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https://issues.apache.org/jira/browse/BEAM-247?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Davor Bonaci closed BEAM-247.
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Resolution: Not A Bug
> CombineFn's only definable/usable inside sdk.transforms package
> ---------------------------------------------------------------
>
> Key: BEAM-247
> URL: https://issues.apache.org/jira/browse/BEAM-247
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Ben Chambers
> Assignee: Pei He
> Priority: Critical
>
> {code:java}
> public abstract static class CombineFn<InputT, AccumT, OutputT>
> extends AbstractGlobalCombineFn<InputT, AccumT, OutputT> { /* ... */ }
> abstract static class AbstractGlobalCombineFn<InputT, AccumT, OutputT>
> implements GlobalCombineFn<InputT, AccumT, OutputT>, Serializable { /* ...
> */ }
> {code}
> Since {{AbstractGlobalCombineFn}} is package protected (and therefore not
> visible outside of the {{transform}} package, it is not possible to cast any
> class that extends {{CombineFn}} to a {{GlobalCombineFn}} outside of this
> package.
> This prevents applying existing {{CombineFns}} directly (such as
> {{Combine.perKey(new Sum.SumIntegersFn())}}, as used in our documentation)
> and also means that a user cannot define their own {{CombineFn}} unless they
> put them in the {{transform}} package.
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