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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2016/06/19 01:12:05 UTC
[jira] [Commented] (SPARK-16052) Add CollapseRepartitionBy
optimizer
[ https://issues.apache.org/jira/browse/SPARK-16052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15338309#comment-15338309 ]
Apache Spark commented on SPARK-16052:
--------------------------------------
User 'dongjoon-hyun' has created a pull request for this issue:
https://github.com/apache/spark/pull/13765
> 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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