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https://issues.apache.org/jira/browse/SPARK-14562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15237528#comment-15237528
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Apache Spark commented on SPARK-14562:
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User 'davies' has created a pull request for this issue:
https://github.com/apache/spark/pull/12328
> Improve constraints propagation in Union
> ----------------------------------------
>
> Key: SPARK-14562
> URL: https://issues.apache.org/jira/browse/SPARK-14562
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Davies Liu
> Assignee: Davies Liu
>
> Currently, Union only takes intersect of the constraints from it's children,
> all others are dropped, we should try to merge them together.
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