beyond1920 opened a new pull request #15291:
URL: https://github.com/apache/flink/pull/15291
## What is the purpose of the change
This pull request aims to implement streaming window topN operator.
## Brief change log
- Introduce `CombineRecordsFunction` in rank/window/combines package to
get TopN data of incremental inputs
- move `WindowCombineFunction` from aggregate/window/combines/ to
window/combines in order to be inherited by new introduced
`CombineRecordsFunction`
- Introduce `WindowRankProcessor` which inherits `SlicingWindowProcessor`
to processes elements for WindowRank.
- Introduce `WindowRankOperatorBuilder` to build 'WindowRankOperator'
which is exactly a `SlicingWindowOperator` based on `WindowRankProcessor`
- Introduce `WindowMapState` which is a wrapper of `MapState` to make it
easier to update based on window namespace
- Introduce `StreamExecWindowRank` which is a stream `ExecNode` for
WindowRank
## Verifying this change
- Add more plan test for invalid query in existed `WindowRankTest`
- Add ITCase(`WindowRankITCase`) to test WindowRank
- Add harness test (`WindowRankOperatorTest`) to test WindowRankOperator
## 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, 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? (not documented)
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