[jira] [Created] (FLINK-11949) Introduce DeclarativeAggregateFunction and AggsHandlerCodeGenerator to blink planner

[Shang Yuanchun (Jira)]

Jingsong Lee created FLINK-11949:
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             Summary: Introduce DeclarativeAggregateFunction and AggsHandlerCodeGenerator to blink planner
                 Key: FLINK-11949
                 URL: https://issues.apache.org/jira/browse/FLINK-11949
             Project: Flink
          Issue Type: New Feature
          Components: SQL / Planner
            Reporter: Jingsong Lee
            Assignee: Jingsong Lee


Introduce DeclarativeAggregateFunction: Use java Expressions to write a AggregateFunction, just like Table Api. Then the Table generates the corresponding CodeGenerator code according to the user's Expression logic. This avoids the Java object overhead in AggregateFunction before.

Introduce AggsHandlerCodeGenerator: According to multiple AggregateFunctions, generate a complete aggregation processing Class.



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