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https://issues.apache.org/jira/browse/DRILL-4927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15569769#comment-15569769
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Zelaine Fong commented on DRILL-4927:
-------------------------------------

[~khfaraaz] - yes this fix is in master.  See the last comment indicating that 
the pull request has been closed.

> 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: Aman Sinha
>              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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