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

src/client/src/tscSQLParser.c

@@ -8195,7 +8195,10 @@ 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)){
+      tfree(pTableMeta);
+      tableMetaCapacity = 0;
+    }
 
     if (pTableMeta && pTableMeta->id.uid > 0) {
       tscDebug("0x%"PRIx64" retrieve table meta %s from local buf", pSql->self, name);

src/client/src/tscServer.c

@@ -2997,7 +2997,10 @@ int32_t tscGetTableMetaImpl(SSqlObj* pSql, STableMetaInfo *pTableMetaInfo, bool
       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);
+    pTableMetaInfo->tableMetaCapacity = 0;
+  }
 
   STableMeta* pMeta = pTableMetaInfo->pTableMeta;
   if (pMeta && pMeta->id.uid > 0) {

src/client/src/tscUtil.c

@@ -4418,7 +4418,9 @@ int32_t tscCreateTableMetaFromSTableMeta(STableMeta** ppChild, const char* name,
   STableMeta* pChild = *ppChild;
   STableMeta* pChild1;
 
-  taosHashGetCloneExt(tscTableMetaMap, pChild->sTableName, strnlen(pChild->sTableName, TSDB_TABLE_FNAME_LEN), NULL, (void **)&p, &sz);
+  if(NULL == taosHashGetCloneExt(tscTableMetaMap, pChild->sTableName, strnlen(pChild->sTableName, TSDB_TABLE_FNAME_LEN), NULL, (void **)&p, &sz)) {
+    tfree(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.