You are viewing a plain text version of this content. The canonical link for it is here.

Posted to dev@hive.apache.org by "Ashutosh Chauhan (JIRA)" <ji...@apache.org> on 2013/01/14 23:46:13 UTC

[jira] [Commented] (HIVE-1283) map join does not stream the big tables

    [ https://issues.apache.org/jira/browse/HIVE-1283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13553219#comment-13553219 ] 

Ashutosh Chauhan commented on HIVE-1283:
----------------------------------------

I didn't look at the code, but is this still true on trunk? If so, implementing this will help a lot in lowering memory footprint for map-joins.
                
> map join does not stream the big tables
> ---------------------------------------
>
>                 Key: HIVE-1283
>                 URL: https://issues.apache.org/jira/browse/HIVE-1283
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Namit Jain
>
> Currently, all the keys from the big table are read before the join is performed.
> It might be very slow if there is a hue skew, it might be a good optimization to stream the larger table

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira