Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3191#discussion_r98025175
--- Diff: docs/dev/windows.md ---
@@ -27,9 +27,13 @@ Windows are at the heart of processing infinite streams.
Windows split the strea
over which we can apply computations. This document focuses on how
windowing is performed in Flink and how the
programmer can benefit to the maximum from its offered functionality.
-The general structure of a windowed Flink program is presented below. This
is also going to serve as a roadmap for
-the rest of the page.
+The general structure of a windowed Flink program is presented below. The
first snippet refers to *keyed* streams,
+while the second to *non-keyed* ones. As one can see, the only difference
is the `keyBy(...)` call for the keyed streams
+and the `window(...)` which becomes `windowAll(...)` for non-keyed
streams. These is also going to serve as a roadmap
+for the rest of the page.
+ //---------------------- KEYED STREAMS ----------------------//
--- End diff --
`KEYED STREAMS` -> `KEYED WINDOWS` as in the section heading below
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