *)taosAcquireRef(clientCon
 
 int32_t releaseTscObj(int64_t rid) { return taosReleaseRef(clientConnRefPool, rid); }
 
-void *createRequest(STscObj *pObj, int32_t type) {
-  assert(pObj != NULL);
-
+void *createRequest(uint64_t connId, int32_t type) {
   SRequestObj *pRequest = (SRequestObj *)taosMemoryCalloc(1, sizeof(SRequestObj));
   if (NULL == pRequest) {
     terrno = TSDB_CODE_TSC_OUT_OF_MEMORY;
     return NULL;
   }
 
+  STscObj* pTscObj = acquireTscObj(connId);
+  if (pTscObj == NULL) {
+    terrno = TSDB_CODE_TSC_DISCONNECTED;
+    return NULL;
+  }
+
   pRequest->resType = RES_TYPE__QUERY;
-  pRequest->pDb = getDbOfConnection(pObj);
   pRequest->requestId = generateRequestId();
   pRequest->metric.start = taosGetTimestampUs();
 
   pRequest->body.resInfo.convertUcs4 = true;  // convert ucs4 by default
-
   pRequest->type = type;
-  pRequest->pTscObj = pObj;
+
+  pRequest->pDb = getDbOfConnection(pTscObj);
+  pRequest->pTscObj = pTscObj;
+
   pRequest->msgBuf = taosMemoryCalloc(1, ERROR_MSG_BUF_DEFAULT_SIZE);
   pRequest->msgBufLen = ERROR_MSG_BUF_DEFAULT_SIZE;
   tsem_init(&pRequest->body.rspSem, 0, 0);
 
-  if (registerRequest(pRequest)) {
+  if (registerRequest(pRequest, pTscObj)) {
     doDestroyRequest(pRequest);
     return NULL;
   }
@@ -327,8 +327,8 @@ void doDestroyRequest(void *p) {
   if (pRequest->self) {
     deregisterRequest(pRequest);
   }
-  taosMemoryFree(pRequest);
 
+  taosMemoryFree(pRequest);
   tscTrace("end to destroy request %" PRIx64 " p:%p", reqId, pRequest);
 }
 
@@ -338,7 +338,6 @@ void destroyRequest(SRequestObj *pRequest) {
   }
 
   taos_stop_query(pRequest);
-
   removeRequest(pRequest->self);
 }
 
diff --git a/source/client/src/clientImpl.c b/source/client/src/clientImpl.c
index 6fb3d980274b835af8636a635a8612fb36c3ad4f..a4a5ec7499e13369fd3113f3b0c624deb95861bb 100644
--- a/source/client/src/clientImpl.c
+++ b/source/client/src/clientImpl.c
@@ -148,29 +148,49 @@ STscObj* taos_connect_internal(const char* ip, const char* user, const char* pas
   return taosConnectImpl(user, &secretEncrypt[0], localDb, NULL, NULL, *pInst, connType);
 }
 
-int32_t buildRequest(STscObj* pTscObj, const char* sql, int sqlLen, SRequestObj** pRequest) {
-  *pRequest = createRequest(pTscObj, TSDB_SQL_SELECT);
+int32_t buildRequest(uint64_t connId, const char* sql, int sqlLen, void* param, bool validateSql, SRequestObj** pRequest) {
+  *pRequest = createRequest(connId, TSDB_SQL_SELECT);
   if (*pRequest == NULL) {
-    tscError("failed to malloc sqlObj");
+    tscError("failed to malloc sqlObj, %s", sql);
     return TSDB_CODE_TSC_OUT_OF_MEMORY;
   }
 
   (*pRequest)->sqlstr = taosMemoryMalloc(sqlLen + 1);
   if ((*pRequest)->sqlstr == NULL) {
-    tscError("0x%" PRIx64 " failed to prepare sql string buffer", (*pRequest)->self);
-    (*pRequest)->msgBuf = strdup("failed to prepare sql string buffer");
+    tscError("0x%" PRIx64 " failed to prepare sql string buffer, %s", (*pRequest)->self, sql);
+    destroyRequest(*pRequest);
+    *pRequest = NULL;
     return TSDB_CODE_TSC_OUT_OF_MEMORY;
   }
 
   strntolower((*pRequest)->sqlstr, sql, (int32_t)sqlLen);
   (*pRequest)->sqlstr[sqlLen] = 0;
-  (*pRequest)->sqlLen = sqlLen;
+  (*pRequest)->sqlLen       = sqlLen;
+  (*pRequest)->validateOnly = validateSql;
+
+  if (param == NULL) {
+    SSyncQueryParam* pParam = taosMemoryCalloc(1, sizeof(SSyncQueryParam));
+    if (pParam == NULL) {
+      destroyRequest(*pRequest);
+      *pRequest = NULL;
+      return TSDB_CODE_TSC_OUT_OF_MEMORY;
+    }
+
+    tsem_init(&pParam->sem, 0, 0);
+    pParam->pRequest = (*pRequest);
+    param = pParam;
+  }
+
+  (*pRequest)->body.param = param;
 
+  STscObj* pTscObj = (*pRequest)->pTscObj;
   if (taosHashPut(pTscObj->pRequests, &(*pRequest)->self, sizeof((*pRequest)->self), &(*pRequest)->self,
                   sizeof((*pRequest)->self))) {
+    tscError("%d failed to add to request container, reqId:0x%" PRIx64 ", conn:%d, %s", (*pRequest)->self,
+             (*pRequest)->requestId, pTscObj->id, sql);
+
     destroyRequest(*pRequest);
     *pRequest = NULL;
-    tscError("put request to request hash failed");
     return TSDB_CODE_TSC_OUT_OF_MEMORY;
   }
 
