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https://issues.apache.org/jira/browse/SPARK-12602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15076435#comment-15076435
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Apache Spark commented on SPARK-12602:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/10551
> Join Reordering: Pushing Inner Join Through Outer Join
> ------------------------------------------------------
>
> Key: SPARK-12602
> URL: https://issues.apache.org/jira/browse/SPARK-12602
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.6.0
> Reporter: Xiao Li
> Priority: Critical
>
> If applicable, we can push Inner Join through Outer Join. This can reduce the
> number of rows since the Inner Join always can generate less rows than Outer
> Join.
> This can improve the performance.
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