Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/5147#issuecomment-85392750
> In general we have avoided exposing Partition's directly to users.
Users can get access to Partition objects by implementing custom RDDs, so I
suppose a third-party library could expose something like
`mapPartitionsWithPartition`, and then use that to construct arguments to a
ProcessBuilder, etc.
> Since this can be implemented as a helper function outside Spark, maybe
this doesn't need to go into the core API itself?
In retrospect, most of the PipedRDD enhancements probably should have gone
into libraries rather than core, since the current API is already kind of
unwieldy.
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