twalthr opened a new pull request, #25707:
URL: https://github.com/apache/flink/pull/25707

   ## What is the purpose of the change
   
   Adds the initial interfaces of `ProcessTableFunction` and `StateHint` 
mentioned in FLIP-440 to the code base. This is a requirement to continue with 
the `TypeInferenceExtractor` extractor work. 
   
   ## Brief change log
   
   - Introduce `ProcessTableFunction` and `StateHint`
   - Add `FunctionHint.state()`
   - Add `TableSementics` for powering the context of PTFs
   
   ## Verifying this change
   
   Please make sure both new and modified tests in this PR follow [the 
conventions for tests defined in our code quality 
guide](https://flink.apache.org/how-to-contribute/code-style-and-quality-common/#7-testing).
   
   *(Please pick either of the following options)*
   
   This change is a trivial rework / code cleanup without any test coverage.
   
   *(or)*
   
   This change is already covered by existing tests, such as *(please describe 
tests)*.
   
   *(or)*
   
   This change added tests and can be verified as follows:
   
   *(example:)*
     - *Added integration tests for end-to-end deployment with large payloads 
(100MB)*
     - *Extended integration test for recovery after master (JobManager) 
failure*
     - *Added test that validates that TaskInfo is transferred only once across 
recoveries*
     - *Manually verified the change by running a 4 node cluster with 2 
JobManagers and 4 TaskManagers, a stateful streaming program, and killing one 
JobManager and two TaskManagers during the execution, verifying that recovery 
happens correctly.*
   
   ## 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, Kubernetes/Yarn, 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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