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From "Jesus Camacho Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-15996) Implement multiargument GROUPING function
Date Tue, 21 Feb 2017 15:11:44 GMT
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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