Function codec_path_uses_sidecar

nodedb-vector/src/rerank/pipeline.rs:517–547

()

    /// Part F.1: codec path uses sidecar distances rather than FP32 fetch_vector.
    #[test]
    fn codec_path_uses_sidecar() {
        // StubCodec uses Binary name, so request VectorQuantization::Binary.
        let mut sc = make_sidecar(CodecName::Binary);
        // Insert 3 vectors: distances from [0,0] are 1.0, 2.0, 3.0.
        sc.encode_and_insert(1, &[1.0, 0.0]).unwrap();
        sc.encode_and_insert(2, &[0.0, 2.0]).unwrap();
        sc.encode_and_insert(3, &[3.0, 0.0]).unwrap();

        let candidates = vec![make(1), make(2), make(3)];
        let opts = opts_with_quant(VectorQuantization::Binary);

        // fetch_vector should never be called in codec path — pass a closure
        // that panics to confirm.
        let result = rerank(
            candidates,
            &[0.0, 0.0],
            DistanceMetric::L2,
            3,
            &opts,
            Some(&sc),
            |_id| panic!("fetch_vector must not be called in codec path"),
        )
        .unwrap();

        assert_eq!(result.len(), 3);
        // Distances: id=1 → 1.0, id=2 → 2.0, id=3 → 3.0
        assert_eq!(result[0].id, 1);
        assert_eq!(result[1].id, 2);
        assert_eq!(result[2].id, 3);
        assert!((result[0].distance - 1.0).abs() < 1e-5);
    }

    /// Part F.2: opts requests codec but sidecar is None → BadInput.
    #[test]