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https://issues.apache.org/jira/browse/SPARK-11878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15015383#comment-15015383
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Apache Spark commented on SPARK-11878:
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User 'saucam' has created a pull request for this issue:
https://github.com/apache/spark/pull/9858
> Eliminate distribute by in case group by is present with exactly the same
> grouping expressions
> ----------------------------------------------------------------------------------------------
>
> Key: SPARK-11878
> URL: https://issues.apache.org/jira/browse/SPARK-11878
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Yash Datta
> Priority: Minor
>
> For queries like :
> select <> from table group by a distribute by a
> we can eliminate distribute by ; since group by will anyways do a hash
> partitioning
> Also applicable when user uses Dataframe API but the number of partitions in
> RepartitionByExpression is not specified (None)
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