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From "Yin Huai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5149) ReduceSinkDeDuplication can pick the wrong partitioning columns
Date Thu, 29 Aug 2013 21:25:53 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13754076#comment-13754076
] 

Yin Huai commented on HIVE-5149:
--------------------------------

Right, we should only use key as the partitioning column.

Actually, the example I posted above is from test file "reduce_deduplicate_extended.q". The
plan of "explain from (select key, value from src group by key, value) s select s.key group
by s.key" in hive trunk is wrong. 
                
> ReduceSinkDeDuplication can pick the wrong partitioning columns
> ---------------------------------------------------------------
>
>                 Key: HIVE-5149
>                 URL: https://issues.apache.org/jira/browse/HIVE-5149
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.11.0, 0.12.0
>            Reporter: Yin Huai
>            Assignee: Yin Huai
>         Attachments: HIVE-5149.1.patch, HIVE-5149.2.patch
>
>
> https://mail-archives.apache.org/mod_mbox/hive-user/201308.mbox/%3CCAG6Lhyex5XPwszpihKqkPRpzri2k=m4QGc+cpAR5yVR8SJtM4Q@mail.gmail.com%3E

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