Function postgis_diesel::operators::distance_3d_trajectories

pub fn distance_3d_trajectories<T, U>(
    left: T,
    right: U
) -> Distance3dTrajectories<T, U::Expression>where
    T: Expression,
    <T as Expression>::SqlType: SqlType,
    U: AsExpression<T::SqlType>,

The |=| operator returns the 3D distance between two trajectories.