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https://issues.apache.org/jira/browse/BEAM-44?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Groh resolved BEAM-44.
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Resolution: Fixed
> Return the input coder in NullableCoder.of() if it is a NullableCoder
> ---------------------------------------------------------------------
>
> Key: BEAM-44
> URL: https://issues.apache.org/jira/browse/BEAM-44
> Project: Beam
> Issue Type: Improvement
> Components: sdk-java-core
> Reporter: Thomas Groh
> Assignee: Thomas Groh
> Priority: Trivial
>
> {{NullableCoder.of(NullableCoder.of(foo))}} returns a nested
> {{NullableCoder}}, which appends two "present" bytes before null values. The
> second coder is unnecessary, and does not need to be provided. Instead, in
> the factory method, return the input coder if it is already a
> {{NullableCoder}}.
> {code}
> NullableCoder<T> of(Coder<T> coder) {
> if (coder instanceof NullableCoder) return coder;
> }
> {code}
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