Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/4634#issuecomment-74774029
If I understand correctly, the need is for an operator with an optional
map-side combine. The
alternative is to force the user to choose between `groupByKey` and
`aggregateByKey`. @pwendell maybe you have an opinion on whether we should
expose something like this?
If we do choose to expose this, I think it would be better to allow
specifying no map-side combine in `aggregateByKey` than to encourage use of
`combineByKey`.
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