[jira] [Created] (FLINK-2968) Windowed fold operation fails because the initial value was not serialized

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-2968:
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             Summary: Windowed fold operation fails because the initial value was not serialized
                 Key: FLINK-2968
                 URL: https://issues.apache.org/jira/browse/FLINK-2968
             Project: Flink
          Issue Type: Bug
    Affects Versions: 0.10
            Reporter: Till Rohrmann
            Assignee: Till Rohrmann


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.



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