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From "KaiXinXIaoLei (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SPARK-23540) The `where exists' action in optimized logical plan should be optimized
Date Thu, 01 Mar 2018 02:59:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-23540?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

KaiXinXIaoLei resolved SPARK-23540.
-----------------------------------
    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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