diff --git a/src/client/src/tscSubquery.c b/src/client/src/tscSubquery.c
index ca7341d8e91e600d8436acea53f2417241c3d016..f4b6ea2c9454460b8b899b237d9a16364e0be826 100644
--- a/src/client/src/tscSubquery.c
+++ b/src/client/src/tscSubquery.c
@@ -979,27 +979,12 @@ static void joinRetrieveFinalResCallback(void* param, TAOS_RES* tres, int numOfR
   tscBuildResFromSubqueries(pParentSql);
 }
 
-static SJoinSupporter* tscUpdateSubqueryStatus(SSqlObj* pSql, int32_t numOfFetch) {
-  int32_t notInvolved = 0;
-  SSubqueryState* pState = &pSql->subState;
-  
-  for(int32_t i = 0; i < pSql->subState.numOfSub; ++i) {
-    if (pSql->pSubs[i] == NULL) {
-      notInvolved++;
-//    } else {
-//      (SJoinSupporter*)pSql->pSubs[i]->param;
-    }
-  }
-  
-  pState->numOfRemain = numOfFetch;
-  return NULL;
-}
-
 void tscFetchDatablockFromSubquery(SSqlObj* pSql) {
   assert(pSql->subState.numOfSub >= 1);
   
   int32_t numOfFetch = 0;
-  bool hasData = true;
+  bool    hasData = true;
+  bool    reachLimit = false;
 
   // if the subquery is NULL, it does not involved in the final result generation
   for (int32_t i = 0; i < pSql->subState.numOfSub; ++i) {
@@ -1025,7 +1010,8 @@ void tscFetchDatablockFromSubquery(SSqlObj* pSql) {
       }
     } else {  // has reach the limitation, no data anymore
       if (pRes->row >= pRes->numOfRows) {
-        hasData = false;
+        reachLimit = true;
+        hasData    = false;
         break;
       }
     }
@@ -1039,7 +1025,7 @@ void tscFetchDatablockFromSubquery(SSqlObj* pSql) {
 
   // If at least one subquery is completed in current vnode, try the next vnode in case of multi-vnode
   // super table projection query.
-  if (numOfFetch <= 0) {
+  if (numOfFetch <= 0 && !reachLimit) {
     bool tryNextVnode = false;
 
     SSqlObj* pp = pSql->pSubs[0];
@@ -1109,8 +1095,8 @@ void tscFetchDatablockFromSubquery(SSqlObj* pSql) {
   // retrieve data from current vnode.
   tscDebug("%p retrieve data from %d subqueries", pSql, numOfFetch);
   SJoinSupporter* pSupporter = NULL;
-  tscUpdateSubqueryStatus(pSql, numOfFetch);
-  
+  pSql->subState.numOfRemain = numOfFetch;
+
   for (int32_t i = 0; i < pSql->subState.numOfSub; ++i) {
     SSqlObj* pSql1 = pSql->pSubs[i];
     if (pSql1 == NULL) {
@@ -1522,7 +1508,13 @@ int32_t tscHandleMasterSTableQuery(SSqlObj *pSql) {
   STableMetaInfo *pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
   SSubqueryState *pState = &pSql->subState;
 
-  pState->numOfSub = pTableMetaInfo->vgroupList->numOfVgroups;
+  pState->numOfSub = 0;
+  if (pTableMetaInfo->pVgroupTables == NULL) {
+    pState->numOfSub = pTableMetaInfo->vgroupList->numOfVgroups;
+  } else {
+    pState->numOfSub = taosArrayGetSize(pTableMetaInfo->pVgroupTables);
+  }
+
   assert(pState->numOfSub > 0);
   
