Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/4634#issuecomment-76772994
I don't know if there's an explicit guideline, but I assume the goal is to
provide as much uniformity across languages as makes sense, yes.
What if someone really does want to make an initial value per key a
function of one of the input values? If `combineByKey` goes away, you can't do
that anymore, it seems. Or is the argument that this just is never needed?
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