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  1. Hive
  2. HIVE-11262

Skip MapJoin processing if the join hash table is empty

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Details

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 1.3.0, 2.0.0
    • Query Processor
    • None

    Description

      Currently the map join processor processes all rows of the big table, even when the hash table is empty. If it is an inner join, we should be able to skip the join processing, since the result should be empty.

      Attachments

        1. HIVE-11262.2.patch
          11 kB
          Jason Dere
        2. HIVE-11262.1.patch
          8 kB
          Jason Dere

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. HIVE-12905 Issue with mapjoin in tez under certain conditions

          • Blocker - Blocks development and/or testing work, production could not run
          • Closed

          Activity

            People

              jdere Jason Dere
              jdere Jason Dere
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              Dates

                Created:
                Updated:
                Resolved: