diff --git a/src/client/src/tscAsync.c b/src/client/src/tscAsync.c
index 9f207936df234ec87a5f8e9c74b6aa2e3ef0db3e..813c4561524d03456101f2ac0687ba3b0b095820 100644
--- a/src/client/src/tscAsync.c
+++ b/src/client/src/tscAsync.c
@@ -425,6 +425,11 @@ void tscTableMetaCallBack(void *param, TAOS_RES *res, int code) {
   
     if ((pQueryInfo->type & TSDB_QUERY_TYPE_STABLE_SUBQUERY) == TSDB_QUERY_TYPE_STABLE_SUBQUERY) {
       STableMetaInfo* pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
+      if (pTableMetaInfo->pTableMeta == NULL){
+        code = tscGetTableMeta(pSql, pTableMetaInfo);
+        assert(code == TSDB_CODE_SUCCESS);      
+      }     
+      
       assert((tscGetNumOfTags(pTableMetaInfo->pTableMeta) != 0) && pTableMetaInfo->vgroupIndex >= 0 && pSql->param != NULL);
 
       SRetrieveSupport *trs = (SRetrieveSupport *)pSql->param;
@@ -433,12 +438,7 @@ void tscTableMetaCallBack(void *param, TAOS_RES *res, int code) {
       assert(pParObj->signature == pParObj && trs->subqueryIndex == pTableMetaInfo->vgroupIndex &&
           tscGetNumOfTags(pTableMetaInfo->pTableMeta) != 0);
 
-      tscTrace("%p get metricMeta during super table query successfully", pSql);
-      
-      code = tscGetTableMeta(pSql, pTableMetaInfo);
-      pRes->code = code;
-
-      if (code == TSDB_CODE_ACTION_IN_PROGRESS) return;
+      tscTrace("%p get metricMeta during super table query successfully", pSql);      
 
       code = tscGetSTableVgroupInfo(pSql, 0);
       pRes->code = code;
diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index 171d40b932e2570affeb4e42b27deaece7c9731a..42c537eb0cfceebd095e04483a84fec6d67fb5ae 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -391,9 +391,11 @@ void tscPartiallyFreeSqlObj(SSqlObj* pSql) {
   }
   
   // pSql->sqlstr will be used by tscBuildQueryStreamDesc
-  pthread_mutex_lock(&pObj->mutex);
-  tfree(pSql->sqlstr);
-  pthread_mutex_unlock(&pObj->mutex);
+  if (pObj->signature == pObj) {
+    pthread_mutex_lock(&pObj->mutex);
+    tfree(pSql->sqlstr);
+    pthread_mutex_unlock(&pObj->mutex);
+  }
   
   tscFreeSqlResult(pSql);
   
@@ -1864,7 +1866,14 @@ SSqlObj* createSubqueryObj(SSqlObj* pSql, int16_t tableIndex, void (*fp)(), void
     pFinalInfo = tscAddTableMetaInfo(pNewQueryInfo, name, pPrevTableMeta, pVgroupsInfo, pTableMetaInfo->tagColList);
   }
 
-  assert(pFinalInfo->pTableMeta != NULL && pNewQueryInfo->numOfTables == 1);
+  if (pFinalInfo->pTableMeta == NULL) {
+    tscError("%p new subquery failed for get pMeterMeta is NULL from cache", pSql);
+    tscFreeSqlObj(pNew);
+    return NULL;
+  }
+  
+  assert(pNewQueryInfo->numOfTables == 1);
+  
   if (UTIL_TABLE_IS_SUPERTABLE(pTableMetaInfo)) {
     assert(pFinalInfo->vgroupList != NULL);
   }
diff --git a/src/util/src/tcache.c b/src/util/src/tcache.c
index 02a5b931412c874d54dc3bb99e28574340e385d5..c715d06a703729025160ff6dcee79009a989c5bd 100644
--- a/src/util/src/tcache.c
+++ b/src/util/src/tcache.c
@@ -439,6 +439,8 @@ void *taosCachePut(SCacheObj *pCacheObj, const char *key, const void *pData, siz
       
       uTrace("key:%s %p added into cache, added:%" PRIu64 ", expire:%" PRIu64 ", total:%d, size:%" PRId64 " bytes",
              key, pNode, pNode->addedTime, pNode->expiredTime, pCacheObj->totalSize, dataSize);
+    } else {
+      uError("key:%s failed to added into cache, out of memory", key);
     }
   } else {  // old data exists, update the node
     pNode = taosUpdateCacheImpl(pCacheObj, pOld, key, keyLen, pData, dataSize, duration * 1000L);