presto-geospatial/src/main/java/io/prestosql/plugin/geospatial/GeoFunctions.java/GeoFunctions/stAsText
class GeoFunctions:    @Description("Returns the Well-Known Text (WKT) representation of the geometry")
    @ScalarFunction("ST_AsText")
    @SqlType(VARCHAR)
    public static Slice stAsText(@SqlType(GEOMETRY_TYPE_NAME) Slice input)
    {
        return utf8Slice(deserialize(input).asText());
    }