Why not this:
Y = foreach X { ..
t = distinct ...
generate t, foo...
}
Z = filter Y by isEmpty(t);
OR: t can't be empty if the thing you are distincting is not empty, so this
should work:
Y = filter X by IsEmpty(thing_you_wanted_to_distinct);
Z = foreach Y {
-- the thing you are distincting is now guaranteed to have at least 1
value
t = distinct ..
generate foo...
}
On Sun, Oct 2, 2011 at 9:28 AM, Stan Rosenberg <
[email protected]> wrote:
> Hi Folks,
>
> I came across a use case where I'd like to do something like this:
>
> FOREACH X {
> ...
> t = DISTINCT (...)
> if (!IsEmpty(t))
> GENERATE foo, ...
> }
>
> Thus, 'generate' is conditionally executed and the control flow depends on
> the value of some tuple 't'.
> Can this be done in pig?
>
> Thanks,
>
> stan
>
> P.S. Please ignore my previous email; I accidentally triggered send before
> I
> had a chance to finish it.
>
