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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-1283) map join does not stream the big tables
Date Mon, 14 Jan 2013 22:46:13 GMT

    [ 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

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