Function distance_nd_bbs

pub fn distance_nd_bbs<T, U>(
    left: T,
    right: U,
) -> DistanceNdBBs<T, U::Expression>
where
    T: Expression,
    <T as Expression>::SqlType: SqlType,
    U: AsExpression<T::SqlType>,

The <<#>> operator returns the n-D distance between A and B bounding boxes.