[jira] [Created] (FLINK-9538) Make KeyedStateFunction an interface

[Shang Yuanchun (Jira)]

Dawid Wysakowicz created FLINK-9538:
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             Summary: Make KeyedStateFunction an interface
                 Key: FLINK-9538
                 URL: https://issues.apache.org/jira/browse/FLINK-9538
             Project: Flink
          Issue Type: Improvement
            Reporter: Dawid Wysakowicz


I propose to change the KeyedStateFunction from abstract class to interface (FunctionalInterface in particular) to enable passing lambdas.



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