Stephan Ewen created FLINK-9392:
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Summary: Add @FunctionalInterface annotations to all core
functional interfaces
Key: FLINK-9392
URL: https://issues.apache.org/jira/browse/FLINK-9392
Project: Flink
Issue Type: Improvement
Components: Core
Reporter: Stephan Ewen
Assignee: Stephan Ewen
The {{@FunctionalInterface}} annotation should be added to all SAM interfaces
in order to prevent accidentally breaking them (as non SAMs).
We had a case of that before for the {{SinkFunction}} which was compatible
through default methods, but incompatible for users that previously
instantiated that interface through a lambda.
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