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https://issues.apache.org/jira/browse/SPARK-1540?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matei Zaharia resolved SPARK-1540.
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Resolution: Fixed
Resolved here: https://github.com/apache/spark/pull/487/files. We were able to
add an implicit Ordering to most methods while giving it a default value of
null, which will allow these to work on un-orderble types too using the
current, less efficient code path.
> 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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