THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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One thing to note is: broadcast can only be used as side-input of other Inputs and cannot be directly converted to other streams.
ProcessFunction
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Once we have the data stream, we can apply operations on it. The operations that can be performed over DataStream are collectively called Process Function. It is the only entrypoint for defining all kinds of processings on the data streams.
Classification of ProcessFunction
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