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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4927) Add support for Null Equality Joins
Date Wed, 05 Oct 2016 09:59:20 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15548262#comment-15548262
] 

ASF GitHub Bot commented on DRILL-4927:
---------------------------------------

GitHub user KulykRoman opened a pull request:

    https://github.com/apache/drill/pull/603

    DRILL-4927: Add support for Null Equality Joins

    - Added changes to support Null Equality Joins;
    - Created tests for it.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/KulykRoman/drill DRILL-4927

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/drill/pull/603.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #603
    
----
commit b218d64ff0238ec947e6beba9a521d14daee6c42
Author: Roman Kulyk <rom.kulyk@gmail.com>
Date:   2016-10-04T13:58:13Z

    DRILL-4927: Add support for Null Equality Joins
    
    - Added changes to support Null Equality Joins;
    - Created tests for it.

----


> Add support for Null Equality Joins
> -----------------------------------
>
>                 Key: DRILL-4927
>                 URL: https://issues.apache.org/jira/browse/DRILL-4927
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Query Planning & Optimization
>    Affects Versions: 1.8.0
>            Reporter: Roman
>            Assignee: Roman
>              Labels: doc-impacting
>             Fix For: 1.9.0
>
>
> Join with an equality condition which allows null=null fails. For example, if we use
some of this queries:
> {code:sql}
> select ... FROM t1, t2 WHERE t1.c1 = t2.c2 OR (t1.c1 IS NULL AND t2.c2 IS NULL);
> select ... FROM t1 INNER JOIN  t2 ON  t1.c1 = t2.c2 OR (t1.c1 IS NULL AND t2.c2 IS NULL);
> {code}
> we got "UNSUPPORTED_OPERATION ERROR". We should add support for this option.



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