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https://issues.apache.org/jira/browse/SPARK-16804?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated SPARK-16804:
------------------------------
Assignee: Nattavut Sutyanyong
> Correlated subqueries containing non-deterministic operators return incorrect
> results
> -------------------------------------------------------------------------------------
>
> Key: SPARK-16804
> URL: https://issues.apache.org/jira/browse/SPARK-16804
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Nattavut Sutyanyong
> Assignee: Nattavut Sutyanyong
> Fix For: 2.1.0
>
> Original Estimate: 72h
> Remaining Estimate: 72h
>
> Correlated subqueries with LIMIT could return incorrect results. The rule
> ResolveSubquery in the Analysis phase moves correlated predicates to a join
> predicates and neglect the semantic of the LIMIT.
> Example:
> {noformat}
> Seq(1, 2).toDF("c1").createOrReplaceTempView("t1")
> Seq(1, 2).toDF("c2").createOrReplaceTempView("t2")
> sql("select c1 from t1 where exists (select 1 from t2 where t1.c1=t2.c2 LIMIT
> 1)").show
> +---+
>
> | c1|
> +---+
> | 1|
> +---+
> {noformat}
> The correct result contains both rows from T1.
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