Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/3392
@greghogan You are right, this is a bit of an undefined zone here.
In the distributed runtime, all the `Iterables` can be used only once
(because of once consumable streams behind them). This affects the "collection
execution" where in theory no such restriction exists. The PR makes the
behavior consistent across the two execution models.
Strictly speaking, it does change user-facing behavior for cases that rely
on the fact that the "collection execution" allows multiple traversals. We
never defined whether such "environment-specific behavior" is considered part
of the stability contract or not.
What do you think?
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