[jira] [Created] (FLINK-21881) Support local global optimization for window aggregation

[Shang Yuanchun (Jira)]

Jark Wu created FLINK-21881:
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             Summary: Support local global optimization for window aggregation
                 Key: FLINK-21881
                 URL: https://issues.apache.org/jira/browse/FLINK-21881
             Project: Flink
          Issue Type: Sub-task
          Components: Table SQL / Planner
            Reporter: Jark Wu






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