QuakeWang opened a new pull request, #521:
URL: https://github.com/apache/paimon-rust/pull/521
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### Purpose
<!-- Linking this pull request to the issue -->
`BlobDescriptor.length == -1` means reading from `offset` to EOF. The
dedicated BLOB writer cast this value to `u64`, while the
`blob-descriptor-field` resolver rejected it as negative, causing inconsistent
behavior across table configurations.
<!-- What is the purpose of the change -->
### Brief change log
<!-- Please describe the changes made in this pull request and explain how
they address the issue -->
- Centralize BlobDescriptor range validation and unknown-length handling.
- Resolve `length == -1` in both dedicated BLOB writes and inline
descriptor reads.
- Reject invalid ranges and short reads instead of producing inconsistent
blob data.
- Add end-to-end coverage for both paths.
### Tests
<!-- List unit tests or integration cases to verify this change -->
- `cargo test -p paimon --all-targets --features fulltext,vortex`
- `cargo test -p paimon-datafusion --test blob_tests`
### API and Format
<!-- Does this change affect API or storage format -->
No API or storage format change. This implements the existing BlobDescriptor
protocol semantics.
### Documentation
<!-- Does this change introduce a new feature or require documentation
updates -->
Documented the `length == -1` behavior and range constraints.
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