twalthr opened a new pull request #13007:
URL: https://github.com/apache/flink/pull/13007
## What is the purpose of the change
This updates imperative aggregate functions `AggregateFunction` and
`TableAggregateFunction` to the new type system with new type inference. The
new stack is activated when using
`TableEnvironment.createTemporarySystemFunction` or `call(Class, ...)` in Table
API. Other locations (SQL DDL, Table API Scala implicits) will be updated once
we support the concept of `DataView` as well. Currently, `DataView`s are not
supported.
## Brief change log
- Update the base classes `AggregateFunction` and `TableAggregateFunction`
- Enable them in `createTemporarySystemFunction`
- Update the entire stack from SQL/Table API until `AggregateUtil`
- Update some tests in different areas
## Verifying this change
This change is already covered by existing tests.
The following functions and their tests have been updated:
`CountNullNonNull, VarArgsAggFunction, Top3, WeightedAvgWithMergeAndReset`
## 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)`: yes
- The serializers: no
- The runtime per-record code paths (performance sensitive): no
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/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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