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https://issues.apache.org/jira/browse/HIVE-12272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14977616#comment-14977616
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Pengcheng Xiong commented on HIVE-12272:
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[~ashutoshc], in the old return path, there is always a SEL after union. :)
> CBO: Calcite Operator To Hive Operator (Calcite Return Path) : columnPruner
> prunes everything when union is the last operator before FS
> ---------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-12272
> URL: https://issues.apache.org/jira/browse/HIVE-12272
> Project: Hive
> Issue Type: Sub-task
> Components: CBO
> Reporter: Pengcheng Xiong
> Assignee: Pengcheng Xiong
> Attachments: HIVE-12272.01.patch
>
>
> To repo, run testCliDriver_unionDistinct_2 with return path on.
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