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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