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Posted to issues@hive.apache.org by "Jason Dere (JIRA)" <ji...@apache.org> on 2015/07/15 00:10:04 UTC

[jira] [Commented] (HIVE-11262) Skip MapJoin processing if the join hash table is empty

    [ https://issues.apache.org/jira/browse/HIVE-11262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14627132#comment-14627132 ] 

Jason Dere commented on HIVE-11262:
-----------------------------------

RB at https://reviews.apache.org/r/36486/

> 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
>
>
> 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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