twalthr opened a new pull request #18464:
URL: https://github.com/apache/flink/pull/18464
## What is the purpose of the change
This adds a basic but sufficient mechanism for function versioning. It adds
the concept of internal functions to the stack. Internal functions are fully
qualified by name and version. They are not exposed to the user and can thus
kept around for a longer period of time. The most recent version of a function
is stored in `BuiltInFunctionDefinition` and a new `BuiltInSqlFunction`.
## Brief change log
- Add a flag for internal functions to `BuiltInFunctionDefinition`
- Introduce `BuiltInSqlFunction` and `BuiltInSqlOperator` for easier
long-term handling of Calcite functions.
- Adapt some functions in `FlinkSqlOperatorTable` to show the idea and a
couple of reference implementations
- Update the first internal function `$REPLICATE_ROWS$1`.
## Verifying this change
This change is already covered by existing tests, such as `CoreModuleTest`.
## 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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