presto-parser/src/main/java/io/prestosql/sql/tree/RowDataType.java/RowDataType/toString
class RowDataType:        @Override
        public String toString()
        {
            StringBuilder builder = new StringBuilder();
            if (name.isPresent()) {
                builder.append(name.get());
                builder.append(" ");
            }
            builder.append(type);

            return builder.toString();
        }