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https://issues.apache.org/jira/browse/HIVE-12325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14991072#comment-14991072
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Chetna Chaudhari commented on HIVE-12325:
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I think along with this we should turn on {{hive.map.groupby.sorted.testmode}}
as well. [~ashutoshc] any thoughts.
> 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
>
> When applicable it can avoid shuffle phase altogether for group by, which
> will be a performance win.
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