David Rowley <dgrowleyml(at)gmail(dot)com> writes:
> * I think list_truncate(list_copy(list), n) is a pretty bad way to
> copy the first n elements of a list, especially when n is likely to be
> 0 most of the time. I think we should just add a function called
> list_copy_head(). We already have list_copy_tail().
Agreed, but I think there are other instances of that idiom that
should be cleaned up while you're at it.
> I think the first 3 are worth fixing in PG15 since all that code is
> new to that version. The 4th, I'm so sure about.
I'd say keeping v15 and v16 in sync here is worth something.
regards, tom lane