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https://issues.apache.org/jira/browse/HIVE-1246?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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He Yongqiang updated HIVE-1246:
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Attachment: hive-1246.1.patch
hive-1246.1.patch passed all tests in my local test.
> 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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