twalthr opened a new pull request #18858:
URL: https://github.com/apache/flink/pull/18858
## What is the purpose of the change
Currently, there is still a lot of Java serialization and unresolved TODOs
in serializers. This PR hardens the serialization of `RexNode` and esp.
function calls. It supports all kinds of functions and modules.
- Anonymous functions are serialized on a best-effort basis.
- Temporary functions are never serialized.
- Permanent functions are versioned (for built-in functions) and serialized
if possible.
## Brief change log
- Adhere to FLIP-190
- Remove Java serialization
- Support function versioning
- Support temporary and module functions
## Verifying this change
This change added tests and can be verified as follows: `RexNodeSerdeTest`
## 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, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? JavaDocs
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