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From Gábor Gévay <gga...@gmail.com>
Subject Re: Multi-field "sum" function just like "keyBy"
Date Tue, 07 Jun 2016 13:13:52 GMT
Hello,

In the case of "sum", you can just specify them one after the other, like:

stream.sum(1).sum(2)

This works, because summing the two fields are independent. However,
in the case of "keyBy", the information is needed from both fields at
the same time to produce the key.

Best,
Gábor



2016-06-07 14:41 GMT+02:00 Al-Isawi Rami <Rami.Al-Isawi@comptel.com>:
> Hi,
>
> Is there any reason why “keyBy" accepts multi-field, while for example “sum” does
not.
>
> -Rami
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