presto-atop/src/main/java/io/prestosql/plugin/atop/AtopTable.java/AtopColumn/AtopColumn
class AtopColumn:        private AtopColumn(String name, TypeSignature type, AtopColumnParser parser)
        {
            this.name = requireNonNull(name, "name is null");
            this.type = requireNonNull(type, "type is null");
            this.parser = requireNonNull(parser, "parser is null");
        }