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