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Re: TODO items for window functions

From: "Robert Haas" <robertmhaas(at)gmail(dot)com>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: "Andrew Dunstan" <andrew(at)dunslane(dot)net>, "David Fetter" <david(at)fetter(dot)org>, "Hitoshi Harada" <umi(dot)tanuki(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: TODO items for window functions
Date: 2009-01-01 13:42:42
Message-ID: 603c8f070901010542o4bdc29c8if298f13d5e3e8080@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
> 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

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