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https://issues.apache.org/jira/browse/DRILL-6755?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Hou closed DRILL-6755.
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> HashJoin should not build hash tables when probe side is empty.
> ---------------------------------------------------------------
>
>                 Key: DRILL-6755
>                 URL: https://issues.apache.org/jira/browse/DRILL-6755
>             Project: Apache Drill
>          Issue Type: Improvement
>            Reporter: Timothy Farkas
>            Assignee: Boaz Ben-Zvi
>            Priority: Major
>              Labels: ready-to-commit
>             Fix For: 1.15.0
>
>
> Currently when doing an Inner or a Right join we still build hashtables when 
> the probe side is empty. A performance optimization would be to not build 
> them.



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