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https://issues.apache.org/jira/browse/SPARK-2617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14070066#comment-14070066
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Apache Spark commented on SPARK-2617:
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User 'mengxr' has created a pull request for this issue:
https://github.com/apache/spark/pull/1526
> Correct doc and usage of preservesPartitioning
> ----------------------------------------------
>
> Key: SPARK-2617
> URL: https://issues.apache.org/jira/browse/SPARK-2617
> Project: Spark
> Issue Type: Bug
> Components: Documentation, MLlib, Spark Core
> Affects Versions: 1.0.1
> Reporter: Xiangrui Meng
> Assignee: Xiangrui Meng
>
> The name `preservesPartitioning` is ambiguous: 1) preserves the indices of
> partitions, 2) preserves the partitioner. The latter is correct and
> `preservesPartitioning` should really be called `preservesPartitioner`.
> Unfortunately, this is already part of the API and we cannot change.
> We should be clear in the doc and fix wrong usages.
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