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https://issues.apache.org/jira/browse/HIVE-11262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14629016#comment-14629016
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Wei Zheng commented on HIVE-11262:
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Patch 2 looks good to me.
+1, non-binding
> Skip MapJoin processing if the join hash table is empty
> -------------------------------------------------------
>
> Key: HIVE-11262
> URL: https://issues.apache.org/jira/browse/HIVE-11262
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Jason Dere
> Assignee: Jason Dere
> Attachments: HIVE-11262.1.patch, HIVE-11262.2.patch
>
>
> Currently the map join processor processes all rows of the big table, even
> when the hash table is empty. If it is an inner join, we should be able to
> skip the join processing, since the result should be empty.
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