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https://issues.apache.org/jira/browse/HIVE-28532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17883754#comment-17883754
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Denys Kuzmenko commented on HIVE-28532:
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it's not limited to Outer joins only, there are multiple other combinations
like ANTI_JOIN/LEFT_SEMI_JOIN(HASHSET) + INNER_JOIN (HASH_MULTISET)
> Map Join Reuse cache allows to share hashtables for Outer join and Inner join
> -----------------------------------------------------------------------------
>
> Key: HIVE-28532
> URL: https://issues.apache.org/jira/browse/HIVE-28532
> Project: Hive
> Issue Type: Bug
> Security Level: Public(Viewable by anyone)
> Reporter: Ramesh Kumar Thangarajan
> Assignee: Ramesh Kumar Thangarajan
> Priority: Major
>
> Map Join Reuse cache allows to share hashtables for Outer join and Inner
> join. But we cannot reuse a hash table for a non-outer join vs outer join.
> Because outer join cannot accept the hash table kind other than HASHMAP,
> whereas there are other types like HASHSET and HASH_MULTISET.
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