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Re: Add column if not exists (CINE)

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>, Takahiro Itagaki <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>, Kjell Rune Skaaraas <kjella79(at)yahoo(dot)no>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Add column if not exists (CINE)
Date: 2010-04-28 16:03:32
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Lists: pgsql-hackers
On Wed, Apr 28, 2010 at 11:20 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> I don't believe you are fairly stating the consensus from previous
>> discussion and I believe that you are actually in the minority on this
>> one.  I agree that we probably don't need to support this for object
>> types for which CREATE OR REPLACE is available or can be made
>> available, but that isn't feasible for all object types - tables and
>> columns being the obvious examples.
> What's obvious about it?  In particular, I should think that ADD OR
> REPLACE COLUMN would usefully be defined as "ADD if no such column,
> else ALTER COLUMN as necessary to match this spec".  Dropping the
> ALTER part of that has no benefit except to lazy implementors; it
> certainly is not more useful to users if they can't be sure of the
> column properties after issuing the command.

Actually, that's a good idea.  But how will you handle tables?


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