HI Stefan,
On Jun 7, 2015, at 10:07 PM, Stefan Zobel <[email protected]> wrote:
> I'm still trying to wrap my head around the test logic for the (par & !ord)
> && (op == WhileOp.Drop) case
> in the whileResultAsserter() method in WhileOpTest.
>
> Wouldn't it be possible that, for an unordered parallel stream, dropWhile()
> won't drop anything at all (i.e.,
> drops an empty set)?
>
Yes.
> In that case, input.size() == output.size() and the set of matching output
> elements is no longer a _proper_ subset
> of the set of matching input elements. The whileResultAsserter() would fail
> even though dropWhile() works correctly
> (in a nondeterministic sense)?
>
> It's a bit late now and I guess it's all in my imagination. Still curious
> ...
>
I don't think you are imagining things, thanks for looking. The proper subset
is incorrect, i confused myself :-)
For example, if we have the input set {1, 2, 3} and the predicate i < 3, then a
valid output set is {1, 2, 3} if the imputed order observed is [3, 2, 1] or [3,
1, 2]
I adjusted the test code accordingly.
Thanks,
Paul.
