数据量业务大的话可考虑用 tiflash 下推
mysql> show warnings;
±--------±-----±------------------------------------------------------------------------------------------+
| Level | Code | Message |
±--------±-----±------------------------------------------------------------------------------------------+
| Warning | 1105 | Aggregation can not be pushed to tikv because AggFunc group_concat is not supported now |
±--------±-----±------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)