Github user aljoscha commented on a diff in the pull request: https://github.com/apache/flink/pull/3207#discussion_r97775252 --- Diff: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/AllWindowedStream.java --- @@ -279,6 +286,202 @@ public AllWindowedStream(DataStream<T> input, return input.transform(opName, resultType, operator).forceNonParallel(); } + // ------------------------------------------------------------------------ + // AggregateFunction + // ------------------------------------------------------------------------ + + /** + * Applies the given fold function to each window. The window function is called for each + * evaluation of the window for each key individually. The output of the reduce function is + * interpreted as a regular non-windowed stream. + * + * @param function The fold function. --- End diff -- Typo: "fold function"
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