presto-main/src/main/java/io/prestosql/execution/Column.java/Column/equals
class Column:    @Override
    public boolean equals(Object o)
    {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        Column that = (Column) o;

        return Objects.equals(this.name, that.name) &&
                Objects.equals(this.type, that.type);
    }