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https://issues.apache.org/jira/browse/BEAM-2959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16183085#comment-16183085
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ASF GitHub Bot commented on BEAM-2959:
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Github user asfgit closed the pull request at:
https://github.com/apache/beam/pull/3904
> Fix proto enums to not use 0 for a valid value
> ----------------------------------------------
>
> Key: BEAM-2959
> URL: https://issues.apache.org/jira/browse/BEAM-2959
> Project: Beam
> Issue Type: Bug
> Components: beam-model
> Reporter: Luke Cwik
> Assignee: Luke Cwik
>
> Proto3 uses 0 as the default value for enums and does not encode it on the
> wire which means that you can not detect the difference between a value that
> is unset and an enum that is set but has a value of zero.
> Defining an "YYY_UNSPECIFIED" is considered a best practice. Unfortunately
> this is not done automatically because of proto2 compatibility within proto3.
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