godfreyhe opened a new pull request #11905:
URL: https://github.com/apache/flink/pull/11905
## What is the purpose of the change
*For TableEnvironment#explain() method, legacy batch planner throws
exception directly and legacy stream planner does not handle sink node. This pr
fixes them problems first. And then, this pr aim to supports the following
features: TableEnvironment#explainSql supports EXPLAIN statement; Introduce
TableEnvironment#explainSql api, Introduce Table#explain api*
## Brief change log
- *legacy stream planner supports explain insert operation*
- *legacy batch planner supports explain insert operation*
- *TableEnvironment#explainSql supports EXPLAIN statement*
- *Introduce TableEnvironment#explainSql api*
- *Introduce Table#explain api*
## Verifying this change
This change added tests and can be verified as follows:
- *Extended
TableEnvironmentTest/BatchTableEnvironmentTest/StreamTableEnvironmentTest to
verify the features*
## 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/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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