From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, 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: | 2009-02-04 19:52:40 |
Message-ID: | 200902041952.n14Jqee11741@momjian.us |
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Lists: | pgsql-hackers |
Robert Haas wrote:
> > 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?).
Are we doing anything for this for 8.4?
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
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