mrdrivingduck opened a new pull request, #425:
URL: https://github.com/apache/paimon-cpp/pull/425
### Purpose
Expose `Catalog::GetLatestSnapshot()` so catalog clients can retrieve the
latest snapshot metadata, including its snapshot ID and schema ID, without
loading the full snapshot history or planning a scan.
The filesystem implementation reuses `SnapshotManager::LatestSnapshot()`,
including its existing latest-snapshot hint and filename-listing fallback. The
REST implementation uses the existing current-snapshot endpoint. Neither
implementation calls `ListSnapshots()`. Tables without snapshots return an
empty optional; branch selection and missing-table behavior follow the existing
behavior of each catalog.
### Tests
A clean Debug build of `paimon-core-test` and `paimon-rest-test` passed with
REST enabled, bundled dependencies, and ccache disabled.
- All 4 new tests passed: latest snapshot metadata, no snapshot, branch
selection, and missing objects. Filesystem tests reuse checked-in fixtures;
REST tests reuse the existing mock server.
- All 96 related regression tests passed: filesystem catalog, REST catalog,
snapshot manager, and snapshot metadata conversion.
- Pre-commit checks passed for all 8 changed files; the diff whitespace
check passed.
Test filters:
```text
FileSystemCatalogTest.TestGetLatestSnapshot*
RestCatalogTest.GetLatestSnapshot*
FileSystemCatalogTest.*:SnapshotManagerTest.*:SnapshotTest.TestToSnapshotInfo-FileSystemCatalogTest.TestGetLatestSnapshot*
RestCatalogTest.*-RestCatalogTest.GetLatestSnapshot*
```
The full project test suite was not run.
### API and Format
Add a pure virtual method to the public catalog API:
```cpp
virtual Result<std::optional<SnapshotInfo>> GetLatestSnapshot(
const Identifier& identifier, const std::string& branch = "") const = 0;
```
Filesystem, REST, and mock catalog implementations are updated. Other
catalog subclasses must provide an override. Storage formats and REST protocol
are unchanged.
### Documentation
The public API is documented inline in the catalog header. No separate
documentation or README changes are included.
### Generative AI tooling
Generated-by: OpenAI Codex (GPT-6.1 Sol).
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