[jira] [Created] (FLINK-5767) Add a new aggregate function interface

[Shang Yuanchun (Jira)]

Shaoxuan Wang created FLINK-5767:
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             Summary: Add a new aggregate function interface
                 Key: FLINK-5767
                 URL: https://issues.apache.org/jira/browse/FLINK-5767
             Project: Flink
          Issue Type: Sub-task
          Components: Table API & SQL
            Reporter: Shaoxuan Wang
            Assignee: Shaoxuan Wang


Add a new aggregate function interface. This includes implementing the aggregate interface, migrating the existing aggregation functions to this interface, and adding the unit tests for these functions.



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