Обсуждение: to be a multirange or not be, that's the question
Ok, subject was a bit philosophical but this message I just found is quite confusing. """ regression=# select cast(null as anyrange) &> cast(null as anymultirange); ERROR: argument declared anymultirange is not a multirange type but type anymultirange """ -- Jaime Casanova Director de Servicios Profesionales SystemGuards - Consultores de PostgreSQL
On Saturday, November 6, 2021, Jaime Casanova <jcasanov@systemguards.com.ec> wrote:
Ok, subject was a bit philosophical but this message I just found is
quite confusing.
"""
regression=# select cast(null as anyrange) &> cast(null as anymultirange);
ERROR: argument declared anymultirange is not a multirange type but type anymultirange
"""
I get that it is hard to parse but it is unambiguously correct. It does seem to presume that one understands how polymorphic pseudo-types work (the supplied query was written without that knowledge applied). I can envision some improvements here though it would depend a lot on the actual implementation. I’m also curious as to why we get as far the operator invocation when casting literals to polymorphic pseudo-types is supposedly an invalid thing to do.
David J.