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Posted to dev@hive.apache.org by "Xuefu Zhang (JIRA)" <ji...@apache.org> on 2014/12/09 01:12:12 UTC

[jira] [Updated] (HIVE-9045) Choosing right preference between map join and bucket map join [Spark Branch]

     [ https://issues.apache.org/jira/browse/HIVE-9045?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xuefu Zhang updated HIVE-9045:
------------------------------
    Issue Type: Sub-task  (was: Bug)
        Parent: HIVE-7292

> Choosing right preference between map join and bucket map join [Spark Branch]
> -----------------------------------------------------------------------------
>
>                 Key: HIVE-9045
>                 URL: https://issues.apache.org/jira/browse/HIVE-9045
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>            Reporter: Xuefu Zhang
>
> Currently We convert a join to bucket map join only after it's converted to map join. Supposedly, however, bucket map join has a smaller memory print, so a join which doesn't fit to map join might be suitable for a bucket map join. It would be good if we can take this into consideration when applying join optimizations.



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