manner opened a new pull request, #29103:
URL: https://github.com/apache/flink/pull/29103
## What is the purpose of the change
Adds UUID (primitive type code 20) as a supported VARIANT primitive in
`BinaryVariant`.
The 16-byte layout follows the open variant spec, which stores UUID
big-endian. UUID is the only variant primitive that is not little-endian, so it
uses dedicated big-endian read/write helpers.
## Brief change log
- Add the UUID primitive (code 20) to `BinaryVariantUtil`: type mapping in
`getType`, a `case UUID` in `valueSize`, and the `getUUID` reader
- Add big-endian long helpers `writeLongBigEndian` / `readLongBigEndian`;
a UUID is stored as its two 64-bit halves in 16 big-endian bytes
- Add `appendUUID` to `BinaryVariantInternalBuilder` and `of(UUID)` to
`BinaryVariantBuilder`
- Add `getUUID()` and `Type.UUID` to the `Variant` interface and
`of(UUID)` to `VariantBuilder`, and wire UUID into `get()` and `toJson()`
## Verifying this change
This change added tests and can be verified as follows:
- Added scalar round-trip and `toJson` assertions for UUID variants
- Added `testUuidDecodeFromSpecBytes`, which decodes the exact byte
sequence from Iceberg's `TestSerializedPrimitives#testUUID` to confirm the wire
format is compatible across implementations of the spec
## 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** (`Variant` and `VariantBuilder` are
`@PublicEvolving`, this adds new enum constants and new interface methods)
- 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? **not documented** (documentation
is tracked separately in
[FLINK-40494](https://issues.apache.org/jira/browse/FLINK-40494))
---
##### Was generative AI tooling used to co-author this PR?
- [X] Yes (please specify the tool below)
Generated-by: Claude Code (Claude Opus 4.8)
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