presto-main/src/main/java/io/prestosql/sql/SqlPath.java/SqlPath/toString
class SqlPath:    @Override
    public String toString()
    {
        if (rawPath.isPresent()) {
            return Joiner.on(", ").join(getParsedPath());
        }
        //empty string is only used for an uninitialized path, as an empty path would be \"\"
        return "";
    }