[DRILL-4926] Add support for Null Equality Joins

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 1.8.0
• Component/s: Query Planning & Optimization
• Assignee: Roman Kulyk
• Reporter: Roman Kulyk
• Created: 04/Oct/16 10:21
• Updated: 04/Oct/16 10:27
• Resolved: 04/Oct/16 10:27

Description

Join with an equality condition which allows null=null fails. For example, if we use some of this queries:

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);

we got "UNSUPPORTED_OPERATION ERROR". We should add support of this option.

Issue Links

• relates to: DRILL-4927 Add support for Null Equality Joins