@@ -882,18 +902,16 @@ SRequestObj* launchQueryImpl(SRequestObj* pRequest, SQuery* pQuery, bool keepQue
   return pRequest;
 }
 
-SRequestObj* launchQuery(STscObj* pTscObj, const char* sql, int sqlLen, bool validateOnly) {
+SRequestObj* launchQuery(uint64_t connId, const char* sql, int sqlLen, bool validateOnly) {
   SRequestObj* pRequest = NULL;
   SQuery*      pQuery = NULL;
 
-  int32_t code = buildRequest(pTscObj, sql, sqlLen, &pRequest);
+  int32_t code = buildRequest(connId, sql, sqlLen, NULL, validateOnly, &pRequest);
   if (code != TSDB_CODE_SUCCESS) {
     terrno = code;
     return NULL;
   }
 
-  pRequest->validateOnly = validateOnly;
-
   code = parseSql(pRequest, false, &pQuery, NULL);
   if (code != TSDB_CODE_SUCCESS) {
     pRequest->code = code;
@@ -1044,19 +1062,20 @@ int32_t removeMeta(STscObj* pTscObj, SArray* tbList) {
   return TSDB_CODE_SUCCESS;
 }
 
-SRequestObj* execQuery(STscObj* pTscObj, const char* sql, int sqlLen, bool validateOnly) {
+//  todo remove it soon
+SRequestObj* execQuery(uint64_t connId, const char* sql, int sqlLen, bool validateOnly) {
   SRequestObj* pRequest = NULL;
   int32_t      retryNum = 0;
   int32_t      code = 0;
 
   do {
     destroyRequest(pRequest);
-    pRequest = launchQuery(pTscObj, sql, sqlLen, validateOnly);
+    pRequest = launchQuery(connId, sql, sqlLen, validateOnly);
     if (pRequest == NULL || TSDB_CODE_SUCCESS == pRequest->code || !NEED_CLIENT_HANDLE_ERROR(pRequest->code)) {
       break;
     }
 
-    code = refreshMeta(pTscObj, pRequest);
+    code = refreshMeta(pRequest->pTscObj, pRequest);
     if (code) {
       pRequest->code = code;
       break;
@@ -1064,7 +1083,7 @@ SRequestObj* execQuery(STscObj* pTscObj, const char* sql, int sqlLen, bool valid
   } while (retryNum++ < REQUEST_TOTAL_EXEC_TIMES);
 
   if (NEED_CLIENT_RM_TBLMETA_REQ(pRequest->type)) {
-    removeMeta(pTscObj, pRequest->tableList);
+    removeMeta(pRequest->pTscObj, pRequest->tableList);
   }
 
   return pRequest;
@@ -1119,7 +1138,7 @@ STscObj* taosConnectImpl(const char* user, const char* auth, const char* db, __t
     return pTscObj;
   }
 
-  SRequestObj* pRequest = createRequest(pTscObj, TDMT_MND_CONNECT);
+  SRequestObj* pRequest = createRequest(pTscObj->id, TDMT_MND_CONNECT);
   if (pRequest == NULL) {
     destroyTscObj(pTscObj);
     terrno = TSDB_CODE_TSC_OUT_OF_MEMORY;
@@ -1446,15 +1465,10 @@ void* doAsyncFetchRows(SRequestObj* pRequest, bool setupOneRowPtr, bool convertU
       return NULL;
     }
 
-    SSyncQueryParam* pParam = pRequest->body.param;
-    if (NULL == pParam) {
-      pParam = taosMemoryCalloc(1, sizeof(SSyncQueryParam));
-      tsem_init(&pParam->sem, 0, 0);
-    }
-
     // convert ucs4 to native multi-bytes string
     pResultInfo->convertUcs4 = convertUcs4;
 
+    SSyncQueryParam* pParam = pRequest->body.param;
     taos_fetch_rows_a(pRequest, syncFetchFn, pParam);
     tsem_wait(&pParam->sem);
   }
@@ -2026,22 +2040,9 @@ void syncQueryFn(void* param, void* res, int32_t code) {
   tsem_post(&pParam->sem);
 }
 
-void taosAsyncQueryImpl(TAOS* taos, const char* sql, __taos_async_fn_t fp, void* param, bool validateOnly) {
-  if (NULL == taos) {
-    terrno = TSDB_CODE_TSC_DISCONNECTED;
-    fp(param, NULL, terrno);
-    return;
-  }
-
-  int64_t  rid = *(int64_t*)taos;
-  STscObj* pTscObj = acquireTscObj(rid);
-  if (pTscObj == NULL || sql == NULL || NULL == fp) {
+void taosAsyncQueryImpl(uint64_t connId, const char* sql, __taos_async_fn_t fp, void* param, bool validateOnly) {
+  if (sql == NULL || NULL == fp) {
     terrno = TSDB_CODE_INVALID_PARA;
-    if (pTscObj) {
-      releaseTscObj(rid);
-    } else {
-      terrno = TSDB_CODE_TSC_DISCONNECTED;
-    }
     fp(param, NULL, terrno);
     return;
   }
@@ -2050,26 +2051,20 @@ void taosAsyncQueryImpl(TAOS* taos, const char* sql, __taos_async_fn_t fp, void*
   if (sqlLen > (size_t)TSDB_MAX_ALLOWED_SQL_LEN) {
     tscError("sql string exceeds max length:%d", TSDB_MAX_ALLOWED_SQL_LEN);
     terrno = TSDB_CODE_TSC_EXCEED_SQL_LIMIT;
-    releaseTscObj(rid);
-
     fp(param, NULL, terrno);
     return;
   }
 
