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https://issues.apache.org/jira/browse/FLINK-4016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15319181#comment-15319181
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RWenden commented on FLINK-4016:
--------------------------------
I already made a commit with message
<https://github.com/rvdwenden> [FLINK-3977] initialize FoldApplyWindowFunction
properly
<https://github.com/apache/flink/commit/1181e1cf9491107ce9f466d6e2f3bebfc3e17d06>but
it stays visible in TravisCI under [FLINK-4016] initialize
FoldApplyWindowFunction properly
<https://github.com/apache/flink/commit/ec5eb4890201d6d0c9d91510f3b078a681d5a317>
Please consider this as a fix under [FLINK-3977].
Regards, RvdWenden
> 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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