groupBy / reduceBy

[Remi Forax]

On 12/09/2012 04:55 PM, Brian Goetz wrote:
>> the other problem with reduceBy is that the combiner is only needed for
>> the parallel case but not for the serial one.
>
> Which is true for other nonhomogeneous reducer forms as well.

Yes, these reducers are ugly too :)
I think it's better to specify a mapping function (T -> U) and a 
combiner (U, U -> U).

cheers,
Rémi