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https://issues.apache.org/jira/browse/HIVE-10310?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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sanjiv singh updated HIVE-10310:
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Summary: Support GROUPING() and GROUP_ID() in HIVE (was: Support
GROUPING() in HIVE)
> Support GROUPING() and GROUP_ID() in HIVE
> -----------------------------------------
>
> Key: HIVE-10310
> URL: https://issues.apache.org/jira/browse/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,
> fact_2_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
> derived using Case statement .
> SELECT fact_1_id,
> fact_2_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 at parser level.
> 2) GROUPING() aggregate function to hive(recommended)
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