[jira] [Created] (FLINK-3869) WindowedStream.apply with FoldFunction is too restrictive

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-3869:
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             Summary: WindowedStream.apply with FoldFunction is too restrictive
                 Key: FLINK-3869
                 URL: https://issues.apache.org/jira/browse/FLINK-3869
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
            Reporter: Aljoscha Krettek
            Assignee: Aljoscha Krettek


Right now we have this signature:
{code}
public <R> SingleOutputStreamOperator<R> apply(R initialValue, FoldFunction<T, R> foldFunction, WindowFunction<R, R, K, W> function) {
{code}

but we should have this signature to allow users to return a type other than the fold accumulator type from their window function:
{code}
public <ACC, R> SingleOutputStreamOperator<R> apply(ACC initialValue, FoldFunction<T, ACC> foldFunction, WindowFunction<ACC, R, K, W> function) {
{code}



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