Re: MIN/MAX functions for a record

Hi,

> Exactly Tom, I see no fundamental problem for it not to be implemented, since comparison operator is already implemented. In fact, MIN/MAX should work for all types for which comparison operator is defined.

On second thought, this should work reasonably well.

PFA a WIP patch. At this point it implements only MAX(record), no MIN, no tests:

```
=# SELECT MAX(row(year, month)) FROM (VALUES(2025, 1), (2024,2)) x(year, month);
   max
----------
 (2025,1)
```

One thing I'm not 100% sure of is whether record_larger() should make
a copy of its arguments or the current implementation is safe.

-- 
Best regards,
Aleksander Alekseev