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https://issues.apache.org/jira/browse/HIVE-9039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14256158#comment-14256158
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Laljo John Pullokkaran commented on HIVE-9039:
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Could you change parser to support Union key word; i.e union -> union Distinct
> Support Union Distinct
> ----------------------
>
> Key: HIVE-9039
> URL: https://issues.apache.org/jira/browse/HIVE-9039
> Project: Hive
> Issue Type: New Feature
> Reporter: Pengcheng Xiong
> Assignee: Pengcheng Xiong
> Attachments: HIVE-9039.01.patch, HIVE-9039.02.patch,
> HIVE-9039.03.patch, HIVE-9039.04.patch, HIVE-9039.05.patch
>
>
> Current version (Hive 0.14) does not support union (or union distinct). It
> only supports union all. In this patch, we try to add this new feature by
> rewriting union distinct to union all followed by group by.
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