Github user aarondav commented on the pull request:
https://github.com/apache/spark/pull/242#issuecomment-38769996
We are trying to cement the API for 1.0. This will allow us to provide an
actual iterator-based implementation later that does not materialize all the
values for a single group-by key at once, for instance. With our current
Seq-based solution, we have basically no choice but to OOM now and for any
future implementation if the values are too large to fit in memory.
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