## Feature Request - max-min-eliminate - ref: https://docs.pingcap.com/zh/tidb/stable/max-min-eliminate - correlated-subquery-optimization - ref: https://docs.pingcap.com/zh/tidb/stable/subquery-optimization - predicate-pushdown - outer -> inner, ref: [link](https://cn.pingcap.com/blog/tidb-source-code-reading-7/#:~:text=%E9%A6%96%E5%85%88%E4%BC%9A%E5%81%9A%E4%B8%80%E4%B8%AA%E7%AE%80%E5%8C%96%EF%BC%8C%E5%B0%86%E5%B7%A6%E5%A4%96%E8%BF%9E%E6%8E%A5%E5%92%8C%E5%8F%B3%E5%A4%96%E8%BF%9E%E6%8E%A5%E8%BD%AC%E5%8C%96%E4%B8%BA%E5%86%85%E8%BF%9E%E6%8E%A5%E3%80%82) - outer_join_eliminate - ref: https://cn.pingcap.com/blog/tidb-source-code-reading-21/ - aggregation_push_down - ref: https://www.openpie.com/community/blog/1284050105
