Github user asfgit closed the pull request at:
https://github.com/apache/incubator-beam/pull/680
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GitHub user lukecwik opened a pull request:
https://github.com/apache/incubator-beam/pull/680
[BEAM-468] NullableCoder should not ask valueCoder
isRegisterByteSizeObserverCheap when value is null
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