Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/136#issuecomment-37888440
Oh I see, I didn't realize that `partitions` only had only the tail of the
partitions for each Partition object. Note that one problem with this is
quadratic memory size -- if you call `sliding` on an RDD with 1000 partitions,
you get O(1000^2) space used by the various arrays. It would be better to keep
a reference to the same array and search through it starting at a new index.
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