Github user hlin09 commented on the pull request:
https://github.com/apache/spark/pull/5568#issuecomment-94856698
I do have some user cases that would best to have more that 4 arity zip
function. Another concern is that the current communication pattern between
Spark and R does not allows tuples of more than RDDs. From perf point of view,
"union + shuffle" might be better than recursively zip 2 of them.
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