diff --git a/include/client/taos.h b/include/client/taos.h
index 669512e9b12d7c6a4608dcc1791526667e12dc80..651faf5dcc6ece553eff3f3c9177e4cffc5740a3 100644
--- a/include/client/taos.h
+++ b/include/client/taos.h
@@ -163,6 +163,7 @@ DLL_EXPORT TAOS_RES *taos_query(TAOS *taos, const char *sql);
 DLL_EXPORT TAOS_ROW taos_fetch_row(TAOS_RES *res);
 DLL_EXPORT int      taos_result_precision(TAOS_RES *res);  // get the time precision of result
 DLL_EXPORT void     taos_free_result(TAOS_RES *res);
+DLL_EXPORT void     taos_kill_query(TAOS *taos);
 DLL_EXPORT int      taos_field_count(TAOS_RES *res);
 DLL_EXPORT int      taos_num_fields(TAOS_RES *res);
 DLL_EXPORT int      taos_affected_rows(TAOS_RES *res);
diff --git a/source/client/inc/clientInt.h b/source/client/inc/clientInt.h
index 9225d671315723038cb61a0f21735103c3a64466..3b21258fe1a3080400c055ff7a0f0d5a122054b2 100644
--- a/source/client/inc/clientInt.h
+++ b/source/client/inc/clientInt.h
@@ -338,6 +338,7 @@ int  hbHandleRsp(SClientHbBatchRsp* hbRsp);
 SAppHbMgr* appHbMgrInit(SAppInstInfo* pAppInstInfo, char* key);
 void       appHbMgrCleanup(void);
 void       hbRemoveAppHbMrg(SAppHbMgr **pAppHbMgr);
+void       closeAllRequests(SHashObj *pRequests);
 
 // conn level
 int  hbRegisterConn(SAppHbMgr* pAppHbMgr, int64_t tscRefId, int64_t clusterId, int8_t connType);
diff --git a/source/client/src/clientHb.c b/source/client/src/clientHb.c
index 4f4bb83fe5b0fe3d8ba0143be46790d7b9674e0c..43e83dd50146ec15f110eea04f49cd0c32a2952f 100644
--- a/source/client/src/clientHb.c
+++ b/source/client/src/clientHb.c
@@ -66,25 +66,31 @@ static int32_t hbProcessDBInfoRsp(void *value, int32_t valueLen, struct SCatalog
     if (rsp->vgVersion < 0) {
       code = catalogRemoveDB(pCatalog, rsp->db, rsp->uid);
     } else {
-      SDBVgInfo vgInfo = {0};
-      vgInfo.vgVersion = rsp->vgVersion;
-      vgInfo.hashMethod = rsp->hashMethod;
-      vgInfo.vgHash = taosHashInit(rsp->vgNum, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), true, HASH_ENTRY_LOCK);
-      if (NULL == vgInfo.vgHash) {
+      SDBVgInfo *vgInfo = taosMemoryCalloc(1, sizeof(SDBVgInfo));
+      if (NULL == vgInfo) {
+        return TSDB_CODE_TSC_OUT_OF_MEMORY;
+      }
+      
+      vgInfo->vgVersion = rsp->vgVersion;
+      vgInfo->hashMethod = rsp->hashMethod;
+      vgInfo->vgHash = taosHashInit(rsp->vgNum, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), true, HASH_ENTRY_LOCK);
+      if (NULL == vgInfo->vgHash) {
+        taosMemoryFree(vgInfo);
         tscError("hash init[%d] failed", rsp->vgNum);
         return TSDB_CODE_TSC_OUT_OF_MEMORY;
       }
 
       for (int32_t j = 0; j < rsp->vgNum; ++j) {
         SVgroupInfo *pInfo = taosArrayGet(rsp->pVgroupInfos, j);
-        if (taosHashPut(vgInfo.vgHash, &pInfo->vgId, sizeof(int32_t), pInfo, sizeof(SVgroupInfo)) != 0) {
+        if (taosHashPut(vgInfo->vgHash, &pInfo->vgId, sizeof(int32_t), pInfo, sizeof(SVgroupInfo)) != 0) {
           tscError("hash push failed, errno:%d", errno);
-          taosHashCleanup(vgInfo.vgHash);
+          taosHashCleanup(vgInfo->vgHash);
+          taosMemoryFree(vgInfo);
           return TSDB_CODE_TSC_OUT_OF_MEMORY;
         }
       }
 
-      catalogUpdateDBVgInfo(pCatalog, rsp->db, rsp->uid, &vgInfo);
+      catalogUpdateDBVgInfo(pCatalog, rsp->db, rsp->uid, vgInfo);
     }
 
     if (code) {
diff --git a/source/client/src/clientMain.c b/source/client/src/clientMain.c
index a24e6faf7fae8f368fc30cedb139b9e0775a390b..be3efe0f98a26f23720d94539f49e2a5f1667a80 100644
--- a/source/client/src/clientMain.c
+++ b/source/client/src/clientMain.c
@@ -181,6 +181,17 @@ void taos_free_result(TAOS_RES *res) {
   }
 }
 
