Github user NicoK commented on a diff in the pull request:
https://github.com/apache/flink/pull/3272#discussion_r99614763
--- Diff: docs/dev/stream/state.md ---
@@ -113,9 +113,19 @@ be retrieved using `Iterable<T> get()`.
added to the state. The interface is the same as for `ListState` but
elements added using
`add(T)` are reduced to an aggregate using a specified `ReduceFunction`.
+* `FoldingState<T, ACC>`: This keeps a single value that represents the
aggregation of all values
+added to the state. Contrary to `ReducingState`, the aggregate type is
different from the type of
--- End diff --
...the aggregate type **may be** different from...
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