Github user StefanRRichter commented on the issue:
https://github.com/apache/flink/pull/3359
One additional comment, also as reminder for @aljoscha and me: after this
PR is rebased, we have access to `InternalKeyContext`, which should be somehow
integrated with the already existing `KeyContext` interface. This would reduce
several constructor parameters and some members, e.g. the `KeyGroupRange`s and
`TypeSerializer<K>`s.
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