Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/6231#issuecomment-103632186
Got it, yeah this is actually generic to all distributed scenarios, where
the idea of folding left-to-right either doesn't make sense or is expensive to
do. I'll update all the docs to note that the op must be commutative and that
this isn't quite like Scala's `fold()` as a result.
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