presto-parser/src/main/java/io/prestosql/sql/tree/RowDataType.java/Field/Field
class Field:        public Field(NodeLocation location, Optional<Identifier> name, DataType type)
        {
            super(Optional.of(location));

            this.name = requireNonNull(name, "name is null");
            this.type = requireNonNull(type, "type is null");
        }