Airblader opened a new pull request #16805:
URL: https://github.com/apache/flink/pull/16805
## What is the purpose of the change
This PR introduces support for the `IS JSON` predicate for Table API.
Instead of exposing eight methods for all combinations, we expose only two
methods: one without any arguments (= `IS JSON`), and one method which takes a
type constraint (= `IS JSON [VALUE | SCALAR | ARRAY | OBJECT]`). Negations (`IS
NOT JSON …`) can be done through the `NOT` operator since `IS JSON` always
returns non-nullable boolean. However, `NOT` was only exposed for the Scala
Table API, so this PR also exposes it for Java.
## Verifying this change
This change added tests and can be verified as follows:
* `LogicalFunctionsITCase`
## 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 / JavaDocs
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