Function ST_LineInterpolatePoint 

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

Represents the MySQL ST_LineInterpolatePoint function