twalthr opened a new pull request #11904:
URL: https://github.com/apache/flink/pull/11904
## What is the purpose of the change
Enables support for untyped NULL literals in function calls. The null type
remains a helper type. We don't expose this type through the DDL or allow it as
a function return type. It will not be used during runtime for serialization.
The PR might not cover all cases, entry points of NULL into the type factory
should be avoided.
## Brief change log
- Don't allow a NULL type during type generalization
- Generate a null literal for FLIP-65 functions
## Verifying this change
This change added tests and can be verified as follows: `FunctionITCase`,
`NullTypeTest`
## 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)`: yes
- 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? (yes / no)
- If yes, how is the feature documented? (not applicable / docs / JavaDocs
/ not documented)
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