Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/4228#issuecomment-71785338
Not a very strong preference, but my take would be to keep them separate as
you only want users to use `treeReduce` when they know they want an aggregation
tree. Also the way `reduce` works right now is very familiar to existing users
and it'll be better not to touch that or add extra options to it etc.
Also thanks @mengxr for pulling this out to core. I've definitely found
this useful in many other places
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