Rumpi Gravenstein <rgravens(at)gmail(dot)com> writes:
> I've been confound by the following behavior that I see in one of our
> PostgreSQL 16 instances. In this case I am running this script from psql.
I'd bet there is another function named _sa_setup_role() that takes
some kind of array, and the parser is resolving the ambiguity by
choosing that one.
"\df _sa_setup_role" would be illuminating.
regards, tom lane