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  1. Hive
  2. HIVE-3673

Sort merge join not used when join columns have different names

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Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 0.10.0
    • 0.10.0
    • Query Processor
    • None
    • Reviewed

    Description

      If two tables are joined on columns with different names, the sort merge join optimization is not applied. E.g.

      SELECT /*+ MAPJOIN(b) */ * FROM t1 a JOIN t2 b ON a.key = b.value;

      This will not use sort merge join even if t1 and t2 are bucketed and sorted by key, value respectively.

      Attachments

        1. HIVE-3673.1.patch.txt
          11 kB
          Kevin Wilfong
        2. HIVE-3673.2.patch.txt
          23 kB
          Kevin Wilfong

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            kevinwilfong Kevin Wilfong Assign to me
            kevinwilfong Kevin Wilfong
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              Updated:
              Resolved:

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