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https://issues.apache.org/jira/browse/BEAM-3003?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16190251#comment-16190251
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Luke Cwik commented on BEAM-3003:
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There is also the problem that we aren't serializing the provided key with the
coder and instead rely on Java serialization.
> In WithKeys, get coder for key more safely.
> -------------------------------------------
>
> Key: BEAM-3003
> URL: https://issues.apache.org/jira/browse/BEAM-3003
> Project: Beam
> Issue Type: Improvement
> Components: sdk-java-core
> Reporter: Daniel Oliveira
> Priority: Minor
> Labels: starter
>
> In WithKeys.java currently the coder for the key type is chosen when the
> transform is expanded. This means that there's no way to directly get the
> type of the input elements, instead the type is inferred from the function or
> from a java Class<> object. This means there can be mismatches between the
> actual type of the input and the coder used.
> WithKeys should be refactored to retrieve the coder in a safer way and avoid
> the possibility of mismatches.
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