Aaaaaaron opened a new pull request #13836:
URL: https://github.com/apache/flink/pull/13836
## What is the purpose of the change
SqlDataTypeSpec#getNullable may return null(by Calcite design, it returns
"Boolean" instead "boolean"), so the caller should handle null itself. In
Calcite, every place calls this method adds the null judge.
Below is the code from Calcite.
**org.apache.calcite.sql.SqlDataTypeSpec**
```
/** Whether data type allows nulls.
*
* <p>Nullable is nullable! Null means "not specified". E.g.
* {@code CAST(x AS INTEGER)} preserves the same nullability as {@code x}.
*/
private Boolean nullable;
```
## Brief change log
Handle "null" when calling SqlDataTypeSpec#getNullable.
## Verifying this change
This change is a trivial rework / code cleanup without any test coverage.
## 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)`: (no)
- 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/Mesos, ZooKeeper: (no)
- The S3 file system connector: (no)
## Documentation
- Does this pull request introduce a new feature? (no)
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