[PR] Optimize IVF-RQ search hot paths [paimon-vector-index]

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

JingsongLi opened a new pull request, #57:
URL: https://github.com/apache/paimon-vector-index/pull/57

   ## Summary
   
   Optimizes IVF-RQ search hot paths without changing public APIs or the on-disk index format.
   
   ## Changes
   
   - Build the `query_bits=0` byte LUT incrementally.
   - Replace linear Top-K worst-result scans with an indexed max heap.
   - Partially select IVF coarse centroids and sort only the `nprobe` prefix.
   - Batch RQ reader multi-range reads with a 16 MiB payload bound.
   
   ## Performance
   
   ANN benchmark (`N=10,000`, `NQ=1,000`, `D=128`, `nlist=64`, `nprobe=8`, `k=10`, `query_bits=0`):
   
   - Search latency: 130 ms -> 86 ms
   - Throughput: 7,673 -> 11,627 QPS (~1.5x)
   
   ## Testing
   
   - `cargo test --workspace`
   - `cargo clippy --workspace --all-targets -- -D warnings`
   - `cargo fmt --check`
   - `cargo bench -p paimon-vindex-core --bench ann_bench -- --nocapture`
   
   ## Notes
   
   No breaking changes or storage-format migration required.


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Re: [PR] Optimize IVF-RQ search hot paths [paimon-vector-index]

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

JingsongLi merged PR #57:
URL: https://github.com/apache/paimon-vector-index/pull/57


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