Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/1254#issuecomment-47419953
Thanks - I can see why this might be useful, but it is a pretty high bar
now to add new APIs to the RDD interface, and we need to be very careful about
APIs that might have very bad performance behaviors (dropping a large number
can be very slow, in particular if it crosses many partitions).
For this reason, it might make more sense for this to be an example program
or a blog post that's easily indexable so people can find.
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