QuakeWang opened a new pull request, #719:
URL: https://github.com/apache/paimon-rust/pull/719
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### Purpose
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Linked issue: #34
The existing Rust FileIndex implementation used a Rust-only wire format that
differed from Java Paimon V1 in byte order, version, string encoding, and
integer widths. This prevented Java and Rust from exchanging FileIndex files
reliably. The reader also assumed a fixed-size header and did not fully
validate encoded ranges.
<!-- What is the purpose of the change -->
### Brief change log
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they address the issue -->
- Align FileIndex reading and writing with Java V1.
- Preserve absent and empty index payloads separately.
- Validate truncated headers, invalid offsets, lengths, and overflows.
- Support headers larger than 1 MiB.
- Add Java golden fixtures and boundary tests.
### Tests
<!-- List unit tests or integration cases to verify this change -->
- `cargo fmt --all -- --check`
- `cargo clippy --locked --all-targets --workspace --features
fulltext,vortex -- -D warnings`
- `cargo test --locked -p paimon --all-targets --features fulltext,vortex`
- `cargo test --locked -p paimon-rest-server --all-targets`
- Rust 1.91 workspace MSRV check
- Java/Rust V1 interoperability verification
### API and Format
<!-- Does this change affect API or storage format -->
FileIndex payload APIs now use `Option<Bytes>` to distinguish absent indexes
from empty payloads. The wire format is changed to Java-compatible V1. The
legacy Rust-only format is intentionally unsupported.
### Documentation
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updates -->
Updated inline format documentation.
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