Re: Distinct types

Simon Riggs wrote:
> On Tue, 2008-11-25 at 12:21 +0200, Peter Eisentraut wrote:
>> Peter Eisentraut wrote:
>>> Here is an implementation of distinct types,
>> I'm withdrawing this patch from the current commit fest for further 
>> work.  For the record, I have attached the current patch, including the 
>> documentation work by Jeff Davis.
> 
> Shame, this was sorely needed.

I understand, but the work required to make it work properly is too much 
under the commit fest spirit right now.  In particular, I'm thinking we 
should try to devise a clever way to make the CREATE ORDERING facility 
that SQL has for user-defined types interface with our more general 
operator and operator class mechanisms.  This would then also benefit 
other sorts of user-defined types.  There are also a number of unclear 
assumptions about the domain behavior implicitly in the system that will 
possibly require a lengthy shaking-out process if we add other sorts of 
derived types.