Github user koertkuipers commented on the issue:
https://github.com/apache/spark/pull/13526
the tricky part with that is that (ds: Dataset[(K,
V)]).groupBy(_._1).mapValues(_._2) should return a
KeyValueGroupedDataset[K, V]
On Tue, Jun 7, 2016 at 8:22 PM, Wenchen Fan <[email protected]>
wrote:
> A possible approach maybe just keep the function given by mapValues, and
> apply it before calling the function given by mapGroups. By doing this,
> we at least won't make the performance worse, as the underlying plan
> doesn't change.
>
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