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https://issues.apache.org/jira/browse/HIVE-18908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16391692#comment-16391692
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Matt McCline commented on HIVE-18908:
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Patch #1 is a Work-In-Progress. FULL OUTER MapJoin for Optimized hash tables
is broken and checks are missing to not use it for MR, etc.
> Add support for FULL OUTER JOIN to MapJoin
> ------------------------------------------
>
> Key: HIVE-18908
> URL: https://issues.apache.org/jira/browse/HIVE-18908
> Project: Hive
> Issue Type: Improvement
> Components: Hive
> Reporter: Matt McCline
> Assignee: Matt McCline
> Priority: Critical
> Attachments: HIVE-18908.01.patch
>
>
> Currently, we do not support FULL OUTER JOIN in MapJoin.
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