JingsongLi opened a new pull request #8001: [FLINK-11949][table-planner-blink] Introduce DeclarativeAggregateFunction and AggsHandlerCodeGenerator to blink planner URL: https://github.com/apache/flink/pull/8001 ## What is the purpose of the change 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. ## Brief change log Add DeclarativeAggregateFunction Add AggCodeGen Add UserDefinedFunctionUtils Add Expression utils ## Verifying this change *(Please pick either of the following options)* ut ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (no) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (no) - The serializers: (no) - The runtime per-record code paths (performance sensitive): (no) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no) - The S3 file system connector: (no) ## Documentation - Does this pull request introduce a new feature? (yes) - If yes, how is the feature documented? (JavaDocs)
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