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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-1246) mapjoin followed by another mapjoin should be performed in a single query
Date Tue, 16 Mar 2010 06:38:27 GMT
mapjoin followed by another mapjoin should be performed in a single query
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                 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


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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