fn distance_all(&self, _k_hint: usize) -> Vec<f32> {
    match self.storage.distance_type {
        DistanceType::L2 | DistanceType::Cosine => self
            .storage
            .chunks
            .iter()
            .flat_map(|c| {
                c.sq_codes
                    .values()
                    .chunks_exact(c.dim())
                    .map(|sq_codes| l2_distance_uint_scalar(sq_codes, &self.query_sq_code) * self.scale)
            })
            .collect(),
        DistanceType::Dot => self
            .storage
            .chunks
            .iter()
            .flat_map(|c| {
                c.sq_codes
                    .values()
                    .chunks_exact(c.dim())
                    .map(|sq_codes| dot_distance(sq_codes, &self.query_sq_code) * self.scale)
            })
            .collect(),
        _ => panic!("We should not reach here: sq distance can only be L2 or Dot"),
    }
}