[TD-6317]<fix> forbidden distinct with order by

src/client/src/tscSQLParser.c

@@ -5787,6 +5787,11 @@ static void setDefaultOrderInfo(SQueryInfo* pQueryInfo) {
   if (UTIL_TABLE_IS_SUPER_TABLE(pTableMetaInfo)) {
     pQueryInfo->groupbyExpr.orderType = TSDB_ORDER_ASC;
   }
+
+  if (pQueryInfo->distinct) {
+    pQueryInfo->order.order = TSDB_ORDER_ASC;
+    pQueryInfo->order.orderColId = PRIMARYKEY_TIMESTAMP_COL_INDEX;
+  }
 }
 
 int32_t validateOrderbyNode(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SSqlNode* pSqlNode, SSchema* pSchema) {