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https://issues.apache.org/jira/browse/SPARK-18038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15593583#comment-15593583
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Reynold Xin commented on SPARK-18038:
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It definitely does.
> Move output partitioning definition from UnaryNodeExec to its children
> ----------------------------------------------------------------------
>
> Key: SPARK-18038
> URL: https://issues.apache.org/jira/browse/SPARK-18038
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.0.1
> Reporter: Tejas Patil
> Priority: Trivial
>
> This was a suggestion by [~rxin] over one of the dev list discussion :
> http://apache-spark-developers-list.1001551.n3.nabble.com/Project-not-preserving-child-partitioning-td19417.html
> {noformat}
> I think this is very risky because preserving output partitioning should not
> be a property of UnaryNodeExec (e.g. exchange).
> It would be better (safer) to move the output partitioning definition into
> each of the operator and remove it from UnaryExecNode.
> {noformat}
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