liuml07 opened a new pull request, #21535:
URL: https://github.com/apache/flink/pull/21535
## What is the purpose of the change
Currently the SET command in SQL client has two syntax:
- `SET;` for listing all config properties
- `SET 'key'='value'` for setting a property with (new) value
As in Spark SQL and Flink SQL with Hive dialect, it would be convenient to
show one config property using the syntax `SET 'key';`. Without this, users
will need to find the very one config from all config properties.
## Brief change log
- Add syntax to the parser and converters
- Add unit tests and integration tests
- Update user doc
## Verifying this change
This change added tests and can be verified as follows:
- *Extended existing unit test and integration test*
- *Manually verified the change by running a local Flink cluster*
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / **no**)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / **no** / don't
know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / **no**)
- If yes, how is the feature documented? (not applicable / **docs** /
JavaDocs / not documented)
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