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https://issues.apache.org/jira/browse/SPARK-12503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15069989#comment-15069989
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Apache Spark commented on SPARK-12503:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/10451
> Pushdown a Limit on top of a Union
> ----------------------------------
>
> Key: SPARK-12503
> URL: https://issues.apache.org/jira/browse/SPARK-12503
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.5.0, 1.6.0
> Reporter: Xiao Li
>
> "Rule that applies to a Limit on top of a Union. The original Limit won't go
> away after applying this rule, but additional Limit nodes will be created on
> top of each child of Union, so that these children produce less rows and
> Limit can be further optimized for children Relations."
> -- from https://issues.apache.org/jira/browse/CALCITE-832
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