From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Josh Kupershmidt <schmiddy(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: patch: Allow \dd to show constraint comments |
Date: | 2011-06-06 18:10:06 |
Message-ID: | BANLkTindqgQ0D8creWhd4PkOzu_v_PtvGA@mail.gmail.com |
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Lists: | pgsql-hackers |
On Mon, Jun 6, 2011 at 2:06 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> On Mon, Jun 6, 2011 at 1:03 PM, Alvaro Herrera
>> <alvherre(at)commandprompt(dot)com> wrote:
>>> Hmm, if we're going to have pg_comments as a syntactic sugar kind of
>>> thing, it should output things in format immediately useful to the user,
>>> i.e. relation/column/etc names and not OIDs. The OIDs would force you
>>> to do lots of joins just to make it readable.
>
>> Well, that's basically what this is doing. See the objname/objtype
>> columns. It's intended that the output of this view should match the
>> format that COMMENT takes as input. But propagating the OIDs through
>> is sensible as well, because sometimes people may want to do other
>> joins, filtering, etc.
>
> Is it also propagating the catalog OID through? Because joining on OID
> alone is not to be trusted.
Yep.
> I tend to agree with Alvaro's viewpoint here: anybody who wants to deal
> directly in OIDs is better off joining directly to pg_description, and
> not going through the rather large overhead that this view is going to
> impose. So we should just make this a purely user-friendly view and be
> done with it, not try to create an amalgam that serves neither purpose
> well.
Possibly. On the other hand we have things like pg_tables floating
around that are basically useless because you can't get the OID
easily. The information_schema suffers from this problem as well. I
get what you're saying, but I think we should think two or three times
very carefully before throwing away the OID in a situation where it
can easily be provided.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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