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https://issues.apache.org/jira/browse/HIVE-2397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13098523#comment-13098523
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Kevin Wilfong commented on HIVE-2397:
-------------------------------------
I create a Design Doc in the Hive Wiki describing the changes to the query plan
produced by this change.
https://cwiki.apache.org/confluence/display/Hive/GroupByWithRollup
> Support with rollup option for group by
> ---------------------------------------
>
> Key: HIVE-2397
> URL: https://issues.apache.org/jira/browse/HIVE-2397
> Project: Hive
> Issue Type: New Feature
> Reporter: Kevin Wilfong
> Assignee: Kevin Wilfong
> Attachments: HIVE-2397.2.patch.txt, HIVE-2397.3.patch.txt
>
>
> We should support the ROLLUP operator similar to the way MySQL is
> implemented.
> Exerted from MySQL documents:
> mysql> SELECT year, country, product, SUM(profit)
> -> FROM sales
> -> GROUP BY year, country, product WITH ROLLUP;
> +------+---------+------------+-------------+
> | year | country | product | SUM(profit) |
> +------+---------+------------+-------------+
> | 2000 | Finland | Computer | 1500 |
> | 2000 | Finland | Phone | 100 |
> | 2000 | Finland | NULL | 1600 |
> | 2000 | India | Calculator | 150 |
> | 2000 | India | Computer | 1200 |
> | 2000 | India | NULL | 1350 |
> | 2000 | USA | Calculator | 75 |
> | 2000 | USA | Computer | 1500 |
> | 2000 | USA | NULL | 1575 |
> | 2000 | NULL | NULL | 4525 |
> | 2001 | Finland | Phone | 10 |
> | 2001 | Finland | NULL | 10 |
> | 2001 | USA | Calculator | 50 |
> | 2001 | USA | Computer | 2700 |
> | 2001 | USA | TV | 250 |
> | 2001 | USA | NULL | 3000 |
> | 2001 | NULL | NULL | 3010 |
> | NULL | NULL | NULL | 7535 |
> +------+---------+------------+-------------+
> http://dev.mysql.com/doc/refman/5.0/en/group-by-modifiers.html
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