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https://issues.apache.org/jira/browse/SPARK-12503?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Reynold Xin reopened SPARK-12503:
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Assignee: Josh Rosen
> 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: Optimizer, SQL
> Affects Versions: 1.5.0, 1.6.0
> Reporter: Xiao Li
> Assignee: Josh Rosen
> Fix For: 2.0.0
>
>
> "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
> Also, the same topic in Hive: https://issues.apache.org/jira/browse/HIVE-11775
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