+void taos_kill_query(TAOS *taos) {
+  if (NULL == taos) {
+    return;
+  }
+  int64_t rid = *(int64_t*)taos;
+  
+  STscObj* pTscObj = acquireTscObj(rid);
+  closeAllRequests(pTscObj->pRequests);
+  releaseTscObj(rid);
+}
+
 int taos_field_count(TAOS_RES *res) {
   if (res == NULL || TD_RES_TMQ_META(res)) {
     return 0;
diff --git a/source/dnode/mnode/impl/src/mndMain.c b/source/dnode/mnode/impl/src/mndMain.c
index 4c9974ba1a9e0d3346cd9e5b2f00406837db4b97..e03f82ba18b999cbc5e33328dd5e3097fd6f8ade 100644
--- a/source/dnode/mnode/impl/src/mndMain.c
+++ b/source/dnode/mnode/impl/src/mndMain.c
@@ -527,6 +527,11 @@ int32_t mndProcessSyncMsg(SRpcMsg *pMsg) {
 
 static int32_t mndCheckMnodeState(SRpcMsg *pMsg) {
   if (!IsReq(pMsg)) return 0;
+  if (pMsg->msgType == TDMT_VND_QUERY || pMsg->msgType == TDMT_VND_QUERY_CONTINUE ||
+      pMsg->msgType == TDMT_VND_QUERY_HEARTBEAT || pMsg->msgType == TDMT_VND_FETCH ||
+      pMsg->msgType == TDMT_VND_DROP_TASK) {
+    return 0;
+  }
   if (mndAcquireRpcRef(pMsg->info.node) == 0) return 0;
   if (pMsg->msgType == TDMT_MND_MQ_TIMER || pMsg->msgType == TDMT_MND_TELEM_TIMER ||
       pMsg->msgType == TDMT_MND_TRANS_TIMER || pMsg->msgType == TDMT_MND_TTL_TIMER) {
diff --git a/source/libs/catalog/src/ctgAsync.c b/source/libs/catalog/src/ctgAsync.c
index 139539821c34673391622831578a00e212bc8fe1..683cbdb47c7fea6a15d044124979eaf99adba063 100644
--- a/source/libs/catalog/src/ctgAsync.c
+++ b/source/libs/catalog/src/ctgAsync.c
@@ -789,8 +789,6 @@ _return:
 
 int32_t ctgCallUserCb(void* param) {
   SCtgJob* pJob = (SCtgJob*)param;
-
-  //taosSsleep(2);
   
   (*pJob->userFp)(&pJob->jobRes, pJob->userParam, pJob->jobResCode);
 
@@ -827,6 +825,9 @@ _return:
   qDebug("QID:0x%" PRIx64 " ctg call user callback with rsp %s", pJob->queryId, tstrerror(code));
 
   pJob->jobResCode = code;
+
+  taosSsleep(2);
+  qDebug("QID:0x%" PRIx64 " ctg after sleep", pJob->queryId);
   
   taosAsyncExec(ctgCallUserCb, pJob, NULL);
   
diff --git a/source/libs/catalog/src/ctgCache.c b/source/libs/catalog/src/ctgCache.c
index 8cd6c7d203aac7b928b630e2a1d16aa41034673a..301cdbef20142d3c08408f3fc9b1e6fc56170f8e 100644
--- a/source/libs/catalog/src/ctgCache.c
+++ b/source/libs/catalog/src/ctgCache.c
@@ -1564,27 +1564,27 @@ int32_t ctgOpUpdateVgroup(SCtgCacheOperation *operation) {
   SCatalog* pCtg = msg->pCtg;
   
   if (NULL == dbInfo->vgHash) {
-    return TSDB_CODE_SUCCESS;
+    goto _return;
   }
   
   if (dbInfo->vgVersion < 0 || taosHashGetSize(dbInfo->vgHash) <= 0) {
     ctgError("invalid db vgInfo, dbFName:%s, vgHash:%p, vgVersion:%d, vgHashSize:%d", 
              dbFName, dbInfo->vgHash, dbInfo->vgVersion, taosHashGetSize(dbInfo->vgHash));
-    CTG_ERR_RET(TSDB_CODE_OUT_OF_MEMORY);
+    CTG_ERR_JRET(TSDB_CODE_APP_ERROR);
   }
 
   bool newAdded = false;
   SDbVgVersion vgVersion = {.dbId = msg->dbId, .vgVersion = dbInfo->vgVersion, .numOfTable = dbInfo->numOfTable};
 
   SCtgDBCache *dbCache = NULL;
-  CTG_ERR_RET(ctgGetAddDBCache(msg->pCtg, dbFName, msg->dbId, &dbCache));
+  CTG_ERR_JRET(ctgGetAddDBCache(msg->pCtg, dbFName, msg->dbId, &dbCache));
   if (NULL == dbCache) {
     ctgInfo("conflict db update, ignore this update, dbFName:%s, dbId:0x%"PRIx64, dbFName, msg->dbId);
-    CTG_ERR_RET(TSDB_CODE_CTG_INTERNAL_ERROR);
+    CTG_ERR_JRET(TSDB_CODE_CTG_INTERNAL_ERROR);
   }
 
