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From "Chaoyu Tang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12566) Incorrect result returns when using COALESCE in WHERE condition with LEFT JOIN
Date Sat, 05 Dec 2015 16:07:11 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15043365#comment-15043365
] 

Chaoyu Tang commented on HIVE-12566:
------------------------------------

None of 8 failed tests is related to this patch.

> Incorrect result returns when using COALESCE in WHERE condition with LEFT JOIN
> ------------------------------------------------------------------------------
>
>                 Key: HIVE-12566
>                 URL: https://issues.apache.org/jira/browse/HIVE-12566
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Planning
>    Affects Versions: 0.13.0
>            Reporter: Chaoyu Tang
>            Assignee: Chaoyu Tang
>            Priority: Critical
>         Attachments: HIVE-12566.1.patch, HIVE-12566.patch
>
>
> The left join query with on/where clause returns incorrect result (more rows are returned).
See the reproducible sample below.
> Left table with data:
> {code}
> CREATE TABLE ltable (i int, la int, lk1 string, lk2 string) ROW FORMAT DELIMITED FIELDS
TERMINATED BY ',';
> ---
> 1,\N,CD5415192314304,00071
> 2,\N,CD5415192225530,00071
> {code}
> Right  table with data:
> {code}
> CREATE TABLE rtable (ra int, rk1 string, rk2 string) ROW FORMAT DELIMITED FIELDS TERMINATED
BY ',';
> ---
> 1,CD5415192314304,00071
> 45,CD5415192314304,00072
> {code}
> Query:
> {code}
> SELECT * FROM ltable l LEFT OUTER JOIN rtable r on (l.lk1 = r.rk1 AND l.lk2 = r.rk2)
WHERE COALESCE(l.la,'EMPTY')=COALESCE(r.ra,'EMPTY');
> {code}
> Result returns:
> {code}
> 1	NULL	CD5415192314304	00071	NULL	NULL	NULL
> 2	NULL	CD5415192225530	00071	NULL	NULL	NULL
> {code}
> The correct result should be
> {code}
> 2	NULL	CD5415192225530	00071	NULL	NULL	NULL
> {code}



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