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https://issues.apache.org/jira/browse/SPARK-16804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15400068#comment-15400068
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Apache Spark commented on SPARK-16804:
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User 'nsyca' has created a pull request for this issue:
https://github.com/apache/spark/pull/14411
> Correlated subqueries containing LIMIT 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
> 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:
> 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|
> +---+
> The correct result contains both rows from T1.
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