Github user markhamstra commented on the pull request:
https://github.com/apache/spark/pull/3632#issuecomment-67757353
On a first pass, this doesn't look right. If you are providing additional
methods that should be available for `RDD[(K, V)]` where there is an `Ordering`
available for both `K` and `V`, then it seems that the strategy that you should
be following should not be to add methods directly to `PairRDD`, but rather to
go one step further than does `OrderedRDD`, whose purpose is to provide
additional methods for `RDD[(K, V)]` where there is an `Ordering` available for
`K`.
Please read this comment:
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/rdd/OrderedRDDFunctions.scala#L26
...and look at how the `Ordering` context bound is used:
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/rdd/OrderedRDDFunctions.scala#L26
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/rdd/OrderedRDDFunctions.scala#L26
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