Обсуждение: Multiple parameters with the same name for functions.

Hi,

As I was working on my code generator app, I noticed that one is able to 
create a function with multiple parameters with the same name. For example:

create or replace function func_test(id integer,id varchar, id 
timestamp) returns void as
$$
begin   raise notice '%',id;
end;
$$
language plpgsql;

Is this a known behavior or a bug?

Regards,
Gevik.

On Sun, Apr 26, 2009 at 3:32 PM, Gevik Babakhani <pgdev@xs4all.nl> wrote:
> Hi,
>
> As I was working on my code generator app, I noticed that one is able to
> create a function with multiple parameters with the same name. For example:
>

you mean this http://www.postgresql.org/docs/current/static/xfunc-overload.html?

--
Atentamente,
Jaime Casanova
Soporte y capacitación de PostgreSQL
Asesoría y desarrollo de sistemas
Guayaquil - Ecuador
Cel. +59387171157

No.   I meant: create function foo(PAR1 varchar, PAR1 int, PAR1 uuid). 
Note PAR1


Jaime Casanova wrote:
> On Sun, Apr 26, 2009 at 3:32 PM, Gevik Babakhani <pgdev@xs4all.nl> wrote:
>   
>> Hi,
>>
>> As I was working on my code generator app, I noticed that one is able to
>> create a function with multiple parameters with the same name. For example:
>>
>>     
>
> you mean this http://www.postgresql.org/docs/current/static/xfunc-overload.html?
>
>   

Gevik Babakhani <pgdev@xs4all.nl> writes:
> As I was working on my code generator app, I noticed that one is able to 
> create a function with multiple parameters with the same name.

I'm pretty sure this has come up before and we concluded that
prohibiting it in CREATE FUNCTION wasn't terribly exciting.  For
instance there is no compelling reason I shouldn't be able to define

create function sum(addend int, addend int) returns ...

In the context of plpgsql specifically, it might make sense to
disallow it.  I notice that plpgsql is pretty sloppy about other
cases of conflicting declarations:

regression=# create function foo() returns void as $$
regression$# declare 
regression$#   id int := 1;
regression$#   id text := 'foo';
regression$# begin
regression$#   raise notice '%', id;
regression$# end$$ language plpgsql;
ERROR:  syntax error at or near "id"
LINE 4:   id text := 'foo';         ^
regression=# 

OK, failure is expected, but "syntax error"?
        regards, tom lane