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https://issues.apache.org/jira/browse/SPARK-13354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15149923#comment-15149923
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Apache Spark commented on SPARK-13354:
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User 'davies' has created a pull request for this issue:
https://github.com/apache/spark/pull/11234
> Push filter throughout outer join when the condition can filter out empty row
> ------------------------------------------------------------------------------
>
> Key: SPARK-13354
> URL: https://issues.apache.org/jira/browse/SPARK-13354
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Davies Liu
> Assignee: Davies Liu
>
> For a query
> {code}
> select * from a left outer join b on a.a = b.a where b.b > 10
> {code}
> The condition `b.b > 10` will filter out all the row that the b part of it is
> empty.
> In this case, we should use Inner join, and push down the filter into b.
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