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I hereby agree to the terms of the [GreptimeDB CLA](https://github.com/GreptimeTeam/.github/blob/main/CLA.md). ## Refer to a related PR or issue link (optional) No dependencies on other open PRs. ## What's changed and what's your intention? Add two default methods to `RegionScanner` for raw-series scan preflight: - `raw_series_schema()` — non-consuming check whether this scanner can provide raw series for a given label source. Returns `None` (unsupported) by default; overrides promise `scan_series_partition` can execute. - `raw_series_ordering()` — returns the ordering guarantee without consuming scanner state. Defaults to `Contiguous` (conservative for legacy sources). Both are additive-only trait defaults with no behavior change for existing implementors. **32 insertions, 0 deletions, 1 file.** ### Verification - `cargo check --locked -p store-api --all-targets` ✅ - `cargo nextest run --locked -p store-api --retries 0` ✅ - `cargo clippy --locked -p store-api --all-targets -- -D warnings` ✅ ## PR Checklist - [x] I have written the necessary rustdoc comments. - [x] I have added the necessary unit tests and integration tests. - [ ] This PR requires documentation updates. - [x] API changes are backward compatible. - [x] Schema or data changes are backward compatible. - [ ] This PR needs to be backported to release branches, and I have added the `backport-<target>` labels (e.g. `backport-v1.3` targets `release/v1.3`).