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https://issues.apache.org/jira/browse/SPARK-12605?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-12605.
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Resolution: Incomplete
> Pushing Join Predicates Through Union All
> -----------------------------------------
>
> Key: SPARK-12605
> URL: https://issues.apache.org/jira/browse/SPARK-12605
> Project: Spark
> Issue Type: Improvement
> Components: Optimizer, SQL
> Affects Versions: 1.6.0
> Reporter: Xiao Li
> Priority: Major
> Labels: bulk-closed
>
> When selectivity of Join predicates is high, we can push join through union
> all.
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