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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