Function ST_PointAtDistance 

pub fn ST_PointAtDistance<ls, distance>(
    ls: ls,
    distance: distance,
) -> ST_PointAtDistance<<ls as AsExpression<LineString>>::Expression, <distance as AsExpression<Double>>::Expression>
where
    ls: AsExpression<LineString>,
    distance: AsExpression<Double>,

Represents the MySQL ST_PointAtDistance function