francis0407 commented on issue #23783: [SPARK-26854][SQL] Support ANY/SOME subquery URL: https://github.com/apache/spark/pull/23783#issuecomment-478214322 Recently, I read some papers about subquery optimization. It seems that there is still a lot work to do in Spark SQL. And I will focus on this. Indeed, the basic goal of this PR is to introduce the class `PredicateSubquery`, so that we can use it for further optimization such as 'support subquery in project', 'use subplan to evaluate non-correlated subquery instead of join', 'support nested correlated subquery'. Do you have any suggestion? cc @maropu and @dongjoon-hyun
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