[jira] [Commented] (HIVE-23101) Fix topnkey_grouping_sets

["Peter Vary (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-23101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17072549#comment-17072549 ] 

Peter Vary commented on HIVE-23101:
-----------------------------------

Pushed the patch 1 to master to unblock PreCommits.


> Fix topnkey_grouping_sets
> -------------------------
>
>                 Key: HIVE-23101
>                 URL: https://issues.apache.org/jira/browse/HIVE-23101
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Krisztian Kasa
>            Assignee: Krisztian Kasa
>            Priority: Major
>             Fix For: 4.0.0
>
>         Attachments: HIVE-23101.1.patch, HIVE-23101.2.patch
>
>
> Example:
> {code}
> Client Execution succeeded but contained differences (error code = 1) after executing topnkey_grouping_sets.q 
> 260c260
> < NULL NULL
> ---
> > NULL 1
> {code}
>  
> Test *topnkey_grouping_sets* fails intermittently.
> Queries which project 2 columns but order by only one of them can have more than one good result set:
> {code:java}
> CREATE TABLE t_test_grouping_sets(
>   a int,
>   b int,
>   c int
> );
> INSERT INTO t_test_grouping_sets VALUES
> (NULL, NULL, NULL),
> (5, 2, 3),
> (10, 11, 12),
> (NULL, NULL, NULL),
> (NULL, NULL, NULL),
> (6, 2, 1),
> (7, 8, 4), (7, 8, 4), (7, 8, 4),
> (5, 1, 2), (5, 1, 2), (5, 1, 2),
> (NULL, NULL, NULL);
> SELECT a, b FROM t_test_grouping_sets GROUP BY GROUPING SETS ((a, b), (a), (b), ()) ORDER BY a LIMIT 10;
> {code}
> {code:java}
> 5	NULL
> 5	2
> 5	1
> 6	2
> 6	NULL
> 7	8
> 7	NULL
> 10	NULL
> 10	11
> NULL	1
> {code}
> {code:java}
> 5	NULL
> 5	2
> 5	1
> 6	2
> 6	NULL
> 7	8
> 7	NULL
> 10	NULL
> 10	11
> NULL	NULL
> {code}
> Since we don't order by *b* both result sets are valid.



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