fix asan error

source/dnode/mnode/impl/src/mndProfile.c

@@ -842,7 +842,7 @@ static int32_t packQueriesIntoBlock(SShowObj* pShow, SConnObj* pConn, SSDataBloc
     }
     varDataLen(subStatus) = strlen(&subStatus[VARSTR_HEADER_SIZE]);
     pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
-    colDataSetVal(pColInfo, curRowIndex, subStatus, false);
+    colDataSetVal(pColInfo, curRowIndex, subStatus, (varDataLen(subStatus) == 0) ? true : false);
 
     char sql[TSDB_SHOW_SQL_LEN + VARSTR_HEADER_SIZE] = {0};
     STR_TO_VARSTR(sql, pQuery->sql);