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  1. Spark
  2. SPARK-32291

COALESCE should not reduce the child parallelism if it is Join

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Details

    • Improvement
    • Status: In Progress
    • Major
    • Resolution: Unresolved
    • 3.1.0
    • None
    • SQL
    • None

    Description

      How to reproduce this issue:

      spark.range(100).createTempView("t1")
spark.range(200).createTempView("t2")
spark.sql("set spark.sql.autoBroadcastJoinThreshold=0")
spark.sql("select /*+ COALESCE(1) */ t1.* from t1 join t2 on (t1.id = t2.id)").show

      The dag is:

      A real case:

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        1. coalesce.png
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          Yuming Wang
        2. COALESCE.png
          287 kB
          Yuming Wang
        3. repartition.png
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          Yuming Wang

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            Unassigned Unassigned
            yumwang Yuming Wang
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            Dates

              Created:
              Updated:

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