[jira] [Created] (FLINK-13928) Make windows api more extendable

[Shang Yuanchun (Jira)]

zhihao zhang created FLINK-13928:
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             Summary: Make windows api more extendable
                 Key: FLINK-13928
                 URL: https://issues.apache.org/jira/browse/FLINK-13928
             Project: Flink
          Issue Type: Improvement
          Components: API / DataStream
    Affects Versions: 1.9.0
            Reporter: zhihao zhang
             Fix For: 2.0.0


I'm creating my own TimeWindow those days, which extends from `TimeWindow`, but the new TimeWindow does not work well with existing windows API. 

For example, my own TimeWindow does not work with `DynamicEventTimeSessionWindows`, because 

{code:java}
public class DynamicEventTimeSessionWindows<T> extends MergingWindowAssigner<T, TimeWindow> {}
{code}

`DynamicEventTimeSessionWindows` does not accept my TimeWindow.

So my proposal is

{code:java}
public class DynamicEventTimeSessionWindows<T, W extends TimeWindow> extends MergingWindowAssigner<T, W> {}
{code}


If this ticket is ok to go, I would like to take it.



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