[jira] [Created] (FLINK-3521) Make Iterable part of method signature for WindowFunction

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-3521:
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             Summary: Make Iterable part of method signature for WindowFunction
                 Key: FLINK-3521
                 URL: https://issues.apache.org/jira/browse/FLINK-3521
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
            Reporter: Aljoscha Krettek
            Assignee: Aljoscha Krettek
            Priority: Blocker


After discussion with [~StephanEwen],[~rmetzger], [~fhueske] it was decided that the signature of WindowFunction should be changed.

Right now, the signature is {{WindowFunction<IN, OUT, KEY, WINDOW>}}. With the decision of whether the input is an {{Iterable}} nor not residing in the signature of the method on {{WindowedStream}}, for example:
 - {{WindowedStream.apply(WindowFunction<Iterable<IN>>, OUT, KEY, WINDOW>}}
 - {{WindowedStream.apply(ReduceFunction, WindowFunction<IN, OUT, KEY, WINDOW>}}

The {{Iterable<>}} should be moved into the signature of the {{apply}} method, so that it is:
{{void apply(KEY key, W window, Iterable<IN> input, Collector<OUT> out)}}



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