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https://issues.apache.org/jira/browse/HIVE-15996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16036177#comment-16036177
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Lefty Leverenz commented on HIVE-15996:
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This needs to be documented in the wiki, with version information.
* [Enhanced Aggregation, Cube, Grouping and Rollup |
https://cwiki.apache.org/confluence/display/Hive/Enhanced+Aggregation%2C+Cube%2C+Grouping+and+Rollup]
The whole doc probably needs to be reviewed and updated.
> Implement multiargument GROUPING function
> -----------------------------------------
>
> Key: HIVE-15996
> URL: https://issues.apache.org/jira/browse/HIVE-15996
> Project: Hive
> Issue Type: New Feature
> Affects Versions: 2.2.0
> Reporter: Carter Shanklin
> Assignee: Jesus Camacho Rodriguez
> Labels: TODOC3.0
> Fix For: 3.0.0
>
> Attachments: HIVE-15996.01.patch, HIVE-15996.02.patch,
> HIVE-15996.03.patch, HIVE-15996.04.patch
>
>
> Per the SQL standard section 6.9:
> GROUPING ( CR1, ..., CRN-1, CRN )
> is equivalent to:
> CAST ( ( 2 * GROUPING ( CR1, ..., CRN-1 ) + GROUPING ( CRN ) ) AS IDT )
> So for example:
> select c1, c2, c3, grouping(c1, c2, c3) from e011_02 group by rollup(c1, c2,
> c3);
> Should be allowed and equivalent to:
> select c1, c2, c3, 4*grouping(c1) + 2*grouping(c2) + grouping(c3) from
> e011_02 group by rollup(c1, c2, c3);
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