   SRequestObj* pRequest = NULL;
-  int32_t      code = buildRequest(pTscObj, sql, sqlLen, &pRequest);
+  int32_t      code = buildRequest(connId, sql, sqlLen, param, validateOnly, &pRequest);
   if (code != TSDB_CODE_SUCCESS) {
     terrno = code;
-    releaseTscObj(rid);
     fp(param, NULL, terrno);
     return;
   }
 
-  pRequest->validateOnly = validateOnly;
   pRequest->body.queryFp = fp;
-  pRequest->body.param = param;
   doAsyncQuery(pRequest, false);
-  releaseTscObj(rid);
 }
 
 TAOS_RES* taosQueryImpl(TAOS* taos, const char* sql, bool validateOnly) {
@@ -2078,36 +2073,22 @@ TAOS_RES* taosQueryImpl(TAOS* taos, const char* sql, bool validateOnly) {
     return NULL;
   }
 
-  int64_t  rid = *(int64_t*)taos;
-  STscObj* pTscObj = acquireTscObj(rid);
-  if (pTscObj == NULL || sql == NULL) {
-    terrno = TSDB_CODE_TSC_DISCONNECTED;
-    return NULL;
-  }
-
 #if SYNC_ON_TOP_OF_ASYNC
   SSyncQueryParam* param = taosMemoryCalloc(1, sizeof(SSyncQueryParam));
   tsem_init(&param->sem, 0, 0);
 
-  taosAsyncQueryImpl((TAOS*)&rid, sql, syncQueryFn, param, validateOnly);
+  taosAsyncQueryImpl(*(int64_t*)taos, sql, syncQueryFn, param, validateOnly);
   tsem_wait(&param->sem);
-
-  releaseTscObj(rid);
-
   return param->pRequest;
 #else
   size_t sqlLen = strlen(sql);
   if (sqlLen > (size_t)TSDB_MAX_ALLOWED_SQL_LEN) {
-    releaseTscObj(rid);
     tscError("sql string exceeds max length:%d", TSDB_MAX_ALLOWED_SQL_LEN);
     terrno = TSDB_CODE_TSC_EXCEED_SQL_LIMIT;
     return NULL;
   }
 
-  TAOS_RES* pRes = execQuery(pTscObj, sql, sqlLen, validateOnly);
-
-  releaseTscObj(rid);
-
+  TAOS_RES* pRes = execQuery(connId, sql, sqlLen, validateOnly);
   return pRes;
 #endif
 }
diff --git a/source/client/src/clientMain.c b/source/client/src/clientMain.c
index e908046b1e3adfef72ceed24055d988e2fda9cb7..12de522cbc506fb4f2aa89fd571cc9399e7846f8 100644
--- a/source/client/src/clientMain.c
+++ b/source/client/src/clientMain.c
@@ -479,7 +479,6 @@ void taos_stop_query(TAOS_RES *res) {
   }
 
   schedulerFreeJob(&pRequest->body.queryJob, TSDB_CODE_TSC_QUERY_KILLED);
-
   tscDebug("request %" PRIx64 " killed", pRequest->requestId);
 }
 
@@ -706,7 +705,8 @@ void retrieveMetaCallback(SMetaData *pResultMeta, void *param, int32_t code) {
 }
 
 void taos_query_a(TAOS *taos, const char *sql, __taos_async_fn_t fp, void *param) {
-  taosAsyncQueryImpl(taos, sql, fp, param, false);
+  int64_t  connId = *(int64_t*)taos;
+  taosAsyncQueryImpl(connId, sql, fp, param, false);
 }
 
 int32_t createParseContext(const SRequestObj *pRequest, SParseContext **pCxt) {
@@ -915,7 +915,7 @@ int taos_load_table_info(TAOS *taos, const char *tableNameList) {
     return terrno;
   }
 
-  int64_t       rid = *(int64_t *)taos;
+  int64_t       connId = *(int64_t *)taos;
   const int32_t MAX_TABLE_NAME_LENGTH = 12 * 1024 * 1024;  // 12MB list
   int32_t       code = 0;
   SRequestObj * pRequest = NULL;
@@ -933,12 +933,14 @@ int taos_load_table_info(TAOS *taos, const char *tableNameList) {
     return TSDB_CODE_TSC_INVALID_OPERATION;
   }
 
-  STscObj *pTscObj = acquireTscObj(rid);
-  if (pTscObj == NULL) {
-    terrno = TSDB_CODE_TSC_DISCONNECTED;
-    return terrno;
+  char *sql = "taos_load_table_info";
+  code = buildRequest(connId, sql, strlen(sql), NULL, false, &pRequest);
+  if (code != TSDB_CODE_SUCCESS) {
+    terrno = code;
+    goto _return;
   }
 
+  STscObj* pTscObj = pRequest->pTscObj;
   code = transferTableNameList(tableNameList, pTscObj->acctId, pTscObj->db, &catalogReq.pTableMeta);
   if (code) {
     goto _return;
@@ -950,36 +952,22 @@ int taos_load_table_info(TAOS *taos, const char *tableNameList) {
     goto _return;
   }
 
