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  1. Hive
  2. HIVE-1194

sorted merge join

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    Details

    • Type: New Feature
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.6.0
    • Component/s: Query Processor
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      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.

        Attachments

        1. hive-1194-2010-02-28.patch
          84 kB
          He Yongqiang
        2. hive-1194-2010-3-2.2.patch
          304 kB
          He Yongqiang
        3. hive-1194-2010-3-2.patch
          304 kB
          He Yongqiang
        4. hive-1194-2010-3-3.patch
          380 kB
          He Yongqiang
        5. hive-1194-2010-3-3-2.patch
          380 kB
          He Yongqiang
        6. hive-1194-2010-3-4.patch
          396 kB
          He Yongqiang

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              • Assignee:
                he yongqiang He Yongqiang
                Reporter:
                namit Namit Jain
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                Dates

                • Created:
                  Updated:
                  Resolved: