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changes.mady.by.user Wencong Liu

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Motivation

In DataStream API, a non-keyed DataStream can be transformed into a KeyedStream through keyBy, and then further transformed into a WindowedStream through window operations. WindowedStream enables window processing on records with the same key. With the improvement of FLIP-331, WindowedStream will support the full window processing by the window assigner EndOfStreamWindows for which the which the window is only triggered at the end of inputs.

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