[jira] [Created] (DRILL-4927) Add support for Null Equality Joins

[Roman (JIRA)]

Roman created DRILL-4927:
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             Summary: 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 of this option.



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