Details
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Bug
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Status: Closed
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Major
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Resolution: Fixed
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0.10.0
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None
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None
Description
The windowed fold operation currently fails because the initial value was not serialized. The reason for this is that the fold operation is realized as a WindowFunction within an AbstractUdfStreamOperator and does not get the output type information forwarded (which is necessary for the serialization).
The solution is to let the AbstractUdfStreamOperator forward the output type information to the WindowFunction if it implements the OutputTypeConfigurable interface.