twalthr opened a new pull request, #19543:
URL: https://github.com/apache/flink/pull/19543
## What is the purpose of the change
This enables to evaluate arbitrary expressions in `SpecializedFunction`. It
allows to access all built-in functions including code generated ones during
runtime. It enables writing UDFs in pure Java code without adjusting the code
generation at various locations. As a proof-of-concept and reference
implementation this PR also adds the `ARRAY_CONTAINS` function to both Table
API and SQL.
## Brief change log
- Various refactorings around context instances
- New APIs for `SpecializedFunction`
- ARRAY_CONTAINS for Table API and SQL
## Verifying this change
This change added tests and can be verified as follows: `FunctionITCase`,
`CollectionFunctionsITCase`
## 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, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? yes
- If yes, how is the feature documented? docs
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