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To express the semantics of full window processing on DataStream, we need to define the corresponding method in DataStream class. One approach is to directly add a window(WindowAssigner assigner) method. This method only supports passing the EndOfStreamWindows introduced in FLIP-331. In the The corresponding job code , if full window processing is desired, the corresponding code should will be dataStream.window(EndOfStreamWindows.get()) if full window processing is desired.

However, this approach may lead users to mistakenly pass window assigners other than EndOfStreamWindows to the method, which is not supported.

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