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https://issues.apache.org/jira/browse/FLINK-11090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16714716#comment-16714716
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Aljoscha Krettek commented on FLINK-11090:
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We could also remove it, since it's {{PublicEvolving}} and not {{Public}}.
Plus, this method is not really used by users directly, it's more of an
internal method to be called by the Scala API.
> Unused parameter in WindowedStream.aggregate()
> ----------------------------------------------
>
> Key: FLINK-11090
> URL: https://issues.apache.org/jira/browse/FLINK-11090
> Project: Flink
> Issue Type: Improvement
> Components: DataStream API
> Reporter: Hequn Cheng
> Assignee: Hequn Cheng
> Priority: Major
>
> The {{aggregateResultType}} parameter in {{WindowedStream.aggregate()}} seems
> useless. Or what have I missed?
> If it is useless, I prefer to remove the parameter by adding a new API and
> deprecate the current one. We can't remove it directly as it is
> PublicEvolving.
> {code:java}
> @PublicEvolving
> public <ACC, V, R> SingleOutputStreamOperator<R> aggregate(
> AggregateFunction<T, ACC, V> aggregateFunction,
> ProcessWindowFunction<V, R, K, W> windowFunction,
> TypeInformation<ACC> accumulatorType,
> TypeInformation<V> aggregateResultType,
> TypeInformation<R> resultType) {
> }
> {code}
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