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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