shyjsarah opened a new pull request, #70:
URL: https://github.com/apache/paimon-vector-index/pull/70
## Summary
Add an append-only C search-parameter structure so future query tuning
fields can be exposed without adding a new by-value ABI version for every field.
This also exposes `max_initial_filter_expansion_factor` to C and C++ while
preserving the existing V1/V2 symbols and behavior.
## Changes
- Add pointer-based `PaimonVindexSearchParamsEx` with a caller-provided
`struct_size`.
- Missing fields from shorter caller structs use existing defaults.
- Unknown trailing fields from newer caller structs are ignored.
- Add `*_ex` variants for single, filtered, batch, and filtered-batch C
searches.
- Keep all existing by-value C search functions unchanged for binary
compatibility.
- Route the C++ RAII reader through the extensible API and expose:
- `max_initial_filter_expansion_factor`
- IVF-PQ batch table reuse mode
- IVF-PQ batch table reuse memory budget
- Document the append-only ABI contract and C/C++ usage.
## Testing
- `cargo fmt --all -- --check`
- `cargo clippy --all-targets --workspace --locked -- -D warnings`
- `cargo test --workspace --locked`
- C FFI roundtrip tests, including a shorter prefix struct passed to the new
API
- C++ roundtrip tests and query tuning parameter forwarding
- `git diff --check`
## Notes
- Public API: additive.
- Existing C ABI symbols and by-value parameter structures are unchanged.
- New callers should initialize `struct_size` with
`sizeof(PaimonVindexSearchParamsEx)`.
- Follow-up to the query tuning added in #67 and #68.
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