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https://issues.apache.org/jira/browse/HIVE-21395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16801289#comment-16801289
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Jesus Camacho Rodriguez commented on HIVE-21395:
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+1 (pending tests)
> Refactor HiveSemiJoinRule
> -------------------------
>
> Key: HIVE-21395
> URL: https://issues.apache.org/jira/browse/HIVE-21395
> Project: Hive
> Issue Type: Improvement
> Components: Query Planning
> Affects Versions: 4.0.0
> Reporter: Vineet Garg
> Assignee: Vineet Garg
> Priority: Major
> Attachments: HIVE-21395.1.patch, HIVE-21395.2.patch
>
>
> Following refactoring needs to be done:
> * Update the rule matching pattern to avoid using HepVertex
> * HIVE-21338 adds logic to determine if rel plan will produce at most one
> row. Use this in HiveSemiJoinRule
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