Thomas Kellerer <spam_ea...@gmx.net> writes:
> Hello,
> pg_get_functiondef() can be used quite easily by using a cast to
> regprocedure, like this:
> select pg_get_functiondef('public.foo(text, text, text)'::regprocedure);
> However if the function is defined with an out parameter like this:
> create or replace function foo(p1 text, p2 out text, p3 text)
> ....
> the above cast does not work. Postgres returns an error: "function
> public.foo(text,text,text) does not exist.
> 'public.foo(text, OUT text, text)'::regprocedure does not work either.
> So, what should be the right format to write the string literal that can be
> cast to the correct regprocedure?
Leave out the OUT parameters altogether:
select pg_get_functiondef('public.foo(text, text)'::regprocedure);
Only IN parameters contribute to the function's identity; OUT parameters
are just a variant method of specifying its return type.
Personally I wouldn't randomly mix IN and OUT like that, but put all the
OUT parameters at the end of the list. It seems too confusing otherwise.
regards, tom lane
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