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https://issues.apache.org/jira/browse/SPARK-17107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16149322#comment-16149322
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Apache Spark commented on SPARK-17107:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/19097
> Remove redundant pushdown rule for Union
> ----------------------------------------
>
> Key: SPARK-17107
> URL: https://issues.apache.org/jira/browse/SPARK-17107
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Liang-Chi Hsieh
> Assignee: Liang-Chi Hsieh
> Priority: Minor
> Fix For: 2.1.0
>
>
> The Optimizer rules PushThroughSetOperations and PushDownPredicate have a
> redundant rule to push down Filter through Union. We should remove it.
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