presto-geospatial/src/main/java/io/prestosql/plugin/geospatial/GeoFunctions.java/GeoFunctions/stBuffer
class GeoFunctions:    @SqlNullable
    @Description("Returns the geometry that represents all points whose distance from the specified geometry is less than or equal to the specified distance")
    @ScalarFunction("ST_Buffer")
    @SqlType(GEOMETRY_TYPE_NAME)
    public static Slice stBuffer(@SqlType(GEOMETRY_TYPE_NAME) Slice input, @SqlType(DOUBLE) double distance)
    {
        if (isNaN(distance)) {
            throw new PrestoException(INVALID_FUNCTION_ARGUMENT, "distance is NaN");
        }

        if (distance < 0) {
            throw new PrestoException(INVALID_FUNCTION_ARGUMENT, "distance is negative");
        }

        if (distance == 0) {
            return input;
        }

        OGCGeometry geometry = deserialize(input);
        if (geometry.isEmpty()) {
            return null;
        }
        return serialize(geometry.buffer(distance));
    }