tangenta
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tangenta
The problem happens when PDD(predicate-push-down) optimizer trying to substitute `a.abc` in where clause with `ifnull(t2.b,t1.a)`, for example: ```sql select * from (select ifnull(t2.b,t1.a) abc from t1 left join t2 on...
Need to cherry-pick https://github.com/pingcap/tidb/pull/34538 as well.
We may need to update https://docs.pingcap.com/zh/tidb/dev/mysql-schema as well.
All the changes are merged to the master.
/hold because the config is not decided yet.