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https://issues.apache.org/jira/browse/HIVE-18523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16354284#comment-16354284
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Ashutosh Chauhan commented on HIVE-18523:
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+1
> Fix summary row in case there are no inputs
> -------------------------------------------
>
> Key: HIVE-18523
> URL: https://issues.apache.org/jira/browse/HIVE-18523
> Project: Hive
> Issue Type: Bug
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Attachments: HIVE-18523.01.patch, HIVE-18523.03.patch
>
>
> HIVE-17617 added a fix to handle empty groups correctly; however it might be
> possible that the summary row is returned multiple times - in case the
> mappers are "seem" to be optimized away...
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