Re: Review: UNNEST (and other functions) WITH ORDINALITY

The only other case I could come up with in my regression tests is pretty esoteric:

CREATE COLLATION nulls (locale='C');
ALTER OPERATOR CLASS text_ops USING btree RENAME TO first;
CREATE TABLE nulls_first(t text);
CREATE INDEX nulls_first_i ON nulls_first(t COLLATE nulls first);

I'm not 100% sure there aren't other cases where this can occur though.