BIOINSu opened a new pull request, #24128:
URL: https://github.com/apache/flink/pull/24128
## What is the purpose of the change
Implement `ParallelismProvider` for sources in the table planner to support
setting parallelism for Table/SQL sources.
## Brief change log
- `CommonExecTableSourceScan` would get parallelism from
`ParallelismProvider` if possible and configure the source parallelism into
source transformation after validation
- Introduce `SourceTransformationWrapper` to wrap the source transformation
and expose a default parallelism to downstream
- Use real source transformation when generate stream graph
## Verifying this change
This change added tests and can be verified as follows:
- Add end-to-end integration tests for setting source parallelism using
table api
- Add new field `@Nullable` parallelism in
`TestValuesScanTableSourceWithoutProjectionPushDown` for the test related to
ParallelismProvider in source
- Test `SourceFunctionProvider`, `InputFormatProvider` and
`DataStreamScanProvider` working with `ParallelismProvider`
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (**yes** / no)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / **no** / don't
know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (**yes** / no)
- If yes, how is the feature documented? (not applicable / **docs** /
JavaDocs / not documented)
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