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https://issues.apache.org/jira/browse/SPARK-9702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14661532#comment-14661532
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Apache Spark commented on SPARK-9702:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/8030
> Repartition operator should use Exchange to perform its shuffle
> ---------------------------------------------------------------
>
> Key: SPARK-9702
> URL: https://issues.apache.org/jira/browse/SPARK-9702
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Josh Rosen
>
> Spark SQL's {{Repartition}} operator is implemented in terms of Spark Core's
> repartition operator, which means that it has to perform lots of unnecessary
> row copying and inefficient row serialization. Instead, it would be better if
> this was implemented using some of Exchange's internals so that it can avoid
> row format conversions and generic getters / hashcodes.
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