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https://issues.apache.org/jira/browse/HIVE-15981?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltan Haindrich updated HIVE-15981:
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Attachment: HIVE-15981.1.patch
#1) add parser rule to accept empty groupby; the whole group by clause is
dropped in this case
> 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
>
>
> group by () should be treated as equivalent to no group by clause. Currently
> it throws a parse error
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