[GitHub] flink issue #4521: [FLINK-7357] [table] Created extended rules for WindowSta...

[fhueske]

Github user fhueske commented on the issue:

    https://github.com/apache/flink/pull/4521
  
    Thanks for the PR @walterddr. 
    
    We also need to replace group aux functions in the expressions of the 
filter predicate to support something like this:
    
    ```
    HAVING 
      SUM(a) > 0 AND
      QUARTER(HOP_START(ts, INTERVAL '15' MINUTE, INTERVAL '1' MINUTE)) = 1
    ```
    
    But that's just a minor change. 
    I'll fix that, extend the tests to cover the case, and do some refactorings 
before I merge this PR.
    
    Cheers, Fabian


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