Method prepare_query

nodedb-vector/src/quantize/pq_codec.rs:91–100

Prepare the query by precomputing the M×K asymmetric distance table. The `VectorCodec` trait does not propagate errors. A `PqCodec` used via this trait path is created by `PqCodec::train` which sets no governor; `build_distance_table` therefore always returns `Ok` here. If a governor is attached and its budget is exhausted the caller that constructed the codec is responsible for handling the err

(&self, q: &[f32])

    /// panics with a descriptive message so the budget violation is never
    /// silently ignored.
    fn prepare_query(&self, q: &[f32]) -> Self::Query {
        let distance_table = self.build_distance_table(q).expect(
            "PqCodec::prepare_query: build_distance_table failed; \
                     if a governor is attached ensure it has sufficient budget",
        );
        PqQuery {
            distance_table,
            raw: q.to_vec(),
        }
    }

    /// Build the `AdcLut` from the precomputed distance table for use by
    /// SIMD rerank kernels (`pshufb` / `vpermb`).