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https://issues.apache.org/jira/browse/HIVE-23609?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gopal Vijayaraghavan updated HIVE-23609:
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Attachment: HIVE-23609.WIP.patch
> SemiJoin: Relax big table size check for self-joins
> ---------------------------------------------------
>
> Key: HIVE-23609
> URL: https://issues.apache.org/jira/browse/HIVE-23609
> Project: Hive
> Issue Type: Improvement
> Reporter: Gopal Vijayaraghavan
> Assignee: Gopal Vijayaraghavan
> Priority: Major
> Attachments: HIVE-23609.WIP.patch
>
>
> For self-joins, several other heuristics applied to Semijoins don't apply as
> the difference between rows on either side is likely to result in an exact
> reduction of rows scanned.
> This change results in slightly different Tez priorities for self-joins which
> are heavily filtered on one side over the other, which helps ensure the
> smaller table is completed before the bigger table consumes resources.
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