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https://issues.apache.org/jira/browse/HIVE-15981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15905692#comment-15905692
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Ashutosh Chauhan commented on HIVE-15981:
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+1 pending tests
> Allow empty grouping sets
> -------------------------
>
> Key: HIVE-15981
> URL: https://issues.apache.org/jira/browse/HIVE-15981
> Project: Hive
> Issue Type: Sub-task
> Components: SQL
> Reporter: Carter Shanklin
> Assignee: Zoltan Haindrich
> Attachments: HIVE-15981.1.patch, HIVE-15981.2.patch
>
>
> group by () should be treated as equivalent to no group by clause. Currently
> it throws a parse error
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