plusplusjiajia opened a new pull request, #500:
URL: https://github.com/apache/paimon-rust/pull/500
### Purpose
Deserialize Java's Jackson-serialized `Predicate` and `Transform` into Rust
types (`from_java_json` + field-index helpers), for the upcoming query-auth
enforcement (#498 follow-up) and the cross-language protocol direction.
- By-name field resolution, local types authoritative. Java semantics
mirrored at all three layers: wire layout (tests pin
`PredicateJsonSerdeTest`/`TransformJsonSerdeTest` strings verbatim),
constructor rules (`UPPER`/`LOWER` arity 1, `CONCAT_WS` ≥ 2, string-typed
inputs), and evaluator null semantics (null literal → `AlwaysFalse`, `In`
skips nulls, empty `NotIn` → `IS_NOT_NULL`).
- `CAST` validates local-source → target castability; anything unknown
errors, so authorization callers stay fail-closed.
- `DATE`/temporal literals rejected: Java's own deserializer cannot
round-trip them, no wire form to align with yet.
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