-  char *sql = "taos_load_table_info";
-  code = buildRequest(pTscObj, sql, strlen(sql), &pRequest);
-  if (code != TSDB_CODE_SUCCESS) {
-    terrno = code;
-    goto _return;
-  }
-
-  SSyncQueryParam param = {0};
-  tsem_init(&param.sem, 0, 0);
-  param.pRequest = pRequest;
-
   SRequestConnInfo conn = {
       .pTrans = pTscObj->pAppInfo->pTransporter, .requestId = pRequest->requestId, .requestObjRefId = pRequest->self};
 
   conn.mgmtEps = getEpSet_s(&pTscObj->pAppInfo->mgmtEp);
 
-  code = catalogAsyncGetAllMeta(pCtg, &conn, &catalogReq, syncCatalogFn, &param, NULL);
+  code = catalogAsyncGetAllMeta(pCtg, &conn, &catalogReq, syncCatalogFn, NULL, NULL);
   if (code) {
     goto _return;
   }
 
-  tsem_wait(&param.sem);
+  SSyncQueryParam* pParam = pRequest->body.param;
+  tsem_wait(&pParam->sem);
 
 _return:
-
   taosArrayDestroy(catalogReq.pTableMeta);
   destroyRequest(pRequest);
-
-  releaseTscObj(rid);
-
   return code;
 }
 
diff --git a/source/client/src/clientSml.c b/source/client/src/clientSml.c
index b6972e4670b972dc5d5a2d0235202bd8b318beb0..6e689adf957ae9be4e4f3b06f17d25278507ee69 100644
--- a/source/client/src/clientSml.c
+++ b/source/client/src/clientSml.c
@@ -2442,22 +2442,15 @@ TAOS_RES* taos_schemaless_insert(TAOS* taos, char* lines[], int numLines, int pr
     return NULL;
   }
 
-  int64_t rid = *(int64_t*)taos;
-  STscObj* pTscObj = acquireTscObj(rid);
-  if (NULL == pTscObj) {
-    terrno = TSDB_CODE_TSC_DISCONNECTED;
-    uError("SML:taos_schemaless_insert invalid taos");
-    return NULL;
-  }
-  
-  SRequestObj* request = (SRequestObj*)createRequest(pTscObj, TSDB_SQL_INSERT);
+  SRequestObj* request = (SRequestObj*)createRequest(*(int64_t*)taos, TSDB_SQL_INSERT);
   if(!request){
-    releaseTscObj(rid);
     uError("SML:taos_schemaless_insert error request is null");
     return NULL;
   }
 
   int    batchs = 0;
+  STscObj* pTscObj = request->pTscObj;
+
   pTscObj->schemalessType = 1;
   SSmlMsgBuf msg = {ERROR_MSG_BUF_DEFAULT_SIZE, request->msgBuf};
 
@@ -2507,7 +2500,7 @@ TAOS_RES* taos_schemaless_insert(TAOS* taos, char* lines[], int numLines, int pr
 
   batchs = ceil(((double)numLines) / LINE_BATCH);
   for (int i = 0; i < batchs; ++i) {
-    SRequestObj* req = (SRequestObj*)createRequest(pTscObj, TSDB_SQL_INSERT);
+    SRequestObj* req = (SRequestObj*)createRequest(pTscObj->id, TSDB_SQL_INSERT);
     if(!req){
       request->code = TSDB_CODE_OUT_OF_MEMORY;
       uError("SML:taos_schemaless_insert error request is null");
@@ -2549,6 +2542,5 @@ end:
 //  ((STscObj *)taos)->schemalessType = 0;
   pTscObj->schemalessType = 1;
   uDebug("resultend:%s", request->msgBuf);
-  releaseTscObj(rid);
   return (TAOS_RES*)request;
 }
diff --git a/source/client/src/clientStmt.c b/source/client/src/clientStmt.c
index 1e0f30695dca6a851cf0cafd85d1057635a9fc77..d653b8720f63b14ab15e3f2a77448adbd4d1b0c6 100644
--- a/source/client/src/clientStmt.c
+++ b/source/client/src/clientStmt.c
@@ -5,6 +5,14 @@
 
 #include "clientStmt.h"
 
+static int32_t stmtCreateRequest(STscStmt* pStmt) {
+  if (pStmt->exec.pRequest == NULL)  {
+    return buildRequest(pStmt->taos->id, pStmt->sql.sqlStr, pStmt->sql.sqlLen, NULL, false, &pStmt->exec.pRequest);
+  } else {
+    return TSDB_CODE_SUCCESS;
+  }
+}
+
 int32_t stmtSwitchStatus(STscStmt* pStmt, STMT_STATUS newStatus) {
   int32_t code = 0;
 
@@ -217,9 +225,7 @@ int32_t stmtParseSql(STscStmt* pStmt) {
       .getExecInfoFn = stmtGetExecInfo,
   };
 
-  if (NULL == pStmt->exec.pRequest) {
-    STMT_ERR_RET(buildRequest(pStmt->taos, pStmt->sql.sqlStr, pStmt->sql.sqlLen, &pStmt->exec.pRequest));
-  }
+  STMT_ERR_RET(stmtCreateRequest(pStmt));
 
   STMT_ERR_RET(parseSql(pStmt->exec.pRequest, false, &pStmt->sql.pQuery, &stmtCb));
 
@@ -532,9 +538,7 @@ int stmtSetTbName(TAOS_STMT* stmt, const char* tbName) {
     STMT_ERR_RET(TSDB_CODE_TSC_STMT_API_ERROR);
   }
 
-  if (NULL == pStmt->exec.pRequest) {
-    STMT_ERR_RET(buildRequest(pStmt->taos, pStmt->sql.sqlStr, pStmt->sql.sqlLen, &pStmt->exec.pRequest));
-  }
+  STMT_ERR_RET(stmtCreateRequest(pStmt));
 
