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https://issues.apache.org/jira/browse/HIVE-10901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15669316#comment-15669316
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Pengcheng Xiong commented on HIVE-10901:
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[~gopalv], I am not sure how many reducers were used in jenkins, but it may be
related to what you described last time.
> Optimize mutli column distinct queries
> ----------------------------------------
>
> Key: HIVE-10901
> URL: https://issues.apache.org/jira/browse/HIVE-10901
> Project: Hive
> Issue Type: New Feature
> Components: CBO, Logical Optimizer
> Affects Versions: 1.2.0
> Reporter: Mostafa Mokhtar
> Assignee: Pengcheng Xiong
> Attachments: HIVE-10901.02.patch, HIVE-10901.03.patch,
> HIVE-10901.patch
>
>
> HIVE-10568 is useful only when there is a distinct on one column. It can be
> expanded for multiple column cases too.
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