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https://issues.apache.org/jira/browse/HIVE-9039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14312940#comment-14312940
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Lefty Leverenz commented on HIVE-9039:
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Doc note: This should be documented in the UNION doc, with version information.
The SELECT doc needs to be updated, because currently its link to the UNION doc
says UNION ALL. Also, the section "ALL and DISTINCT Clauses" should link to
the UNION doc (and "0.15" should be updated to "1.1.0".)
* [LanguageManual -- Union |
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Union]
* [LanguageManual -- Select |
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Select]
** [Select -- ALL and DISTINCT Clauses |
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Select#LanguageManualSelect-ALLandDISTINCTClauses]
** [Select -- More Select Syntax -- UNION ALL |
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Select#LanguageManualSelect-UNIONALL]
And how about a release note?
> Support Union Distinct
> ----------------------
>
> Key: HIVE-9039
> URL: https://issues.apache.org/jira/browse/HIVE-9039
> Project: Hive
> Issue Type: New Feature
> Components: Query Planning
> Reporter: Pengcheng Xiong
> Assignee: Pengcheng Xiong
> Labels: TODOC1.2
> Fix For: 1.2.0
>
> 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,
> HIVE-9039.21.patch, HIVE-9039.22.patch, HIVE-9039.23.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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