Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3191#discussion_r98026366
--- Diff: docs/dev/windows.md ---
@@ -312,9 +328,9 @@ Time intervals can be specified by using one of
`Time.milliseconds(x)`, `Time.se
they are evaluated differently than tumbling and sliding windows.
Internally, a session window operator
creates a new window for each arriving record and merges windows together
if their are closer to each other
than the defined gap.
-In order to be mergable, a session window operator requires a mergable
[Trigger](#triggers) and a mergable
+In order to be mergeable, a session window operator requires a merging
[Trigger](#triggers) and a merging
[Window Function](#window-functions), such as `ReduceFunction` or
`WindowFunction`
-(`FoldFunction` is not mergable.)
+(`FoldFunction` is not mergeable.)
--- End diff --
"`FoldFunction` cannot merge" ?
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