[jira] [Created] (FLINK-11520) Triggers should be provided the window state

[Shang Yuanchun (Jira)]

Elias Levy created FLINK-11520:
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             Summary: Triggers should be provided the window state
                 Key: FLINK-11520
                 URL: https://issues.apache.org/jira/browse/FLINK-11520
             Project: Flink
          Issue Type: Improvement
            Reporter: Elias Levy


Some triggers may require access to the window state to perform their job.  Consider a window computing a count using an aggregate function.  It may be desired to fire the window when the count is 1 and then at the end of the window.  The early firing can provide feedback to external systems that a key has been observed, while waiting for the final count.

The same problem can be observed in org.apache.flink.streaming.api.windowing.triggers.CountTrigger, which must maintain an internal count instead of being able to make use of the window state.



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