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https://issues.apache.org/jira/browse/SPARK-1540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13979393#comment-13979393
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Matei Zaharia commented on SPARK-1540:
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Note that it will remain to add this to the Java and Python APIs. But in those
it can be done through new versions of methods, so it will be doable in a
binary-compatible way.
> Investigate whether we should require keys in PairRDD to be Comparable
> ----------------------------------------------------------------------
>
> Key: SPARK-1540
> URL: https://issues.apache.org/jira/browse/SPARK-1540
> Project: Spark
> Issue Type: New Feature
> Reporter: Matei Zaharia
> Assignee: Matei Zaharia
> Priority: Blocker
> Fix For: 1.0.0
>
>
> This is kind of a bigger change, but it would make it easier to do sort-based
> versions of external operations later. We might also get away without it.
> Note that sortByKey() already does require an Ordering or Comparables.
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