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https://issues.apache.org/jira/browse/HIVE-5149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13754076#comment-13754076
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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+cpar5yvr8sjt...@mail.gmail.com%3E
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