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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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