Zakelly opened a new pull request, #25918:
URL: https://github.com/apache/flink/pull/25918
## What is the purpose of the change
This PR enables the lazy-initialization for state serializer in state v2.
This is useful for datastream api, and is also a pre-work for exposing state v2
api to user.
## Brief change log
The code is very similar with those in state v1 descriptors.
- Implement constructor with `TypeInformation` for `StateDescriptor`s.
- Invoke `initializeSerializerUnlessSet` wherever necessary.
## Verifying this change
This change is already covered by existing tests
`StreamingRuntimeContextTest`.
## 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: yes
- The runtime per-record code paths (performance sensitive): no
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? not applicable
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