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https://issues.apache.org/jira/browse/SPARK-23542?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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KaiXinXIaoLei updated SPARK-23542:
----------------------------------
Description:
The optimized logical plan of query 'select * from tt1 where exists (select *
from tt2 where tt1.i = tt2.i)' is :
{noformat}
== Optimized Logical Plan ==
Join LeftSemi, (i#22 = i#20)
:- Filter isnotnull(i#20)
: +- HiveTableRelation `default`.`tt1`,
org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [i#20, s#21]
+- Project [i#22]
+- HiveTableRelation `default`.`tt2`,
org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [i#22, s#23]{noformat}
>== 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 :
{code:java}
== Optimized Logical Plan ==
Join LeftSemi, (i#22 = i#20)
:- Filter isnotnull(i#20)
: +- HiveTableRelation `default`.`tt1`,
org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [i#20, s#21]
+- Project [i#22]
+- HiveTableRelation `default`.`tt2`,
org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [i#22, s#23]
{code}
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.
was:
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.
> The `where exists' action in optimized logical plan should be optimized
> ------------------------------------------------------------------------
>
> Key: SPARK-23542
> URL: https://issues.apache.org/jira/browse/SPARK-23542
> 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 :
>
> {noformat}
> == Optimized Logical Plan ==
> Join LeftSemi, (i#22 = i#20)
> :- Filter isnotnull(i#20)
> : +- HiveTableRelation `default`.`tt1`,
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [i#20, s#21]
> +- Project [i#22]
> +- HiveTableRelation `default`.`tt2`,
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [i#22, s#23]{noformat}
>
> >== 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 :
> {code:java}
> == Optimized Logical Plan ==
> Join LeftSemi, (i#22 = i#20)
> :- Filter isnotnull(i#20)
> : +- HiveTableRelation `default`.`tt1`,
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [i#20, s#21]
> +- Project [i#22]
> +- HiveTableRelation `default`.`tt2`,
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [i#22, s#23]
> {code}
>
> 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.
>
>
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