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From "sanjiv singh (JIRA)" <>
Subject [jira] [Created] (HIVE-10310) Support GROUPING() in HIVE
Date Sun, 12 Apr 2015 06:19:12 GMT
sanjiv singh created HIVE-10310:

             Summary: Support GROUPING() in HIVE
                 Key: HIVE-10310
             Project: Hive
          Issue Type: Wish
          Components: Parser, SQL
            Reporter: sanjiv singh
            Priority: Minor

I have lots of queries using GROUPING() function. failing on hive , just because GROUPING()
not supported in hive. See the Query below;  

SELECT fact_1_id,
       GROUPING(fact_1_id) AS f1g, 
       GROUPING(fact_2_id) AS f2g
FROM   dimension_tab
GROUP BY CUBE (fact_1_id, fact_2_id)
ORDER BY fact_1_id, fact_2_id;

In order to run in HIVE all such queries, It  need to be transformed to HIVE syntax. See below
transformed query, compatible to hive. Equivalent have been verived using Case statement .

SELECT fact_1_id,
       (case when (GROUPING__ID & 1) = 0 then 1 else 0 end) as f1g,
       (case when (GROUPING__ID & 2) = 0 then 1 else 0 end) as f2g
FROM   dimension_tab
GROUP BY fact_1_id, fact_2_id WITH CUBE
ORDER BY fact_1_id, fact_2_id;

It would be great if GROUPING() implemented in hive. I see two ways to do it
1) Handle it parser level.
2) GROUPING() aggregate function to hive(recommended)

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