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https://issues.apache.org/jira/browse/SPARK-23540?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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KaiXinXIaoLei resolved SPARK-23540.
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Resolution: Duplicate
> The `where exists' action in optimized logical plan should be optimized
> ------------------------------------------------------------------------
>
> Key: SPARK-23540
> URL: https://issues.apache.org/jira/browse/SPARK-23540
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: KaiXinXIaoLei
> Priority: Major
>
> The optimized logical plan of query 'select * from tt1 where exists (select *
> from tt2 where tt1.i = tt2.i);` is :
> >== Optimized Logical Plan ==
> >Join LeftSemi, (i#143 = i#145)
> >:- MetastoreRelation default, tt1
> >+- MetastoreRelation default, tt2
> But the query of `select * from tt1 left semi join tt2 on tt2.i = tt1.i` is :
> >== Optimized Logical Plan ==
> Join LeftSemi, (i#152 = i#150)
> :- Filter isnotnull(i#150)
> : +- MetastoreRelation default, tt1
> +- Project [i#152|#152]
> +- MetastoreRelation default, tt2
>
> So i think the optimized logical plan of 'select * from tt1 where exists
> (select * from tt2 where tt1.i = tt2.i);` should be further optimization.
>
> == Optimized Logical Plan ==
> Join LeftSemi, (i#143 = i#145)
> :- MetastoreRelation default, tt1
> +- MetastoreRelation default, tt2
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