twalthr opened a new pull request #11153: [FLINK-15958][table-common] Introduce unresolved data types in API URL: https://github.com/apache/flink/pull/11153 ## What is the purpose of the change This introduces unresolved data types for class-based extraction, name-based resolution, and configuration-based RAW types. Unresolved types behave like regular data types but only after they have been resolved. Using unresolved data types in nested structures leads to further unresolved types. Thus, the usage of unresolved types is type-safe in API. ## Brief change log - Introduction of `AbstractDataType` as the highest type of resolved and unresolved data types - Introduction of `DataTypes.of()` for classes and names - Helper classes and methods for constructing unresolved types type-safe ## Verifying this change This change added tests and can be verified as follows: - `DataTypesTest` ## 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)`: yes - The serializers: no - The runtime per-record code paths (performance sensitive): no - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: no - The S3 file system connector: no ## Documentation - Does this pull request introduce a new feature? yes - If yes, how is the feature documented? JavaDocs
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