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From "Daniel Oliveira (JIRA)" <j...@apache.org>
Subject [jira] [Created] (BEAM-3003) In WithKeys, get coder for key more safely.
Date Fri, 29 Sep 2017 20:56:16 GMT
Daniel Oliveira created BEAM-3003:
-------------------------------------

             Summary: 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
            Assignee: Kenneth Knowles
            Priority: Minor


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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