   SCtgVgCache *vgCache = &dbCache->vgCache;
-  CTG_ERR_RET(ctgWLockVgInfo(msg->pCtg, dbCache));
+  CTG_ERR_JRET(ctgWLockVgInfo(msg->pCtg, dbCache));
   
   if (vgCache->vgInfo) {
     SDBVgInfo *vgInfo = vgCache->vgInfo;
@@ -1593,14 +1593,14 @@ int32_t ctgOpUpdateVgroup(SCtgCacheOperation *operation) {
       ctgDebug("db vgVer is old, dbFName:%s, vgVer:%d, curVer:%d", dbFName, dbInfo->vgVersion, vgInfo->vgVersion);
       ctgWUnlockVgInfo(dbCache);
       
-      return TSDB_CODE_SUCCESS;
+      goto _return;
     }
 
     if (dbInfo->vgVersion == vgInfo->vgVersion && dbInfo->numOfTable == vgInfo->numOfTable) {
       ctgDebug("no new db vgVer or numOfTable, dbFName:%s, vgVer:%d, numOfTable:%d", dbFName, dbInfo->vgVersion, dbInfo->numOfTable);
       ctgWUnlockVgInfo(dbCache);
       
-      return TSDB_CODE_SUCCESS;
+      goto _return;
     }
 
     ctgFreeVgInfo(vgInfo);
diff --git a/source/libs/scalar/src/scalar.c b/source/libs/scalar/src/scalar.c
index 75a9bc3809632f88601f8628add9aed4b8365cf4..cef8ff707564558835c57cefb59515858d2e2688 100644
--- a/source/libs/scalar/src/scalar.c
+++ b/source/libs/scalar/src/scalar.c
@@ -936,6 +936,25 @@ EDealRes sclCalcWalker(SNode* pNode, void* pContext) {
   return DEAL_RES_ERROR;
 }
 
+int32_t sclExtendResRows(SScalarParam *pDst, SScalarParam *pSrc, SArray *pBlockList) {
+  SSDataBlock* pb = taosArrayGetP(pBlockList, 0);
+  SScalarParam *pLeft = taosMemoryCalloc(1, sizeof(SScalarParam));
+  if (NULL == pLeft) {
+    sclError("calloc %d failed", (int32_t)sizeof(SScalarParam));
+    SCL_ERR_RET(TSDB_CODE_QRY_OUT_OF_MEMORY);
+  }
+
+  pLeft->numOfRows = pb->info.rows;
+  colInfoDataEnsureCapacity(pDst->columnData, pb->info.rows);
+
+  _bin_scalar_fn_t OperatorFn = getBinScalarOperatorFn(OP_TYPE_ASSIGN);
+  OperatorFn(pLeft, pSrc, pDst, TSDB_ORDER_ASC);
+
+  taosMemoryFree(pLeft);
+
+  return TSDB_CODE_SUCCESS;
+}
+
 int32_t scalarCalculateConstants(SNode *pNode, SNode **pRes) {
   if (NULL == pNode) {
     SCL_ERR_RET(TSDB_CODE_QRY_INVALID_INPUT);
@@ -983,9 +1002,14 @@ int32_t scalarCalculate(SNode *pNode, SArray *pBlockList, SScalarParam *pDst) {
       SCL_ERR_JRET(TSDB_CODE_QRY_APP_ERROR);
     }
 
-    colInfoDataEnsureCapacity(pDst->columnData, res->numOfRows);
-    colDataAssign(pDst->columnData, res->columnData, res->numOfRows, NULL);
-    pDst->numOfRows = res->numOfRows;
+    if (1 == res->numOfRows) {
+      SCL_ERR_JRET(sclExtendResRows(pDst, res, pBlockList));
+    } else {
+      colInfoDataEnsureCapacity(pDst->columnData, res->numOfRows);
+      colDataAssign(pDst->columnData, res->columnData, res->numOfRows, NULL);
+      pDst->numOfRows = res->numOfRows;
+    }
+    
     taosHashRemove(ctx.pRes, (void *)&pNode, POINTER_BYTES);
   }
 
diff --git a/tests/script/api/stopquery.c b/tests/script/api/stopquery.c
index 0008aa3303d9a6cb377323791f31cdbdc755a95e..addd1272cfa8078d8dc527ac1b2a58e40c4e0dba 100644
--- a/tests/script/api/stopquery.c
+++ b/tests/script/api/stopquery.c
@@ -36,7 +36,7 @@ int64_t st, et;
 char hostName[128];
 char dbName[128];
 char tbName[128];
-int32_t runTimes = 10000;
+int32_t runTimes = 1;
 
 typedef struct {
   int       id;
@@ -367,8 +367,8 @@ void *closeThreadFp(void *arg) {
   SSP_CB_PARAM* qParam = (SSP_CB_PARAM*)arg;
   while (true) {
     if (qParam->taos) {
-      usleep(rand() % 10000);
-      //usleep(1000000);
+      //usleep(rand() % 10000);
+      usleep(1000000);
       taos_close(qParam->taos);
       break;
     }