大佬，请教1个问题 ，安装官网对于子查询的优化
子查询 select * from t1 where t1.a in (select t2.a from t2) 会被改写为 select t1.* from t1, (select distinct(a) a from t2) t2 where t1.a = t2.a
select * from t1 where t1.a in (select t2.a from t2)
select t1.* from t1, (select distinct(a) a from t2) t2 where t1.a = t2.a
那么t2只能当驱动表？不能当被驱动表？我觉得应该可以把，我记得MySQL可以
