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From "Navis (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-3133) Implement non-equi mapjoin
Date Mon, 16 Jul 2012 05:58:34 GMT

     [ https://issues.apache.org/jira/browse/HIVE-3133?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Navis updated HIVE-3133:
------------------------

    Status: Patch Available  (was: Open)

https://reviews.facebook.net/D4137

It's not completed yet, but I expect feedback what missed.
                
> Implement non-equi mapjoin
> --------------------------
>
>                 Key: HIVE-3133
>                 URL: https://issues.apache.org/jira/browse/HIVE-3133
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor, SQL
>    Affects Versions: 0.10.0
>            Reporter: Navis
>            Assignee: Navis
>            Priority: Minor
>
> Currently, hive supports only equi-join which means all joining columns should be related
only with equal operator(= or <=>). 
> It seemed to be not easy to provide non-equi join in general manner but if one of table
is small enough to be fit in memory, it might be possible to be implemented rather easily
by exploiting current implementation of MapJoin.

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