   STMT_ERR_RET(qCreateSName(&pStmt->bInfo.sname, tbName, pStmt->taos->acctId, pStmt->exec.pRequest->pDb,
                             pStmt->exec.pRequest->msgBuf, pStmt->exec.pRequest->msgBufLen));
@@ -625,9 +629,7 @@ int stmtBindBatch(TAOS_STMT* stmt, TAOS_MULTI_BIND* bind, int32_t colIdx) {
     pStmt->exec.pRequest = NULL;
   }
 
-  if (NULL == pStmt->exec.pRequest) {
-    STMT_ERR_RET(buildRequest(pStmt->taos, pStmt->sql.sqlStr, pStmt->sql.sqlLen, &pStmt->exec.pRequest));
-  }
+  STMT_ERR_RET(stmtCreateRequest(pStmt));
 
   if (pStmt->bInfo.needParse) {
     STMT_ERR_RET(stmtParseSql(pStmt));
@@ -873,9 +875,7 @@ int stmtGetTagFields(TAOS_STMT* stmt, int* nums, TAOS_FIELD_E** fields) {
     pStmt->exec.pRequest = NULL;
   }
 
-  if (NULL == pStmt->exec.pRequest) {
-    STMT_ERR_RET(buildRequest(pStmt->taos, pStmt->sql.sqlStr, pStmt->sql.sqlLen, &pStmt->exec.pRequest));
-  }
+  STMT_ERR_RET(stmtCreateRequest(pStmt));
 
   if (pStmt->bInfo.needParse) {
     STMT_ERR_RET(stmtParseSql(pStmt));
@@ -905,9 +905,7 @@ int stmtGetColFields(TAOS_STMT* stmt, int* nums, TAOS_FIELD_E** fields) {
     pStmt->exec.pRequest = NULL;
   }
 
-  if (NULL == pStmt->exec.pRequest) {
-    STMT_ERR_RET(buildRequest(pStmt->taos, pStmt->sql.sqlStr, pStmt->sql.sqlLen, &pStmt->exec.pRequest));
-  }
+  STMT_ERR_RET(stmtCreateRequest(pStmt));
 
   if (pStmt->bInfo.needParse) {
     STMT_ERR_RET(stmtParseSql(pStmt));
@@ -933,10 +931,7 @@ int stmtGetParamNum(TAOS_STMT* stmt, int* nums) {
     pStmt->exec.pRequest = NULL;
   }
 
-  if (NULL == pStmt->exec.pRequest) {
-    STMT_ERR_RET(buildRequest(pStmt->taos, pStmt->sql.sqlStr, pStmt->sql.sqlLen, &pStmt->exec.pRequest));
-  }
-
+  STMT_ERR_RET(stmtCreateRequest(pStmt));
   if (pStmt->bInfo.needParse) {
     STMT_ERR_RET(stmtParseSql(pStmt));
   }
@@ -969,9 +964,7 @@ int stmtGetParam(TAOS_STMT* stmt, int idx, int* type, int* bytes) {
     pStmt->exec.pRequest = NULL;
   }
 
-  if (NULL == pStmt->exec.pRequest) {
-    STMT_ERR_RET(buildRequest(pStmt->taos, pStmt->sql.sqlStr, pStmt->sql.sqlLen, &pStmt->exec.pRequest));
-  }
+  STMT_ERR_RET(stmtCreateRequest(pStmt));
 
   if (pStmt->bInfo.needParse) {
     STMT_ERR_RET(stmtParseSql(pStmt));
diff --git a/source/client/src/tmq.c b/source/client/src/tmq.c
index cea6905c6944d0359274c3466582c2ec67db0f93..614174d97ae54acf64bb80d67c5dc3882409de04 100644
--- a/source/client/src/tmq.c
+++ b/source/client/src/tmq.c
@@ -2267,13 +2267,7 @@ static int32_t taosCreateStb(TAOS *taos, void *meta, int32_t metaLen){
   int32_t code = TSDB_CODE_SUCCESS;
   SRequestObj* pRequest = NULL;
 
-  STscObj *pTscObj = acquireTscObj(*(int64_t *)taos);
-  if (NULL == pTscObj) {
-    code = TSDB_CODE_TSC_DISCONNECTED;
-    goto end;
-  }
-
-  code = buildRequest(pTscObj, "", 0, &pRequest);
+  code = buildRequest(*(int64_t*)taos, "", 0, NULL, false, &pRequest);
   if (code != TSDB_CODE_SUCCESS) {
     goto end;
   }
@@ -2313,6 +2307,8 @@ static int32_t taosCreateStb(TAOS *taos, void *meta, int32_t metaLen){
   pReq.suid = req.suid;
   pReq.source = 1;
 
+  STscObj* pTscObj = pRequest->pTscObj;
+
   SName tableName;
   tNameExtractFullName(toName(pTscObj->acctId, pRequest->pDb, req.name, &tableName), pReq.name);
 
@@ -2351,13 +2347,7 @@ static int32_t taosDropStb(TAOS *taos, void *meta, int32_t metaLen){
   int32_t code = TSDB_CODE_SUCCESS;
   SRequestObj* pRequest = NULL;
 
