Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/3207#discussion_r97776155
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/WindowedStream.java
---
@@ -515,12 +515,16 @@ public WindowedStream(KeyedStream<T, K> input,
//
------------------------------------------------------------------------
/**
- * 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.
+ * Applies the given aggregation function to each window. The
aggregation function is called for
+ * each element, aggregating values incrementally and keeping the state
to one accumulator
+ * per key and window.
*
* @param function The fold function.
--- End diff --
Pre-existing typo: "fold function".
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