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https://issues.apache.org/jira/browse/FLINK-4016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15320140#comment-15320140
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Aljoscha Krettek commented on FLINK-4016:
-----------------------------------------
[~rvdwenden] If you have a fix, please open a new PR against FLINK-3977.
> FoldApplyWindowFunction is not properly initialized
> ---------------------------------------------------
>
> Key: FLINK-4016
> URL: https://issues.apache.org/jira/browse/FLINK-4016
> Project: Flink
> Issue Type: Bug
> Components: DataStream API
> Affects Versions: 1.0.3
> Reporter: RWenden
> Priority: Blocker
> Labels: easyfix
> Fix For: 1.1.0
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> FoldApplyWindowFunction's outputtype is not set.
> We're using constructions like (excerpt):
> .keyBy(0)
> .countWindow(10, 5)
> .fold(...)
> Running this stream gives an runtime exception in FoldApplyWindowFunction:
> "No initial value was serialized for the fold window function. Probably the
> setOutputType method was not called."
> This can be easily fixed in WindowedStream.java by (around line# 449):
> FoldApplyWindowFunction foldApplyWindowFunction = new
> FoldApplyWindowFunction<>(initialValue, foldFunction, function);
> foldApplyWindowFunction.setOutputType(resultType,
> input.getExecutionConfig());
> operator = new EvictingWindowOperator<>(windowAssigner,
>
> windowAssigner.getWindowSerializer(getExecutionEnvironment().getConfig()),
> keySel,
>
> input.getKeyType().createSerializer(getExecutionEnvironment().getConfig()),
> stateDesc,
> new
> InternalIterableWindowFunction<>(foldApplyWindowFunction),
> trigger,
> evictor);
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