-  STscObj *pTscObj = acquireTscObj(*(int64_t *)taos);
-  if (NULL == pTscObj) {
-    code = TSDB_CODE_TSC_DISCONNECTED;
-    goto end;
-  }
-
-  code = buildRequest(pTscObj, "", 0, &pRequest);
+  code = buildRequest(*(int64_t*)taos, "", 0, NULL, false, &pRequest);
   if (code != TSDB_CODE_SUCCESS) {
     goto end;
   }
@@ -2379,6 +2369,9 @@ static int32_t taosDropStb(TAOS *taos, void *meta, int32_t metaLen){
   pReq.igNotExists = true;
   pReq.source = 1;
   pReq.suid = req.suid;
+
+  STscObj* pTscObj = pRequest->pTscObj;
+
   SName tableName;
   tNameExtractFullName(toName(pTscObj->acctId, pRequest->pDb, req.name, &tableName), pReq.name);
 
@@ -2427,14 +2420,8 @@ static int32_t taosCreateTable(TAOS *taos, void *meta, int32_t metaLen){
   SRequestObj        *pRequest        = NULL;
   SQuery             *pQuery          = NULL;
   SHashObj           *pVgroupHashmap  = NULL;
-  STscObj            *pTscObj         = acquireTscObj(*(int64_t *)taos);
 
-  if (NULL == pTscObj) {
-    code = TSDB_CODE_TSC_DISCONNECTED;
-    goto end;
-  }
-
-  code = buildRequest(pTscObj, "", 0, &pRequest);
+  code = buildRequest(*(int64_t*) taos, "", 0, NULL, false, &pRequest);
   if (code != TSDB_CODE_SUCCESS) {
     goto end;
   }
@@ -2452,7 +2439,9 @@ static int32_t taosCreateTable(TAOS *taos, void *meta, int32_t metaLen){
     goto end;
   }
 
-  SVCreateTbReq     *pCreateReq = NULL;
+  STscObj* pTscObj = pRequest->pTscObj;
+
+  SVCreateTbReq *pCreateReq = NULL;
   SCatalog* pCatalog = NULL;
   code = catalogGetHandle(pTscObj->pAppInfo->clusterId, &pCatalog);
   if (code != TSDB_CODE_SUCCESS) {
@@ -2544,14 +2533,8 @@ static int32_t taosDropTable(TAOS *taos, void *meta, int32_t metaLen){
   SRequestObj        *pRequest        = NULL;
   SQuery             *pQuery          = NULL;
   SHashObj           *pVgroupHashmap  = NULL;
-  STscObj            *pTscObj         = acquireTscObj(*(int64_t *)taos);
-
-  if (NULL == pTscObj) {
-    code = TSDB_CODE_TSC_DISCONNECTED;
-    goto end;
-  }
 
-  code = buildRequest(pTscObj, "", 0, &pRequest);
+  code = buildRequest(*(int64_t*)taos, "", 0, NULL, false, &pRequest);
   if (code != TSDB_CODE_SUCCESS) {
     goto end;
   }
@@ -2569,6 +2552,8 @@ static int32_t taosDropTable(TAOS *taos, void *meta, int32_t metaLen){
     goto end;
   }
 
+  STscObj* pTscObj = pRequest->pTscObj;
+
   SVDropTbReq     *pDropReq = NULL;
   SCatalog        *pCatalog = NULL;
   code = catalogGetHandle(pTscObj->pAppInfo->clusterId, &pCatalog);
@@ -2649,14 +2634,9 @@ static int32_t taosAlterTable(TAOS *taos, void *meta, int32_t metaLen){
   SQuery             *pQuery          = NULL;
   SArray             *pArray          = NULL;
   SVgDataBlocks      *pVgData         = NULL;
-  STscObj            *pTscObj         = acquireTscObj(*(int64_t *)taos);
 
-  if (NULL == pTscObj) {
-    code = TSDB_CODE_TSC_DISCONNECTED;
-    goto end;
-  }
 
-  code = buildRequest(pTscObj, "", 0, &pRequest);
+  code = buildRequest(*(int64_t*) taos, "", 0, NULL, false, &pRequest);
   if (code != TSDB_CODE_SUCCESS) {
     goto end;
   }
@@ -2679,7 +2659,8 @@ static int32_t taosAlterTable(TAOS *taos, void *meta, int32_t metaLen){
     goto end;
   }
 
-  SCatalog        *pCatalog = NULL;
+  STscObj*  pTscObj = pRequest->pTscObj;
+  SCatalog* pCatalog = NULL;
   code = catalogGetHandle(pTscObj->pAppInfo->clusterId, &pCatalog);
   if (code != TSDB_CODE_SUCCESS) {
     goto end;
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index f650480ff2b58debb9a92d0f53587ecb3a13af8a..51f7f237762b8900c61c9c5d1e7bf42b4a52a9c5 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -59,7 +59,6 @@ typedef struct SBlockLoadSuppInfo {
   SColumnDataAgg   tsColAgg;
   SColumnDataAgg** plist;
   int16_t*         colIds;    // column ids for loading file block data
-  int32_t*         slotIds;   // colId to slotId
   char**           buildBuf;  // build string tmp buffer, todo remove it later after all string format being updated.
 } SBlockLoadSuppInfo;
 
@@ -183,7 +182,6 @@ static SHashObj* createDataBlockScanInfo(STsdbReader* pTsdbReader, const STableK
     return NULL;
   }
 
-  // todo apply the lastkey of table check to avoid to load header file
   for (int32_t j = 0; j < numOfTables; ++j) {
     STableBlockScanInfo info = {.lastKey = 0, .uid = idList[j].uid};
     if (ASCENDING_TRAVERSE(pTsdbReader->order)) {
@@ -218,6 +216,30 @@ static void resetDataBlockScanInfo(SHashObj* pTableMap) {
   }
 }
 
