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https://issues.apache.org/jira/browse/FLINK-2194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14596535#comment-14596535
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ASF GitHub Bot commented on FLINK-2194:
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Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/814#issuecomment-114236910
Moreover, it would be inconsistent IMO with the rest of the typing system.
Sometimes interfaces are supported and sometimes not. For the user, this might
be confusing since it's nowhere documented, as far as I know.
> Type extractor does not support Writable type
> ---------------------------------------------
>
> Key: FLINK-2194
> URL: https://issues.apache.org/jira/browse/FLINK-2194
> Project: Flink
> Issue Type: Bug
> Reporter: Till Rohrmann
> Assignee: Till Rohrmann
>
> The type extractor supports sub types of {{Writable}} but not {{Writable}}
> itself. The reason is that it wants to create a {{WritableTypeInfo}} which is
> not possible for the interface {{Writable}}, though. A solution would be to
> treat the {{Writable}} interface like a generic type.
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