presto-parser/src/main/java/io/prestosql/sql/tree/AddColumn.java/AddColumn/equals
class AddColumn:    @Override
    public boolean equals(Object obj)
    {
        if (this == obj) {
            return true;
        }
        if ((obj == null) || (getClass() != obj.getClass())) {
            return false;
        }
        AddColumn o = (AddColumn) obj;
        return Objects.equals(name, o.name) &&
                Objects.equals(column, o.column);
    }