[jira] [Created] (FLINK-12559) Introduce metadata handlers on window aggregate

[Shang Yuanchun (Jira)]

godfrey he created FLINK-12559:
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             Summary: Introduce metadata handlers on window aggregate
                 Key: FLINK-12559
                 URL: https://issues.apache.org/jira/browse/FLINK-12559
             Project: Flink
          Issue Type: New Feature
          Components: Table SQL / Planner
            Reporter: godfrey he
            Assignee: godfrey he


In [FLINK-11822|https://issues.apache.org/jira/browse/FLINK-11822], we have introduced all Flink metadata handlers,  several {{RelNode}}s (e.g. window aggregate) have not be implemented. So this issue aims to introduce metadata handlers on window aggregate.



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