pyflink.datastream.data_stream.KeyedStream.window#
- KeyedStream.window(window_assigner: WindowAssigner) WindowedStream[source]#
Windows this data stream to a WindowedStream, which evaluates windows over a key grouped stream. Elements are put into windows by a WindowAssigner. The grouping of elements is done both by key and by window.
A Trigger can be defined to specify when windows are evaluated. However, WindowAssigners have a default Trigger that is used if a Trigger is not specified.
- Parameters:
window_assigner – The WindowAssigner that assigns elements to windows.
- Returns:
The trigger windows data stream.