presto-blackhole/src/main/java/io/prestosql/plugin/blackhole/BlackHoleColumnHandle.java/BlackHoleColumnHandle/equals
class BlackHoleColumnHandle:    @Override
    public boolean equals(Object obj)
    {
        if (this == obj) {
            return true;
        }
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }
        BlackHoleColumnHandle other = (BlackHoleColumnHandle) obj;
        return Objects.equals(this.name, other.name) &&
                Objects.equals(this.columnType, other.columnType);
    }