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Posted to user@storm.apache.org by Josh J <jo...@gmail.com> on 2014/08/07 16:50:53 UTC

trident custom groupby

Hi,

I would like to customize the trident groupby, so that the tuples are
grouped by a customized function (e.g. first three letters of the string).
How can I customize the behavior of groupby?

Thanks,
Josh

Re: trident custom groupby

Posted by Romain Leroux <le...@gmail.com>.

You make a function to extract the first three letters of your string in a
new field and group by on that field.


2014-08-07 23:50 GMT+09:00 Josh J <jo...@gmail.com>:

> Hi,
>
> I would like to customize the trident groupby, so that the tuples are
> grouped by a customized function (e.g. first three letters of the string).
> How can I customize the behavior of groupby?
>
> Thanks,
> Josh
>