manner opened a new pull request, #29154:
URL: https://github.com/apache/flink/pull/29154
## What is the purpose of the change
This pull request adds two new built-in SQL scalar functions, `UUID_V4()`
and `UUID_V7()`, generating RFC 9562 UUID values — a random version 4 UUID and
a time-ordered version 7 UUID.
## Brief change log
- Added `BuiltInFunctionDefinitions.UUID_V4` / `UUID_V7`
- Added `UuidGenerationUtils` with `generateV4()`/`generateV7()`,
producing the 16-byte internal representation of a `UUID` value directly (no
round-trip through `java.util.UUID`)
- Added `UuidV4Function` / `UuidV7Function` runtime classes
- Added `uuidV4()` / `uuidV7()` to the Java and Scala Table API expression
DSL
- Documented both functions in `sql_functions.yml` (English and Chinese)
## Verifying this change
This change added tests and can be verified as follows:
- Added `UuidGenerationUtilsTest`, directly asserting on the generated
bytes: correct length, version nibble, variant bits, and (for v7) that the
embedded timestamp matches `System.currentTimeMillis()` at call time
- Added `UuidFunctionsITCase`, covering the SQL and Table API return type
(`UUID`) and the version nibble in the canonical string form, executed
end-to-end against a MiniCluster
## 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** — `Expressions.java` (`@PublicEvolving`) gains two
new additive methods, `uuidV4()` and `uuidV7()`
- The serializers: **no**
- The runtime per-record code paths (performance sensitive): yes — only
exercised when a query explicitly calls `UUID_V4()`/`UUID_V7()`
- 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** (`sql_functions.yml`)
and JavaDocs
---
##### Was generative AI tooling used to co-author this PR?
- [X] Yes (please specify the tool below)
Generated-by: Claude Code (Sonnet 5)
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