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https://issues.apache.org/jira/browse/HIVE-12325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14993889#comment-14993889
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Ashutosh Chauhan commented on HIVE-12325:
-----------------------------------------
+1
> Turn hive.map.groupby.sorted on by default
> ------------------------------------------
>
> Key: HIVE-12325
> URL: https://issues.apache.org/jira/browse/HIVE-12325
> Project: Hive
> Issue Type: Improvement
> Components: Logical Optimizer
> Reporter: Ashutosh Chauhan
> Assignee: Chetna Chaudhari
> Attachments: HIVE-12325.1.patch
>
>
> When applicable it can avoid shuffle phase altogether for group by, which
> will be a performance win.
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