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https://issues.apache.org/jira/browse/SPARK-22615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16266745#comment-16266745
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Apache Spark commented on SPARK-22615:
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User 'gengliangwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/19825
> Handle more cases in PropagateEmptyRelation
> --------------------------------------------
>
> Key: SPARK-22615
> URL: https://issues.apache.org/jira/browse/SPARK-22615
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Gengliang Wang
>
> Currently, in the optimize rule `PropagateEmptyRelation`, the following cases
> is not handled:
> 1. right child is empty relation in left outer join
> 2. left child in right outer join
> 3. right child is empty relation in left semi join
> 4. right child is empty relation in left anti join
> case #1 and #2 can be treated as cross join and cause exception.
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