Jesus Camacho Rodriguez created HIVE-15996:
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Summary: 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
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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