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https://issues.apache.org/jira/browse/HIVE-4105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13632012#comment-13632012
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Ashutosh Chauhan commented on HIVE-4105:
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+1 will commit if tests pass.
> Hive MapJoinOperator unnecessarily deserializes values for all join-keys
> ------------------------------------------------------------------------
>
> Key: HIVE-4105
> URL: https://issues.apache.org/jira/browse/HIVE-4105
> Project: Hive
> Issue Type: Bug
> Reporter: Vinod Kumar Vavilapalli
> Assignee: Vinod Kumar Vavilapalli
> Attachments: HIVE-4105-20130301.1.txt, HIVE-4105-20130301.txt,
> HIVE-4105-20130415.txt, HIVE-4105.patch
>
>
> We can avoid this for inner-joins. Hive does an explicit value
> de-serialization up front so even for those rows which won't emit output. In
> these cases, we can do just with key de-serialization.
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