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https://issues.apache.org/jira/browse/SPARK-13544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15171391#comment-15171391
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Apache Spark commented on SPARK-13544:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/11422
> Rewrite/Propagate constraints for Aliases in Aggregate and Windows
> ------------------------------------------------------------------
>
> Key: SPARK-13544
> URL: https://issues.apache.org/jira/browse/SPARK-13544
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Xiao Li
>
> After plan analysis by Analyzer, three operators could have alias. They are
> Project, Aggregate and Window. So far, only Alias defined in Project will
> rewrite and propagate constraints.
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