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From Fabian Hueske <fhue...@gmail.com>
Subject Re: cogroup
Date Mon, 29 Jun 2015 15:58:07 GMT
If you just want to do the pairwise comparison try join().
Join is an inner join and will give you all pairs of elements with matching
keys.
For CoGroup, there is no other way than collecting one side in memory.

Best, Fabian

2015-06-29 17:42 GMT+02:00 Matthias J. Sax <mjsax@informatik.hu-berlin.de>:

> Why do you not use a join? CoGroup seems not to be the right operator.
>
> -Matthias
>
> On 06/29/2015 05:40 PM, Michele Bertoni wrote:
> > Hi I have a question on cogroup
> >
> > when I cogroup two dataset is there a way to compare each element on the
> left with each element on the right (inside a group) without collecting one
> side?
> >
> > right now I am doing
> >
> > left.cogroup(right).where(0,1,2).equalTo(0,1,2){
> >       (leftIterator, rightIterator, out) => {
> >               val lSet = leftIterator.toSet           // <———— toSet
> >               for(r <- rightIterator)
> >                       for(l <- lSet)
> >                               //do something
> >       }
> > }
> >
> > I would like to avoid the toSet
> >
> >
> > thanks for help
> >
>
>

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