affo opened a new pull request, #26438:
URL: https://github.com/apache/flink/pull/26438
…LECT clause
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## What is the purpose of the change
This PR adds star expansion in SQL in order to gracefully handle statements
like `SELECT myUDF(*) from MyTable`.
## Brief change log
- Add a private visitor to perform star expansion of calls to
`SqlValidatorImpl` that re-uses the pre-existing `expandStar` method in the
validator itself
- Add a step in-between unconditional rewrites and validation to expand
star (unconditional rewrites would be too early to have information about
scopes and perform the expansion, after validation would be too late as the
type of `*` cannot be derived
- Add tests for both parsing and validating
As of now, I did not update the class Javadoc with the lines of the update
as I don't know if this is the best way to achieve the result. Waiting for a
review to fix the Javadoc in case.
## Verifying this change
This change added tests and can be verified as follows:
- Tests for parsing to make sure `foo(*)` can be parsed as a valid function
call
- Tests in validation to verify that the expansion is performed correctly
and only under `SELECT`
- I have local tests for running a full program and check the final result,
but don't know if needed
## 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? NA
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