Re: ALTER TYPE 3: add facility to identify further no-work cases

On Wed, Jan 26, 2011 at 6:06 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Robert Haas <robertmhaas@gmail.com> writes:
>> Well, I guess my thought was that we what we were doing is extending
>> the coercion system to be able to make decisions based on both type
>> OID and typemod.
>
> Well, that's an interesting thought, but the proposal at hand is far
> more limited than that --- it's only an optimization that can be applied
> in limited situations.  If we want to do something like what you're
> suggesting here, it's not going to get done for 9.1.

Eh, why is this not entirely straightforward?  *scratches head*

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company