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https://issues.apache.org/jira/browse/HIVE-28532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17884036#comment-17884036
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Ramesh Kumar Thangarajan commented on HIVE-28532:
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Yes, thank you [~dkuzmenko] . I will update the Jira description accordingly.
> 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)
> Components: Logical Optimizer
> Affects Versions: 4.0.0
> 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.
> {code}
> Caused by: java.lang.ClassCastException: class
> org.apache.hadoop.hive.ql.exec.vector.mapjoin.fast.VectorMapJoinFastStringHashMultiSetContainer
> cannot be cast to class
> org.apache.hadoop.hive.ql.exec.vector.mapjoin.hashtable.VectorMapJoinHashMap
> {code}
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