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https://issues.apache.org/jira/browse/HIVE-21542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16849511#comment-16849511
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Zoltan Haindrich commented on HIVE-21542:
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[~isuller] seems like a duplicate of HIVE-21795?
> Group by rollup returns with empty result when the grouped dataset is empty
> ---------------------------------------------------------------------------
>
> Key: HIVE-21542
> URL: https://issues.apache.org/jira/browse/HIVE-21542
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Reporter: Ivan Suller
> Assignee: Ivan Suller
> Priority: Major
> Attachments: groupby_rollup_empty2.q
>
>
> Running the attached q file the result is not what is expected: the rollup
> group by missing the one summary row. The summary row should be there even if
> the source dataset is empty.
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