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https://issues.apache.org/jira/browse/BEAM-3807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546891#comment-17546891
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Kenneth Knowles commented on BEAM-3807:
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This issue has been migrated to https://github.com/apache/beam/issues/18703
> SerializableCoder#structuralValue should be more effective for types which
> don't define an equals method
> --------------------------------------------------------------------------------------------------------
>
> Key: BEAM-3807
> URL: https://issues.apache.org/jira/browse/BEAM-3807
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Thomas Groh
> Priority: P3
> Labels: Clarified
>
> Specifically, types which don't implement an equals method (or more loosely,
> types which use the Object equals method) should either implement
> {{#structuralValue}} via using encoded bytes, or require the use of an
> {{Equivalence}} (like the guava definition).
>
> It should always be that the following snippet (or its approximation) returns
> {{true}}:
> {{<T> expected(Coder<T> myCoder, }}{{T myElement)}}
> {{byte[] elementBytes = CoderUtils.serializeToByteArray(myCoder, myElement);}}
> {{T decodedFirst = CoderUtils.deserializeFromByteArray(myCoder,
> elementBytes);}}
> {{T decodedSecond = CoderUtils.deserializeFromByteArray(myCoder,
> elementBytes);}}
> {{myCoder.structuralValue(decodedFirst).equals(myCoder.structuralValue(decodedScond));}}
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