Hi Chris,
On 05/04/2009 09:21 PM, Chris Browne wrote:
robertmh...@gmail.com (Robert Haas) writes:
On Mon, May 4, 2009 at 10:10 AM, Andres Freund<and...@anarazel.de> wrote:
Would a patch adding 'IF EXISTS' support to:
- ALTER TABLE ... DROP COLUMN
- ALTER TABLE ... DROP CONSTRAINT
possibly be accepted?
Can't speak for the committers, but I've wished for this a time or two myself.
For constraints, it's easy enough to treat that as idempotent; it's no
big deal to drop and re-add a constraint.
For columns, I'd *much* more frequently be interested in
ALTER TABLE ... ADD COLUMN IF NOT EXISTS ...
Note that this is distinctly NOT the same as:
ALTER TABLE ... DROP COLUMN IF EXISTS ...
ALTER TABLE ... ADD COLUMN ...
Yes, I would like to have that myself - but this seems to open a way
much bigger can of worms.
Also the problem solved by both suggestions are not completely congruent
- so I thought better tackle the easier one first before starting a long
and arduous discussion...
Andres
--
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers
