Re: bugfix: --echo-hidden is not supported by \sf statements

On 02/26/2013 02:12 PM, Tom Lane wrote:
> Stephen Frost <sfrost@snowman.net> writes:
>> * Pavel Stehule (pavel.stehule@gmail.com) wrote:
>>> Minimally \ef needs exact specification - you cannot to edit more
>>> functions in same time. So we have to be able identify if there are no
>>> selected function or if there are more functions. We can write a
>>> auxiliary function that returns list of function oids for specified
>>> signature - but it is relative much more code and it is hard to
>>> implement for older versions - but we can use regproc and regprocedure
>>> there.
>> Using regproc and regprocedure is the wrong approach here and will be a
>> pain to maintain as well as a backwards incompatible change to how they
>> behave.  We have solved this problem already and what \df does is exactly
>> the right answer.
> Well, actually I think Pavel's got a point.  What about overloaded
> functions?  In \df we don't try to solve that problem, we just print
> them all:
>
> regression=# \df abs
>                            List of functions
>     Schema   | Name | Result data type | Argument data types |  Type
> ------------+------+------------------+---------------------+--------
>   pg_catalog | abs  | bigint           | bigint              | normal
>   pg_catalog | abs  | double precision | double precision    | normal
>   pg_catalog | abs  | integer          | integer             | normal
>   pg_catalog | abs  | numeric          | numeric             | normal
>   pg_catalog | abs  | real             | real                | normal
>   pg_catalog | abs  | smallint         | smallint            | normal
> (6 rows)
>
> In \ef you need to select just one of these functions, but \df doesn't
> have any ability to do that:
>
> regression=# \df abs(int)
>                         List of functions
>   Schema | Name | Result data type | Argument data types | Type
> --------+------+------------------+---------------------+------
> (0 rows)
>
> Now, maybe we *should* teach \df about handling parameter types and
> then \ef can piggyback on it, but that code isn't there now.
>
> 			


If we're going to mess with this area can I put in a plea to get \ef and 
\sf to handle full parameter specs? I want to be able to c&p from the 
\df output to see the function. But here's what happens:

    andrew=# \df json_get
                                              List of functions
        Schema   |   Name   | Result data type |              Argument
    data types              |  Type
    ------------+----------+------------------+-----------------------------------------------+--------
      pg_catalog | json_get | json             | from_json json, element
    integer               | normal
      pg_catalog | json_get | json             | from_json json,
    VARIADIC path_elements text[] | normal
    (2 rows)


    andrew=# \sf json_get (from_json json, element integer )
    ERROR:  invalid type name "from_json json"


cheers

andrew