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Posted to issues@spark.apache.org by "Dongjoon Hyun (JIRA)" <ji...@apache.org> on 2016/06/19 01:04:05 UTC

[jira] [Created] (SPARK-16052) Add CollapseRepartitionBy optimizer

Dongjoon Hyun created SPARK-16052:
-------------------------------------

             Summary: Add CollapseRepartitionBy optimizer
                 Key: SPARK-16052
                 URL: https://issues.apache.org/jira/browse/SPARK-16052
             Project: Spark
          Issue Type: Improvement
          Components: Optimizer
            Reporter: Dongjoon Hyun


This issue adds a new optimizer, `CollapseRepartitionBy`.

**Before**
{code}
scala> spark.range(10).repartition(1, $"id").repartition(1, $"id").explain
== Physical Plan ==
Exchange hashpartitioning(id#0L, 1)
+- Exchange hashpartitioning(id#0L, 1)
   +- *Range (0, 10, splits=8)
{code}

**After**
{code}
scala> spark.range(10).repartition(1, $"id").repartition(1, $"id").explain
== Physical Plan ==
Exchange hashpartitioning(id#0L, 1)
+- *Range (0, 10, splits=8)
{code}



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