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https://issues.apache.org/jira/browse/SPARK-12605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15076595#comment-15076595
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Apache Spark commented on SPARK-12605:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/10556
> Pushing Join Predicates Through Union All
> -----------------------------------------
>
> Key: SPARK-12605
> URL: https://issues.apache.org/jira/browse/SPARK-12605
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.6.0
> Reporter: Xiao Li
>
> When selectivity of Join predicates is high, we can push join through union
> all.
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