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From Gabriel Reid <gabriel.r...@gmail.com>
Subject Re: Ability to specify a combiner (with different signature than reducer)
Date Wed, 25 Sep 2013 09:37:31 GMT
Hi Chao,


> Your approach is tricky. I agree that this kind of MR logic is pretty
> common. So it would be nice to add such feature to crunch. At the first
> glance, I think the problem in PTable#collectValues is that it return a
> PTable rather than a PGroupedTable (I haven't check the internal logic yet).
>
>
I think that PTable#collectValues is for a different kind of use case --
internally it just does a groupByKey and then puts all the values in a
single collection for each key, so I'm not sure how it would apply here. Or
did you mean the combineValues method?

- Gabriel

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