[TD-6308]<fix> partial loaded table meta cause unexpected result

src/client/src/tscSQLParser.c

@@ -8477,7 +8477,10 @@ int32_t loadAllTableMeta(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
     size_t len = strlen(name);
       
-    taosHashGetCloneExt(tscTableMetaMap, name, len, NULL,  (void **)&pTableMeta, &tableMetaCapacity);
+    if (NULL == taosHashGetCloneExt(tscTableMetaMap, name, len, NULL,  (void **)&pTableMeta, &tableMetaCapacity)) {
+      // not found
+      tfree(pTableMeta);
+    }
 
     if (pTableMeta && pTableMeta->id.uid > 0) {
       tscDebug("0x%"PRIx64" retrieve table meta %s from local buf", pSql->self, name);

src/client/src/tscServer.c

@@ -2951,7 +2951,9 @@ int32_t tscGetTableMetaImpl(SSqlObj* pSql, STableMetaInfo *pTableMetaInfo, bool
   if (pTableMetaInfo->tableMetaCapacity != 0 && pTableMetaInfo->pTableMeta != NULL) {
     memset(pTableMetaInfo->pTableMeta, 0, pTableMetaInfo->tableMetaCapacity);
   } 
-  taosHashGetCloneExt(tscTableMetaMap, name, len, NULL, (void **)&(pTableMetaInfo->pTableMeta), &pTableMetaInfo->tableMetaCapacity);
+  if (NULL == taosHashGetCloneExt(tscTableMetaMap, name, len, NULL, (void **)&(pTableMetaInfo->pTableMeta), &pTableMetaInfo->tableMetaCapacity)) {
+    tfree(pTableMetaInfo->pTableMeta); 
+  } 
   
   STableMeta* pMeta   = pTableMetaInfo->pTableMeta;
   STableMeta* pSTMeta = (STableMeta *)(pSql->pBuf);

src/client/src/tscUtil.c

@@ -4469,8 +4469,11 @@ int32_t tscCreateTableMetaFromSTableMeta(STableMeta** ppChild, const char* name,
   if (p != NULL && sz != 0) {
     memset((char *)p, 0, sz);
   }
-  taosHashGetCloneExt(tscTableMetaMap, pChild->sTableName, strnlen(pChild->sTableName, TSDB_TABLE_FNAME_LEN), NULL, (void **)&p, &sz);
-  *ppSTable = p; 
+  if (NULL == taosHashGetCloneExt(tscTableMetaMap, pChild->sTableName, strnlen(pChild->sTableName, TSDB_TABLE_FNAME_LEN), NULL, (void **)&p, &sz)) {
+    tfree(p);
+  } else {
+    *ppSTable = p; 
+  }
 
   // tableMeta exists, build child table meta according to the super table meta
   // the uid need to be checked in addition to the general name of the super table.