Hello all,
I am trying to write a reduce function which takes the map fn output
(k1, v11),
(k1, v12),
(k1, v13),
(k2, v21),
(k2, v22),
(k3,v31)
and produces as a result of the reduce
{
k1: [v11,v12,v13],
k2: [v21,v22],
k3: [v31]
}
where v11 etc could themselves be lists and do not need to be unpacked in
the final result but can stay as nested list of lists.
But I am lost as far as the (keys, values, rereduce) signature.
So far I have managed by just reusing the return sum(values) on numeric
values, but this is different and I need some conceptual help with
reduce/rereduce for non-numeric values and grouping into lists instead of
taking the sum.
Thanks much,
Nitin
37% of all statistics are made up on the spot
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Nitin Borwankar
[email protected]
