[GitHub] [flink] twalthr opened a new pull request #8661: [FLINK-12711][table] Separate function implementation and definition

[GitBox <gi...@apache.org>]

twalthr opened a new pull request #8661:  [FLINK-12711][table] Separate function implementation and definition
URL: https://github.com/apache/flink/pull/8661
 
 
   ## What is the purpose of the change
   
   This PR is a first step toward unified expression stacks. It uncouples runtime implementation from information that is needed during validation and planning.
   
   With this change it is possible to declare properties such as `isDeterminstic` or `requiresOver` also for built-in functions. A next step is to add a `getTypeInference` method to `FunctionDefinition` which enables the removal of all `PlannerExpression` by using `BuiltInFunctionDefinition` instead.
   
   ## Brief change log
   
   See commit messages.
   
   ## Verifying this change
   
   This change is already covered by existing tests.
   
   ## 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? no
     - If yes, how is the feature documented? JavaDocs
   

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