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https://issues.apache.org/jira/browse/HIVE-1730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ashutosh Chauhan resolved HIVE-1730.
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    Resolution: Not A Problem

With HIVE-1754 jdbm is removed so this is no longer relevant.
                
> Keep the mapping between jdbm file name with bucket file name during the 
> compile time
> -------------------------------------------------------------------------------------
>
>                 Key: HIVE-1730
>                 URL: https://issues.apache.org/jira/browse/HIVE-1730
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Query Processor
>    Affects Versions: 0.7.0
>            Reporter: Liyin Tang
>            Assignee: Liyin Tang
>
> Right now, the new map join operator will figure out the jdbm file name 
> during the run time based some string function.
> But we need to keep this mapping during the compile time, so the explain task 
> can understand which jdbm file the mapred task will need.

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