public PointExpression<Point> pointN(int idx) {
        return GeometryExpressions.pointOperation(SpatialOps.POINTN, mixin, ConstantImpl.create(idx));
    }
Returns the specified Point N in this LineString.

@param idx one-based index of element
@return matched element
querydsl-spatial/src/main/java/com/querydsl/spatial/LineStringExpression.java