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From "Namit Jain (JIRA)" <>
Subject [jira] Created: (HIVE-1194) sorted merge join
Date Wed, 24 Feb 2010 18:45:30 GMT
sorted merge join

                 Key: HIVE-1194
             Project: Hadoop Hive
          Issue Type: New Feature
          Components: Query Processor
            Reporter: Namit Jain
            Assignee: He Yongqiang
             Fix For: 0.6.0

If the input tables are sorted on the join key, and a mapjoin is being performed, it is useful
to exploit the sorted properties of the table.
This can lead to substantial cpu savings - this needs to work across bucketed map joins also.

Since, sorted properties of a table are not enforced currently, a new parameter can be added
to specify to use the sort-merge join.

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