> I am not thrilled about inventing a new column for this, but how about
> a display like so:
>
> regression=# \df nth_value
> List of functions
> Schema | Name | Result data type | Argument data types
> ------------+-----------+------------------+---------------------------------
> pg_catalog | nth_value | anyelement | anyelement, integer OVER window
>
> or some other addition that only shows up when needed.
I think this whole idea is a bad one. In the current release, you can do
DROP FUNCTION Name ( Argument data types )
...and it will work. Maybe you will say that no one is doing this via
a script (which I wouldn't bet on, but it's possible) but I'm sure
people are doing it via cut and paste, because I have done exactly
this thing. Any of the various proposals for hacking up Argument data
types will make this no longer true, and somebody will get confused.
I think you should bite the bullet and add a "type" column (f for
regular function and w for window? could there be others in the
future?).
...Robert