X-czh opened a new pull request, #24845:
URL: https://github.com/apache/flink/pull/24845
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## What is the purpose of the change
Introduce built-in serialization support for sets, which falls back to Kyro
previously.
## Brief change log
Introduce dedicated serializer and de-serializer for sets and add built-in
serialization support for sets when extracting types.
## Verifying this change
This change added tests that validate:
- sets are correctly serialized and de-serialized with the new dedicated
serializer and de-serializer.
- sets are serialized using the built-in serializer instead of Kyro.
Since serializer upgrade test requires at least one previous release to test
the upgrade of set serializers (which does not exist yet), I'll postpone adding
the upgrade test for set serializer after the release of v1.20.
## 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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