[jira] [Commented] (BEAM-2989) Improve coder inference for WithKeys.of(null)

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-2989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16190126#comment-16190126 ] 

ASF GitHub Bot commented on BEAM-2989:
--------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/beam/pull/3922


> Improve coder inference for WithKeys.of(null)
> ---------------------------------------------
>
>                 Key: BEAM-2989
>                 URL: https://issues.apache.org/jira/browse/BEAM-2989
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-java-core
>            Reporter: Luke Cwik
>            Assignee: Daniel Oliveira
>            Priority: Minor
>             Fix For: 2.2.0
>
>
> WithKeys.<Void, String>of((Void) null)) should choose a VoidCoder as the key coder instead of erroring out.
> {code:java}
> java.lang.IllegalStateException: Unable to return a default Coder for
> <transform> [PCollection]. Correct one of the following root causes:
>   No Coder has been manually specified;  you may do so using .setCoder().
>   Inferring a Coder from the CoderRegistry failed: Cannot provide coder for
> parameterized type org.apache.beam.sdk.values.KV<K, V>: Unable to provide a
> Coder for K.
> {code}
> [WithKeysTest#testConstantKeys|https://github.com/apache/beam/blob/352f106f992a2ff4c08274685657242f04f967ef/sdks/java/core/src/test/java/org/apache/beam/sdk/transforms/WithKeysTest.java#L87] but using a Void key type should pass coder inference.



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