matriv opened a new pull request, #19426:
URL: https://github.com/apache/flink/pull/19426
## What is the purpose of the change
Throw early a validation error with workaround suggestion for
casting between numeric types and `TIMESTAMP`/`TIMESTAMP_LTZ` before
reaching the `CastRuleProvider`. This way we don't need to implement
such errors in Cast Rules and we can throw the error message early
before reaching the code generator.
## Brief change log
- Implement validation for from/to `CAST` pairs in `LogicalTypeCasts`
- Remove the Numeric <-> Timestamp/Timestamp_ltz rules which were added
only to throw this message
## Verifying this change
This change is already covered by existing tests, such as
`CastFunctionITCase`, `TemporalTypesTest`.
## 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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