   int32_t ret = tscLocalReducerEnvCreate(pSql, &pMemoryBuf, &pDesc, &pModel, nBufferSize);
diff --git a/src/common/src/tvariant.c b/src/common/src/tvariant.c
index e2447444014bc5ddb19dd82d703f19003ddd79f9..5c5cda3b5d7411e51bb2adb008ed8671ae778537 100644
--- a/src/common/src/tvariant.c
+++ b/src/common/src/tvariant.c
@@ -145,8 +145,9 @@ void tVariantAssign(tVariant *pDst, const tVariant *pSrc) {
   if (pSrc == NULL || pDst == NULL) return;
   
   pDst->nType = pSrc->nType;
-
-  if (pSrc->nType == TSDB_DATA_TYPE_BINARY || pSrc->nType == TSDB_DATA_TYPE_NCHAR) {
+  if (pSrc->nType >= TSDB_DATA_TYPE_BOOL && pSrc->nType <= TSDB_DATA_TYPE_DOUBLE) {
+    pDst->i64Key = pSrc->i64Key;
+  } else if (pSrc->nType == TSDB_DATA_TYPE_BINARY || pSrc->nType == TSDB_DATA_TYPE_NCHAR) {
     int32_t len = pSrc->nLen + TSDB_NCHAR_SIZE;
     char* p = realloc(pDst->pz, len);
     assert(p);
@@ -156,11 +157,7 @@ void tVariantAssign(tVariant *pDst, const tVariant *pSrc) {
 
     memcpy(pDst->pz, pSrc->pz, pSrc->nLen);
     pDst->nLen = pSrc->nLen;
-    return;
-  }
-
-  // this is only for string array
-  if (pSrc->nType == TSDB_DATA_TYPE_ARRAY) {
+  } else if (pSrc->nType == TSDB_DATA_TYPE_ARRAY) {  // this is only for string array
     size_t num = taosArrayGetSize(pSrc->arr);
     pDst->arr = taosArrayInit(num, sizeof(char*));
     for(size_t i = 0; i < num; i++) {
@@ -168,8 +165,6 @@ void tVariantAssign(tVariant *pDst, const tVariant *pSrc) {
       char* n = strdup(p);
       taosArrayPush(pDst->arr, &n);
     }
-
-    return;
   }
 
   pDst->nLen = tDataTypeDesc[pDst->nType].nSize;
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 2aca661a6a96b2cc05121a6c707d8d6b85c11e83..3812cd31f6617e1a8fb889889624eac56885440f 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -4767,36 +4767,61 @@ static bool multiTableMultioutputHelper(SQInfo *pQInfo, int32_t index) {
   }
 
   if (pRuntimeEnv->pTSBuf != NULL) {
+      tVariant* pTag = &pRuntimeEnv->pCtx[0].tag;
+
     if (pRuntimeEnv->cur.vgroupIndex == -1) {
-      STSElem elem = tsBufGetElemStartPos(pRuntimeEnv->pTSBuf, pQInfo->vgId, &pRuntimeEnv->pCtx[0].tag);
+      STSElem elem = tsBufGetElemStartPos(pRuntimeEnv->pTSBuf, pQInfo->vgId, pTag);
       // failed to find data with the specified tag value and vnodeId
       if (elem.vnode < 0) {
-        qError("QInfo:%p failed to find tag:%s in ts_comp", pQInfo, pRuntimeEnv->pCtx[0].tag.pz);
+        if (pTag->nType == TSDB_DATA_TYPE_BINARY || pTag->nType == TSDB_DATA_TYPE_NCHAR) {
+          qError("QInfo:%p failed to find tag:%s in ts_comp", pQInfo, pTag->pz);
+        } else {
+          qError("QInfo:%p failed to find tag:%"PRId64" in ts_comp", pQInfo, pTag->i64Key);
+        }
+
         return false;
       } else {
         STSCursor cur = tsBufGetCursor(pRuntimeEnv->pTSBuf);
-        qDebug("QInfo:%p find tag:%s start pos in ts_comp, blockIndex:%d, tsIndex:%d", pQInfo, pRuntimeEnv->pCtx[0].tag.pz,
-            cur.blockIndex, cur.tsIndex);
+
+        if (pTag->nType == TSDB_DATA_TYPE_BINARY || pTag->nType == TSDB_DATA_TYPE_NCHAR) {
+          qDebug("QInfo:%p find tag:%s start pos in ts_comp, blockIndex:%d, tsIndex:%d", pQInfo, pTag->pz,
+                 cur.blockIndex, cur.tsIndex);
+        } else {
+          qDebug("QInfo:%p find tag:%"PRId64" start pos in ts_comp, blockIndex:%d, tsIndex:%d", pQInfo, pTag->i64Key,
+                 cur.blockIndex, cur.tsIndex);
+        }
+
+
       }
     } else {
       STSElem elem = tsBufGetElem(pRuntimeEnv->pTSBuf);
       if (tVariantCompare(&elem.tag, &pRuntimeEnv->pCtx[0].tag) != 0) {
 