+static void destroyBlockScanInfo(SHashObj* pTableMap) {
+  STableBlockScanInfo* p = NULL;
+
+  while ((p = taosHashIterate(pTableMap, p)) != NULL) {
+    p->iterInit = false;
+    p->iiter.hasVal = false;
+
+    if (p->iter.iter != NULL) {
+      tsdbTbDataIterDestroy(p->iter.iter);
+      p->iter.iter = NULL;
+    }
+
+    if (p->iiter.iter != NULL) {
+      tsdbTbDataIterDestroy(p->iiter.iter);
+      p->iiter.iter = NULL;
+    }
+
+    taosArrayDestroy(p->delSkyline);
+    p->delSkyline = NULL;
+  }
+
+  taosHashCleanup(pTableMap);
+}
+
 static bool isEmptyQueryTimeWindow(STimeWindow* pWindow) {
   ASSERT(pWindow != NULL);
   return pWindow->skey > pWindow->ekey;
@@ -265,6 +287,10 @@ static int32_t initFilesetIterator(SFilesetIter* pIter, const STsdbFSState* pFSt
   return TSDB_CODE_SUCCESS;
 }
 
+static void cleanupFilesetIterator(SFilesetIter* pIter) {
+  taosArrayDestroy(pIter->pFileList);
+}
+
 static bool filesetIteratorNext(SFilesetIter* pIter, STsdbReader* pReader) {
   bool    asc = ASCENDING_TRAVERSE(pIter->order);
   int32_t step = asc ? 1 : -1;
@@ -313,7 +339,15 @@ static void resetDataBlockIterator(SDataBlockIter* pIter, int32_t order) {
   pIter->order = order;
   pIter->index = -1;
   pIter->numOfBlocks = -1;
-  pIter->blockList = taosArrayInit(4, sizeof(SFileDataBlockInfo));
+  if (pIter->blockList == NULL) {
+    pIter->blockList = taosArrayInit(4, sizeof(SFileDataBlockInfo));
+  } else {
+    taosArrayClear(pIter->blockList);
+  }
+}
+
+static void cleanupDataBlockIterator(SDataBlockIter* pIter) {
+  taosArrayDestroy(pIter->blockList);
 }
 
 static void initReaderStatus(SReaderStatus* pStatus) {
@@ -2515,6 +2549,7 @@ void doMergeMultiRows(TSDBROW* pRow, uint64_t uid, SIterInfo* pIter, SArray* pDe
   tRowMergerInit(&merge, pRow, pReader->pSchema);
   doMergeRowsInBuf(pIter, k.ts, pDelList, &merge, pReader);
   tRowMergerGetRow(&merge, pTSRow);
+  tRowMergerClear(&merge);
 }
 
 void doMergeMemIMemRows(TSDBROW* pRow, TSDBROW* piRow, STableBlockScanInfo* pBlockScanInfo, STsdbReader* pReader,
@@ -2651,6 +2686,7 @@ int32_t buildDataBlockFromBufImpl(STableBlockScanInfo* pBlockScanInfo, int64_t e
     }
 
     doAppendOneRow(pBlock, pReader, pTSRow);
+    taosMemoryFree(pTSRow);
 
     // no data in buffer, return immediately
     if (!(pBlockScanInfo->iter.hasVal || pBlockScanInfo->iiter.hasVal)) {
@@ -2778,11 +2814,24 @@ void tsdbReaderClose(STsdbReader* pReader) {
     return;
   }
 
+  SBlockLoadSuppInfo* pSupInfo = &pReader->suppInfo;
+
+  taosMemoryFreeClear(pSupInfo->plist);
+  taosMemoryFree(pSupInfo->colIds);
+
+  taosArrayDestroy(pSupInfo->pColAgg);
+  for(int32_t i = 0; i < blockDataGetNumOfCols(pReader->pResBlock); ++i) {
+    if (pSupInfo->buildBuf[i] != NULL) {
+      taosMemoryFreeClear(pSupInfo->buildBuf[i]);
+    }
+  }
+  taosMemoryFree(pSupInfo->buildBuf);
+
+  cleanupFilesetIterator(&pReader->status.fileIter);
+  cleanupDataBlockIterator(&pReader->status.blockIter);
+  destroyBlockScanInfo(pReader->status.pTableMap);
   blockDataDestroy(pReader->pResBlock);
-  taosMemoryFreeClear(pReader->suppInfo.plist);
 
-  taosArrayDestroy(pReader->suppInfo.pColAgg);
-  taosMemoryFree(pReader->suppInfo.slotIds);
 
 #if 0
 //   if (pReader->status.pTableScanInfo != NULL) {
diff --git a/source/libs/executor/src/executor.c b/source/libs/executor/src/executor.c
index fc35fba93515482455c7e20ca95b6fd062d7b5c0..5a1a46a9b8312364ab937ba90ca1155d72a5beeb 100644
--- a/source/libs/executor/src/executor.c
+++ b/source/libs/executor/src/executor.c
@@ -184,7 +184,7 @@ int32_t qUpdateQualifiedTableId(qTaskInfo_t tinfo, const SArray* tableIdList, bo
   return code;
 }
 
