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https://issues.apache.org/jira/browse/HIVE-15938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15870724#comment-15870724
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Sergey Shelukhin commented on HIVE-15938:
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Yeah, there's some weird issue with subqueries with union... the SA thinks
newly added column names are ambiguous with something even though there's only
one level and there was no ambiguity before. Looking.
> 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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