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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-17617) Rollup of an empty resultset should contain the grouping of the empty grouping set
Date Mon, 23 Oct 2017 18:40:00 GMT

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Ashutosh Chauhan commented on HIVE-17617:
-----------------------------------------

*Desc object only suppose to contain configuration for runtime operators not runtime logic,
that is suppose to get into runtime operator. emitSummaryRow() thus belongs in Groupby operator
class. Can you move it there?
rest loos good. +1

> 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
>            Assignee: Zoltan Haindrich
>         Attachments: HIVE-17617.01.patch, HIVE-17617.03.patch, HIVE-17617.04.patch, HIVE-17617.05.patch,
HIVE-17617.06.patch, HIVE-17617.07.patch, HIVE-17617.07.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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