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https://issues.apache.org/jira/browse/FLINK-2968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14989771#comment-14989771
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ASF GitHub Bot commented on FLINK-2968:
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Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1328#issuecomment-153772340
If you add it in `AbstractUdfStreamOperator` then you can remove the
`setOutputType` in `WindowOperator` and `NonKeyedWindowOperator`.
> 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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