VasShabu opened a new pull request, #28688:
URL: https://github.com/apache/flink/pull/28688
## What is the purpose of the change
This pull request adds support for the built-in SQL function `JSON_LENGTH`,
which returns the number of top-level elements in a JSON array or object.
Scalars have a length of 1, and `NULL` input returns `NULL`. Nested arrays or
objects are not counted recursively.
## Brief change log
- Added `JsonLengthFunction` implementing the `JSON_LENGTH` built-in
function
- Registered `JSON_LENGTH` as a built-in function in the function catalog
- Added test cases for `JSON_LENGTH` in `JsonFunctionsITCase`
## 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).
This change added tests and can be verified as follows:
- `mvn test -pl flink-table/flink-table-runtime -Dtest=JsonFunctionsITCase`
- Added test cases for `JSON_LENGTH` covering scalars, arrays, objects,
and `NULL` input in `JsonFunctionsITCase`
## 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? docs (sql_functions.yml)
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##### Was generative AI tooling used to co-author this PR?
- [X] Yes (Claude)
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