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https://issues.apache.org/jira/browse/HIVE-26938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Sherman reassigned HIVE-26938:
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> 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
> Priority: Major
>
> 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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