jordepic opened a new pull request, #618:
URL: https://github.com/apache/paimon-rust/pull/618
### Purpose
Linked issue: close #616
`Storage::build` resolves the backing opendal operator through a closed
scheme match, so an embedding engine cannot supply its own operator (custom
service, metrics/caching layer, preconfigured client). Java Paimon exposes this
axis through the `FileIO` interface, the `FileIOLoader` SPI, and
`CatalogContext`'s `preferIO`/`fallbackIO`; this is the minimal Rust analog.
### Brief change log
- `FileIOBuilder::with_operator(op)` stores a prebuilt `opendal::Operator`;
when set, it takes precedence over scheme resolution in `build`.
- `Storage::Custom { op }` variant carries it through; `create()` reuses the
fs-relative path handling.
### Tests
- `cargo test -p paimon --lib io::` (85 tests) passes; the builder path is
exercised by the existing FileIO suites plus downstream use in StreamFusion,
which drives all its state-table IO through an operator injected here.
### API and Format
Additive API on `FileIOBuilder`; no storage-format change.
### Documentation
Doc comments on the new builder method.
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