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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