[TD-3747]

src/client/inc/tsclient.h

@@ -83,6 +83,7 @@ typedef struct STableMeta {
 
 typedef struct STableMetaInfo {
   STableMeta   *pTableMeta;      // table meta, cached in client side and acquired by name
+  uint32_t       tableMetaSize;
   SVgroupsInfo *vgroupList;
   SArray       *pVgroupTables;   // SArray<SVgroupTableInfo>
   

src/client/src/tscServer.c

@@ -2533,6 +2533,11 @@ int32_t tscGetTableMeta(SSqlObj *pSql, STableMetaInfo *pTableMetaInfo) {
   uint32_t size = tscGetTableMetaMaxSize();
   if (pTableMetaInfo->pTableMeta == NULL) {
     pTableMetaInfo->pTableMeta = calloc(1, size);
+  } else if (pTableMetaInfo->tableMetaSize < size) {
+    char *tmp = realloc(pTableMetaInfo->pTableMeta, size); 
+    if (tmp == NULL) { return TSDB_CODE_TSC_OUT_OF_MEMORY;}
+    pTableMetaInfo->pTableMeta = (STableMeta *)tmp;
+    pTableMetaInfo->tableMetaSize = size;
   } else {
     uint32_t s = tscGetTableMetaSize(pTableMetaInfo->pTableMeta);
     memset(pTableMetaInfo->pTableMeta, 0, s);

src/client/src/tscUtil.c

@@ -694,6 +694,7 @@ int32_t tscCopyDataBlockToPayload(SSqlObj* pSql, STableDataBlocks* pDataBlock) {
     }
 
     pTableMetaInfo->pTableMeta    = tscTableMetaDup(pDataBlock->pTableMeta);
+    pTableMetaInfo->tableMetaSize = tscGetTableMetaSize(pDataBlock->pTableMeta); 
   }
 
   /*
@@ -2078,6 +2079,7 @@ STableMetaInfo* tscAddTableMetaInfo(SQueryInfo* pQueryInfo, SName* name, STableM
   }
 
   pTableMetaInfo->pTableMeta = pTableMeta;
+  pTableMetaInfo->tableMetaSize = tscGetTableMetaSize(pTableMeta);
   
   if (vgroupList != NULL) {
     pTableMetaInfo->vgroupList = tscVgroupInfoClone(vgroupList);
@@ -2352,6 +2354,7 @@ SSqlObj* createSubqueryObj(SSqlObj* pSql, int16_t tableIndex, __async_cb_func_t
 
     pFinalInfo = tscAddTableMetaInfo(pNewQueryInfo, &pTableMetaInfo->name, pTableMeta, pTableMetaInfo->vgroupList,
                                      pTableMetaInfo->tagColList, pTableMetaInfo->pVgroupTables);
+    
   } else {  // transfer the ownership of pTableMeta to the newly create sql object.
     STableMetaInfo* pPrevInfo = tscGetTableMetaInfoFromCmd(&pPrevSql->cmd, pPrevSql->cmd.clauseIndex, 0);
     if (pPrevInfo->pTableMeta && pPrevInfo->pTableMeta->tableType < 0) {