John Sherman created HIVE-26938:
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Summary: Investigate SMB Map Join for FULL OUTER
Key: HIVE-26938
URL: https://issues.apache.org/jira/browse/HIVE-26938
Project: Hive
Issue Type: Improvement
Components: HiveServer2
Reporter: John Sherman
Assignee: John Sherman
HIVE-18908 added FULL OUTER Map Join support but this work did not add support
for SMB Map Joins for FULL OUTER.
We should investigate if we can safely support SMB Map Join for this scenario
and implement it if so.
This is the area in which it gives up conversion, if we modify this line to
pass a 2nd argument of true to getBigTableCandidates to enable
isFullOuterJoinSupported - it does successfully convert (but we need to verify
that execution does the correct thing).
[https://github.com/apache/hive/blob/03ad025ada776c0d359124c6342615f1983c1a94/ql/src/java/org/apache/hadoop/hive/ql/optimizer/ConvertJoinMapJoin.java#L482]
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