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https://issues.apache.org/jira/browse/DRILL-4927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15545005#comment-15545005
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Khurram Faraaz commented on DRILL-4927:
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Same as DRILL-4539
> 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
>
> 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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