Au-Miner opened a new pull request, #28144:
URL: https://github.com/apache/flink/pull/28144
## What is the purpose of the change
Fix `TableEnvironment.toDataStream(..., clazz)` for POJOs that contain enum
fields. The change makes enum fields extractable and convertible when the table
side represents them as string values.
## Brief change log
- Update `DataTypeExtractor#extractDataTypeOrError` to recognize enum
classes via `extractEnumType`, and extend `CharType`/`VarCharType` conversion
checks so enum classes can be bridged to string logical types.
- Extend `DataStructureConverters#getConverterInternal` with enum handling
for `CHAR`/`VARCHAR` and add `StringEnumConverter` to convert between
`StringData` and enum values via `Enum.name()` / `Enum.valueOf()`.
## Verifying this change
Updated `DataTypeExtractorTest` to cover plain enums, enums with additional
fields, and POJOs containing enum fields, asserting that they are extracted as
`STRING` bridged to the enum class. Updated `DataStructureConvertersTest` to
verify round-trip conversion between `StringData` and enum values for string
logical types.
## 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, 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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