-int32_t qGetQueriedTableSchemaVersion(qTaskInfo_t tinfo, char* dbName, char* tableName, int32_t* sversion,
+int32_t qGetQueryTableSchemaVersion(qTaskInfo_t tinfo, char* dbName, char* tableName, int32_t* sversion,
                                       int32_t* tversion) {
   ASSERT(tinfo != NULL && dbName != NULL && tableName != NULL);
   SExecTaskInfo* pTaskInfo = (SExecTaskInfo*)tinfo;
diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index b209684388d83c4a128eca2fb6891277d8aa0e8a..8171c7e42ee1522da6e64fb2f21382f8ee0f20ec 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -13,6 +13,7 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <executorimpl.h>
 #include "filter.h"
 #include "function.h"
 #include "functionMgt.h"
@@ -4052,7 +4053,7 @@ static STsdbReader* doCreateDataReader(STableScanPhysiNode* pTableScanNode, SRea
 
 static SArray* extractColumnInfo(SNodeList* pNodeList);
 
-int32_t extractTableSchemaVersion(SReadHandle* pHandle, uint64_t uid, SExecTaskInfo* pTaskInfo) {
+int32_t extractTableSchemaInfo(SReadHandle* pHandle, uint64_t uid, SExecTaskInfo* pTaskInfo) {
   SMetaReader mr = {0};
   metaReaderInit(&mr, pHandle->meta, 0);
   int32_t code = metaGetTableEntryByUid(&mr, uid);
@@ -4076,10 +4077,20 @@ int32_t extractTableSchemaVersion(SReadHandle* pHandle, uint64_t uid, SExecTaskI
   }
 
   metaReaderClear(&mr);
-
   return TSDB_CODE_SUCCESS;
 }
 
+static void cleanupTableSchemaInfo(SExecTaskInfo* pTaskInfo) {
+  taosMemoryFreeClear(pTaskInfo->schemaVer.dbname);
+  if (pTaskInfo->schemaVer.sw == NULL) {
+    return;
+  }
+
+  taosMemoryFree(pTaskInfo->schemaVer.sw->pSchema);
+  taosMemoryFree(pTaskInfo->schemaVer.sw);
+  taosMemoryFree(pTaskInfo->schemaVer.tablename);
+}
+
 static int32_t sortTableGroup(STableListInfo* pTableListInfo, int32_t groupNum) {
   taosArrayClear(pTableListInfo->pGroupList);
   SArray* sortSupport = taosArrayInit(groupNum, sizeof(uint64_t));
@@ -4253,7 +4264,7 @@ SOperatorInfo* createOperatorTree(SPhysiNode* pPhyNode, SExecTaskInfo* pTaskInfo
         return NULL;
       }
 
-      code = extractTableSchemaVersion(pHandle, pTableScanNode->scan.uid, pTaskInfo);
+      code = extractTableSchemaInfo(pHandle, pTableScanNode->scan.uid, pTaskInfo);
       if (code) {
         pTaskInfo->code = terrno;
         return NULL;
@@ -4271,7 +4282,7 @@ SOperatorInfo* createOperatorTree(SPhysiNode* pPhyNode, SExecTaskInfo* pTaskInfo
         pTaskInfo->code = code;
         return NULL;
       }
-      code = extractTableSchemaVersion(pHandle, pTableScanNode->scan.uid, pTaskInfo);
+      code = extractTableSchemaInfo(pHandle, pTableScanNode->scan.uid, pTaskInfo);
       if (code) {
         pTaskInfo->code = terrno;
         return NULL;
@@ -4368,7 +4379,7 @@ SOperatorInfo* createOperatorTree(SPhysiNode* pPhyNode, SExecTaskInfo* pTaskInfo
       //        return NULL;
       //      }
 
-      int32_t code = extractTableSchemaVersion(pHandle, pScanNode->uid, pTaskInfo);
+      int32_t code = extractTableSchemaInfo(pHandle, pScanNode->uid, pTaskInfo);
       if (code != TSDB_CODE_SUCCESS) {
         pTaskInfo->code = code;
         return NULL;
@@ -4867,11 +4878,8 @@ void doDestroyTask(SExecTaskInfo* pTaskInfo) {
 
   doDestroyTableList(&pTaskInfo->tableqinfoList);
   destroyOperatorInfo(pTaskInfo->pRoot);
-  //  taosArrayDestroy(pTaskInfo->summary.queryProfEvents);
-  //  taosHashCleanup(pTaskInfo->summary.operatorProfResults);
+  cleanupTableSchemaInfo(pTaskInfo);
 
-  taosMemoryFree(pTaskInfo->schemaVer.dbname);
-  taosMemoryFree(pTaskInfo->schemaVer.tablename);
   taosMemoryFreeClear(pTaskInfo->sql);
   taosMemoryFreeClear(pTaskInfo->id.str);
   taosMemoryFreeClear(pTaskInfo);
diff --git a/source/libs/qworker/src/qwUtil.c b/source/libs/qworker/src/qwUtil.c
index 5aaf2b80381986ff1120bf527e81d5c537eab834..9c49cbcb1fd2f9cd735a74e6782d3ace298661ee 100644
--- a/source/libs/qworker/src/qwUtil.c
+++ b/source/libs/qworker/src/qwUtil.c
@@ -436,7 +436,7 @@ void qwSaveTbVersionInfo(qTaskInfo_t pTaskInfo, SQWTaskCtx *ctx) {
   char dbFName[TSDB_DB_FNAME_LEN] = {0};
   char tbName[TSDB_TABLE_NAME_LEN] = {0};
 
-  qGetQueriedTableSchemaVersion(pTaskInfo, dbFName, tbName, &ctx->tbInfo.sversion, &ctx->tbInfo.tversion);
+  qGetQueryTableSchemaVersion(pTaskInfo, dbFName, tbName, &ctx->tbInfo.sversion, &ctx->tbInfo.tversion);
 
   if (dbFName[0] && tbName[0]) {
     sprintf(ctx->tbInfo.tbFName, "%s.%s", dbFName, tbName);