docete opened a new pull request #11892:
URL: https://github.com/apache/flink/pull/11892
## What is the purpose of the change
FLINK-14688 introduces DESCRIBE statement in sql parser, but doesn't
implement it in planner side because the TableEnvironment.sqlUpdate returns
nothing. Since FLINK-16366 introduces TableEnvironment.executeSql and returns
TableResult, we can implement DESCRIBE statement in planner now.
## Brief change log
- 84b4681 supports DESCRIBE statement in both planners
## Verifying this change
This change added tests
## 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, Yarn/Mesos, 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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