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From "Jason Dere (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-11262) Skip MapJoin processing if the join hash table is empty
Date Tue, 14 Jul 2015 22:04:05 GMT

     [ https://issues.apache.org/jira/browse/HIVE-11262?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jason Dere updated HIVE-11262:
------------------------------
    Attachment: HIVE-11262.1.patch

> 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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