twalthr opened a new pull request #14378:
URL: https://github.com/apache/flink/pull/14378
## What is the purpose of the change
This PR completes the envisioned design of FLIP-32 and FLIP-65. It makes
implementing built-in
functions as easy as implementing user-defined functions while keeping
function definition and body (aka runtime
implementation) separately.
It introduces the concept of `SpecializedFunctions` to hook into the
planning phase for generating
runtime implementation lazily.
For proving the concepts, the PR implements two frequently requested
functions: `TYPEOF()` and `IFNULL()`
## Brief change log
See commit messages.
## Verifying this change
This change added tests and can be verified as follows:
- `FunctionITCase`
- `MiscFunctionsITCase`
## 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
- If yes, how is the feature documented? docs
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