[jira] [Created] (SPARK-19712) EXISTS and Left Semi join do not produce the same plan

["Nattavut Sutyanyong (JIRA)" <ji...@apache.org>]

Nattavut Sutyanyong created SPARK-19712:
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             Summary: EXISTS and Left Semi join do not produce the same plan
                 Key: SPARK-19712
                 URL: https://issues.apache.org/jira/browse/SPARK-19712
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
    Affects Versions: 2.1.0
            Reporter: Nattavut Sutyanyong


This problem is found during the development of SPARK-18874.

The EXISTS form in the following query:

{{sql("select * from t1 inner join t2 on t1.t1a=t2.t2a where exists (select 1 from t3 where t1.t1b=t3.t3b)")}}

gives the optimized plan below:

{code}
== Optimized Logical Plan ==
Join Inner, (t1a#7 = t2a#25)
:- Join LeftSemi, (t1b#8 = t3b#58)
:  :- Filter isnotnull(t1a#7)
:  :  +- Relation[t1a#7,t1b#8,t1c#9] parquet
:  +- Project [1 AS 1#271, t3b#58]
:     +- Relation[t3a#57,t3b#58,t3c#59] parquet
+- Filter isnotnull(t2a#25)
   +- Relation[t2a#25,t2b#26,t2c#27] parquet
{code}

whereas a semantically equivalent Left Semi join query below:

{{sql("select * from t1 inner join t2 on t1.t1a=t2.t2a left semi join t3 on t1.t1b=t3.t3b")}}

gives the following optimized plan:

{code}
== Optimized Logical Plan ==
Join LeftSemi, (t1b#8 = t3b#58)
:- Join Inner, (t1a#7 = t2a#25)
:  :- Filter (isnotnull(t1b#8) && isnotnull(t1a#7))
:  :  +- Relation[t1a#7,t1b#8,t1c#9] parquet
:  +- Filter isnotnull(t2a#25)
:     +- Relation[t2a#25,t2b#26,t2c#27] parquet
+- Project [t3b#58]
   +- Relation[t3a#57,t3b#58,t3c#59] parquet
{code}





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