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  1. Hive
  2. HIVE-7292 Hive on Spark
  3. HIVE-8638

Implement bucket map join optimization [Spark Branch]

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    Details

    • Type: Sub-task
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 1.1.0
    • Component/s: Spark
    • Labels:
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      Description

      In the hive-on-mr implementation, bucket map join optimization has to depend on the map join hint. While in the hive-on-tez implementation, a join can be automatically converted to bucket map join if certain conditions are met such as:
      1. the optimization flag hive.convert.join.bucket.mapjoin.tez is ON
      2. all join tables are buckets and each small table's bucket number can be divided by big table's bucket number
      3. bucket columns == join columns

      In the hive-on-spark implementation, it is ideal to have the bucket map join auto-convertion support. when all the required criteria are met, a join can be automatically converted to a bucket map join.

        Attachments

        1. HIVE-8638.4-spark.patch
          262 kB
          Jimmy Xiang
        2. HIVE-8638.5-spark.patch
          267 kB
          Jimmy Xiang

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              • Assignee:
                jxiang Jimmy Xiang
                Reporter:
                nyang Na Yang
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                • Created:
                  Updated:
                  Resolved: