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https://issues.apache.org/jira/browse/SPARK-21835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16143321#comment-16143321
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Apache Spark commented on SPARK-21835:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/19050
> RewritePredicateSubquery should not produce unresolved query plans
> ------------------------------------------------------------------
>
> Key: SPARK-21835
> URL: https://issues.apache.org/jira/browse/SPARK-21835
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Liang-Chi Hsieh
>
> {{RewritePredicateSubquery}} rewrites correlated subquery to join operations.
> During the structural integrity, I found {[RewritePredicateSubquery}} can
> produce unresolved query plans due to conflicting attributes. We should not
> let {{RewritePredicateSubquery}} produce unresolved plans.
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