PatrickRen opened a new pull request #14784:
URL: https://github.com/apache/flink/pull/14784
## What is the purpose of the change
This pull request fixes bug of referencing uninitialized deserializer in
```ValueDeserializerWrapper``` when using
```KafkaRecordDeserializer#valueOnly```, which would lead to NPE at job
compiling stage.
## Brief change log
- Keep the ```deserializeClass``` directly in the instance of
```ValueDeserializerWrapper``` as a member instead of storing the name of the
class
- Add an IT case for testing value only deserializer.
## Verifying this change
- *Added integration tests for using
```KafkaRecordDeserializer#valueOnly``` to build a KafkaSource*
## 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? (no)
- If yes, how is the feature documented? (not applicable)
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