[PR] vindex: use automatic IVF search width by default [paimon-rust]

["shyjsarah (via GitHub)" <gi...@apache.org>]

shyjsarah opened a new pull request, #840:
URL: https://github.com/apache/paimon-rust/pull/840

   ## Summary
   
   Align Rust IVF search with Java by using the native automatic search width when `ivf.nprobe` is omitted. This lets filtered IVF searches progressively expand when the initial width underfills the requested top-k.
   
   ## Changes
   
   - Use `VectorSearchParams::automatic(top_k)` for IVF searches without an explicit `ivf.nprobe`.
   - Preserve explicit integer `ivf.nprobe` values as fixed-width `IvfNProbe` searches, including existing invalid-value validation.
   - Report `nprobe=auto` in vector-search diagnostics when automatic selection is active.
   - Document the automatic default and IVF progressive-expansion behavior.
   - Add a regression test covering both omitted and explicit `ivf.nprobe` branches.
   
   ## Public API impact
   
   No Rust API signatures change. Runtime behavior changes when an IVF query omits `ivf.nprobe`: search width is now selected automatically instead of defaulting to 16, which can change approximate result ordering, recall, and search cost. Explicit `ivf.nprobe` retains the previous fixed-width behavior.
   
   ## Testing
   
   - [x] RED on `apache/main`: `cargo test -p paimon prepare_ivf_search_uses_automatic_or_explicit_nprobe --lib -- --nocapture` failed as expected (`IvfNProbe` versus `Auto`).
   - [x] GREEN on this branch: the same command passed (`1 passed, 0 failed`).
   - [x] Full `paimon` library suite passed (`2794 passed, 0 failed, 2 ignored`).
   - [x] `cargo check -p paimon`
   - [x] `cargo fmt --check`
   - [x] `cargo clippy -p paimon --lib --no-deps -- -D warnings`
   
   ## Notes
   
   Full-workspace `cargo check` and Clippy were blocked locally because the available Python 3.9 interpreter does not satisfy the Python binding's `abi3-py310` requirement. The changed `paimon` crate checks passed. No issue link is available.
   


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Re: [PR] vindex: use automatic IVF search width by default [paimon-rust]

["jerry-024 (via GitHub)" <gi...@apache.org>]

jerry-024 merged PR #840:
URL: https://github.com/apache/paimon-rust/pull/840


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