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https://issues.apache.org/jira/browse/HIVE-1246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12845988#action_12845988
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Namit Jain commented on HIVE-1246:
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Looks good - let us go over the changes in GenMapRedUtils offline
> mapjoin followed by another mapjoin should be performed in a single query
> -------------------------------------------------------------------------
>
> Key: HIVE-1246
> URL: https://issues.apache.org/jira/browse/HIVE-1246
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: He Yongqiang
> Fix For: 0.6.0
>
> Attachments: hive-1246.1.patch
>
>
> A query like:
> select /*+ MAPJOIN(c) */ ..
> from
> (select /*+ MAPJOIN(b) */ ..
> from a join b on k1) subq1
> join
> c
> on k2
> should be performed in a single map-only job
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