presto-geospatial/src/main/java/io/prestosql/plugin/geospatial/GeoFunctions.java/GeoFunctions/lineLocatePoint
class GeoFunctions:    @SqlNullable
    @Description("Returns a float between 0 and 1 representing the location of the closest point on the LineString to the given Point, as a fraction of total 2d line length.")
    @ScalarFunction("line_locate_point")
    @SqlType(DOUBLE)
    public static Double lineLocatePoint(@SqlType(GEOMETRY_TYPE_NAME) Slice lineSlice, @SqlType(GEOMETRY_TYPE_NAME) Slice pointSlice)
    {
        Geometry line = JtsGeometrySerde.deserialize(lineSlice);
        Geometry point = JtsGeometrySerde.deserialize(pointSlice);

        if (line.isEmpty() || point.isEmpty()) {
            return null;
        }

        GeometryType lineType = GeometryType.getForJtsGeometryType(line.getGeometryType());
        if (lineType != GeometryType.LINE_STRING && lineType != GeometryType.MULTI_LINE_STRING) {
            throw new PrestoException(INVALID_FUNCTION_ARGUMENT, format("First argument to line_locate_point must be a LineString or a MultiLineString. Got: %s", line.getGeometryType()));
        }

        GeometryType pointType = GeometryType.getForJtsGeometryType(point.getGeometryType());
        if (pointType != GeometryType.POINT) {
            throw new PrestoException(INVALID_FUNCTION_ARGUMENT, format("Second argument to line_locate_point must be a Point. Got: %s", point.getGeometryType()));
        }

        return new LengthIndexedLine(line).indexOf(point.getCoordinate()) / line.getLength();
    }