[jira] [Updated] (HIVE-17617) Rollup of an empty resultset should contain the grouping of the empty grouping set

["Zoltan Haindrich (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-17617?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zoltan Haindrich updated HIVE-17617:
------------------------------------
    Attachment: HIVE-17617.01.patch

#1) possibly works patch :)

> Rollup of an empty resultset should contain the grouping of the empty grouping set
> ----------------------------------------------------------------------------------
>
>                 Key: HIVE-17617
>                 URL: https://issues.apache.org/jira/browse/HIVE-17617
>             Project: Hive
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Zoltan Haindrich
>         Attachments: HIVE-17617.01.patch
>
>
> running
> {code}
> drop table if exists tx1;
> create table tx1 (a integer,b integer,c integer);
> select  sum(c),
>         grouping(b)
> from    tx1
> group by rollup (b);
> {code}
> returns 0 rows; however 
> according to the standard:
> The <empty grouping set> is regarded as the shortest such initial sublist. For example, “ROLLUP ( (A, B), (C, D) )”
> is equivalent to “GROUPING SETS ( (A, B, C, D), (A, B), () )”.
> so I think the totals row (the grouping for {{()}} should be present)  - psql returns it.



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