IN- The type of the input value.
OUT- The type of the output value.
KEY- The type of the key.
W- The type of
Windowthat this window function can be applied on.
@Public public interface WindowFunction<IN,OUT,KEY,W extends Window> extends Function, Serializable
key- The key for which this window is evaluated.
window- The window that is being evaluated.
input- The elements in the window being evaluated.
out- A collector for emitting elements.
Exception- The function may throw exceptions to fail the program and trigger recovery.
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