Re: Split_Part w/negative integer does not work

PG Doc comments form <noreply(at)postgresql(dot)org> writes:
> Page: https://www.postgresql.org/docs/15/functions-string.html
> Documentation
> split_part ( string text, delimiter text, n integer ) → text
> Splits string at occurrences of delimiter and returns the n'th field
> (counting from one), or when n is negative, returns the |n|'th-from-last
> field.
> split_part('abc~(at)~def~@~ghi', '~(at)~', 2) → def
> split_part('abc,def,ghi,jkl', ',', -2) → ghi

> Observation
> SELECT split_part('abc,def,ghi,jkl', ',', -1);
> generates
> ERROR: field position must be greater than zero
> SQL state: 22023

Apparently, you are reading the v15 documentation and expecting it
to be exactly correct for some older server version. The described
behavior came in in v14.

regards, tom lane