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https://issues.apache.org/jira/browse/FLINK-9538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16502923#comment-16502923
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Aljoscha Krettek commented on FLINK-9538:
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Sounds good!
> Make KeyedStateFunction an interface
> ------------------------------------
>
> Key: FLINK-9538
> URL: https://issues.apache.org/jira/browse/FLINK-9538
> Project: Flink
> Issue Type: Improvement
> Reporter: Dawid Wysakowicz
> Priority: Major
>
> I suggest to change the KeyedStateFunction from abstract class to interface
> (FunctionalInterface in particular) to enable passing lambdas.
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