Re: range_agg

so 18. 1. 2020 v 17:07 odesílatel Paul A Jungwirth <
pj(at)illuminatedcomputing(dot)com> napsal:

> On Sat, Jan 18, 2020 at 7:20 AM Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
> wrote:
> > Can be nice to have a polymorphic function
> >
> > multirange(anymultirange, anyrange) returns anymultirange. This
> functions should to do multirange from $2 to type $1
> >
> > It can enhance to using polymorphic types and simplify casting.
>
> Thanks for taking another look! I actually have that already but it is
> named anymultirange:
>
> regression=# select anymultirange(int4range(1,2));
> anymultirange
> ---------------
> {[1,2)}
> (1 row)
>
> Will that work for you?
>

It's better than I though

> I think I only wrote that to satisfy some requirement of having an
> anymultirange type, but I agree it could be useful. (I even used it in
> the regress tests.) Maybe it's worth documenting too?
>

yes

> > when I tried to write this function in plpgsql I got
> >
> > create or replace function multirange(anymultirange, anyrange) returns
> anymultirange as $$
> > begin
> > execute format('select $2::%I', pg_typeof($1)) into $1;
> > return $1;
> > end;
> > $$ language plpgsql immutable strict;
> >
> > ERROR: unrecognized typtype: 109
> > CONTEXT: compilation of PL/pgSQL function "multirange" near line 1
>
> Hmm, I'll add a test for that and see if I can find the problem.
>

ok

> Thanks!
> Paul
>