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  1. Spark
  2. SPARK-2042

Take triggers unneeded shuffle.

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Details

    • Improvement
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • 1.0.0
    • 1.0.1, 1.1.0
    • SQL
    • None

    Description

      This query really shouldn't trigger a shuffle:

      sql("SELECT * FROM src LIMIT 10").take(5)

      One fix would be to make the following changes:

      • Fix take to insert a logical limit and then collect()
      • Add a rule for collapsing adjacent limits

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            sameerag Sameer Agarwal
            marmbrus Michael Armbrust
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              Created:
              Updated:
              Resolved: