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Hi all,

I have a PGroupedTable<A,B> and I want to aggregate / combine the values to
produce a PCollection<C> - in other words, I need the type of the aggregate
to be different to the original value type.

What's the best approach? The combineValues method takes either an
Aggregator or a CombineFn but as far as I can see, both of these assume the
end result will be of the same type as the values.

Have I missed something?

Cheers,
Dave