Github user concretevitamin commented on the pull request:
https://github.com/apache/spark/pull/5568#issuecomment-94624336
Thanks @hlin09 - one high-level question: do you have an intended use case
in mind for arbitrary / large arity functions? In Spark's Scala API up to 4
RDDs are supported, which has perf. benefits (avoid an union + shuffle).
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