-        STSElem elem1 = tsBufGetElemStartPos(pRuntimeEnv->pTSBuf, pQInfo->vgId, &pRuntimeEnv->pCtx[0].tag);
+        STSElem elem1 = tsBufGetElemStartPos(pRuntimeEnv->pTSBuf, pQInfo->vgId, pTag);
         // failed to find data with the specified tag value and vnodeId
         if (elem1.vnode < 0) {
-          qError("QInfo:%p failed to find tag:%s in ts_comp", pQInfo, pRuntimeEnv->pCtx[0].tag.pz);
+          if (pTag->nType == TSDB_DATA_TYPE_BINARY || pTag->nType == TSDB_DATA_TYPE_NCHAR) {
+            qError("QInfo:%p failed to find tag:%s in ts_comp", pQInfo, pTag->pz);
+          } else {
+            qError("QInfo:%p failed to find tag:%"PRId64" in ts_comp", pQInfo, pTag->i64Key);
+          }
           return false;
         } else {
           STSCursor cur = tsBufGetCursor(pRuntimeEnv->pTSBuf);
-          qDebug("QInfo:%p find tag:%s start pos in ts_comp, blockIndex:%d, tsIndex:%d", pQInfo, pRuntimeEnv->pCtx[0].tag.pz,
-                 cur.blockIndex, cur.tsIndex);
+          if (pTag->nType == TSDB_DATA_TYPE_BINARY || pTag->nType == TSDB_DATA_TYPE_NCHAR) {
+            qDebug("QInfo:%p find tag:%s start pos in ts_comp, blockIndex:%d, tsIndex:%d", pQInfo, pTag->pz, cur.blockIndex, cur.tsIndex);
+          } else {
+            qDebug("QInfo:%p find tag:%"PRId64" start pos in ts_comp, blockIndex:%d, tsIndex:%d", pQInfo, pTag->i64Key, cur.blockIndex, cur.tsIndex);
+          }
         }
       } else {
         tsBufSetCursor(pRuntimeEnv->pTSBuf, &pRuntimeEnv->cur);
         STSCursor cur = tsBufGetCursor(pRuntimeEnv->pTSBuf);
-        qDebug("QInfo:%p continue scan ts_comp file, tag:%s blockIndex:%d, tsIndex:%d", pQInfo, pRuntimeEnv->pCtx[0].tag.pz,
-               cur.blockIndex, cur.tsIndex);
+        if (pTag->nType == TSDB_DATA_TYPE_BINARY || pTag->nType == TSDB_DATA_TYPE_NCHAR) {
+          qDebug("QInfo:%p continue scan ts_comp file, tag:%s blockIndex:%d, tsIndex:%d", pQInfo, pTag->pz, cur.blockIndex, cur.tsIndex);
+        } else {
+          qDebug("QInfo:%p continue scan ts_comp file, tag:%"PRId64" blockIndex:%d, tsIndex:%d", pQInfo, pTag->i64Key, cur.blockIndex, cur.tsIndex);
+        }
       }
 
     }