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https://issues.apache.org/jira/browse/HIVE-9039?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pengcheng Xiong updated HIVE-9039:
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Description:
CLEAR LIBRARY CACHE
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.
was: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.
> 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,
> HIVE-9039.06.patch, HIVE-9039.07.patch, HIVE-9039.08.patch,
> HIVE-9039.09.patch, HIVE-9039.10.patch, HIVE-9039.11.patch,
> HIVE-9039.12.patch, HIVE-9039.13.patch, HIVE-9039.14.patch,
> HIVE-9039.15.patch, HIVE-9039.16.patch, HIVE-9039.17.patch,
> HIVE-9039.18.patch, HIVE-9039.19.patch, HIVE-9039.20.patch
>
>
> CLEAR LIBRARY CACHE
> 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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