[jira] [Created] (FLINK-4307) Broken user-facing API for ListState

[Shang Yuanchun (Jira)]

Stephan Ewen created FLINK-4307:
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             Summary: Broken user-facing API for ListState
                 Key: FLINK-4307
                 URL: https://issues.apache.org/jira/browse/FLINK-4307
             Project: Flink
          Issue Type: Bug
          Components: Streaming
            Reporter: Stephan Ewen
            Assignee: Stephan Ewen
            Priority: Blocker
             Fix For: 1.1.0


The user-facing {{ListState}} is supposed to return an empty list when no element is contained in the state.

A previous change altered that behavior to make it in the runtime classes accessible whether a ListState is empty.

To not break the user-facing API, we need to restore the behavior for ListState exposed to the users via the {{RuntimeContext}}.



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