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From Elias Levy <fearsome.lucid...@gmail.com>
Subject Why don't operations on KeyedStream return KeyedStream?
Date Tue, 28 Aug 2018 17:52:27 GMT
Operators on a KeyedStream don't return a new KeyedStream.  Is there a
reason for this?  You need to perform `keyBy` again to get a KeyedStream.
Presumably if you key by the same value there won't be any shuffled data,
but the key may no longer be available within the stream record.

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