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Re: Different error messages executing CREATE TABLE or ALTER TABLE to create a column "xmin"

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Vik Reykja <vikreykja(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Different error messages executing CREATE TABLE or ALTER TABLE to create a column "xmin"
Date: 2012-01-26 16:58:06
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Lists: pgsql-hackers
On Thu, Jan 26, 2012 at 11:29 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> However, I think we ought to handle
>> renaming a column symmetrically to adding one.
> Yeah, I was thinking the same.
>> So here's a revised version of your patch that does that.
> This looks reasonable to me, except that possibly the new error message
> text could do with a bit more thought.  It seems randomly unlike the
> normal message, and I also have a bit of logical difficulty with the
> wording equating a "column" with a "column name".  The wording that
> is in use in the existing CREATE TABLE case is
> column name \"%s\" conflicts with a system column name
> We could do worse than to use that verbatim, so as to avoid introducing
> a new translatable string.  Another possibility is
> column \"%s\" of relation \"%s\" already exists as a system column
> Or we could keep the primary errmsg the same as it is for a normal
> column and instead add a DETAIL explaining that this is a system column.

I intended for the message to match the CREATE TABLE case.  I think it
does, except I see now that Vik's patch left out the word "name" where
the original string has it.  So I'll vote in favor of your first
option, above, since that's what I intended anyway.

Robert Haas
The Enterprise PostgreSQL Company

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