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https://issues.apache.org/jira/browse/SPARK-21317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16074813#comment-16074813
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Apache Spark commented on SPARK-21317:
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User 'pwoody' has created a pull request for this issue:
https://github.com/apache/spark/pull/18542
> Avoid unnecessary sort in FileFormatWriter if data is already bucketed
> ----------------------------------------------------------------------
>
> Key: SPARK-21317
> URL: https://issues.apache.org/jira/browse/SPARK-21317
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.1
> Reporter: Patrick Woody
>
> When bucketing in FileFormatWriter, the partition is always sorted on
> bucketIdExpression, the partition id produced by the hash bucketing. If the
> data is already bucketed in that format, then this expression will be
> constant so there is no need to sort.
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