Re: pgsql: Fix list_copy_head() with empty Lists

David Rowley <drowley@postgresql.org> writes:
> Fix list_copy_head() with empty Lists

> list_copy_head() given an empty List would crash from trying to
> dereference the List to obtain its length.  Since NIL is how we represent
> an empty List, we should just be returning another empty List in this
> case.

I see that list_copy_head exists in v15 as well.  It appears to have
no callers there, but we'd better fix it anyway in case somebody
back-patches a fix that uses it.

Or, maybe, remove it in 15?

            regards, tom lane