Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1255#discussion_r44403426
--- Diff: docs/apis/dataset_transformations.md ---
@@ -1981,6 +1981,41 @@ Not supported.
</div>
</div>
+### Range-Partition
+
+Range-partitions a DataSet on a given key.
+Keys can be specified as key expressions or field position keys (see
[Reduce examples](#reduce-on-grouped-dataset) for how to specify keys).
--- End diff --
should be "position keys, expression keys, and key selector functions".
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