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https://issues.apache.org/jira/browse/HIVE-15938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15870798#comment-15870798
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Sergey Shelukhin commented on HIVE-15938:
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Woops, actually the replacement code is completely screwed, creating ambiguous
nodes.
> position alias in order by fails for union queries
> --------------------------------------------------
>
> Key: HIVE-15938
> URL: https://issues.apache.org/jira/browse/HIVE-15938
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-15938.patch
>
>
> The problem is that the query introduces a spurious ALLCOLREF
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