dawidwys opened a new pull request #12649:
URL: https://github.com/apache/flink/pull/12649
## What is the purpose of the change
This PR implements type inference for GET/FLATTEN expressions. Additionally
it aligns the behaviour between Table API & SQL. To achieve that it fixes
handling nullability of nested columns in operators such as DOT, ITEM and
nested fields coming directly from a Table.
## Verifying this change
Added tests in
* `InputTypeStrategiesTest` for `COMPOSITE` strategy
* `TypeStrategiesTest` for `GET` strategy
* `CompositeTypeAccessExpressionITCase` IT tests for accessing nested fields
in both SQL & Table API
## 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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