On 12/8/14, 9:18 AM, Tom Lane wrote:
The short answer is that SQL domains are not zero-cost type aliases.
Perhaps there would be value in having a feature that*is*  a a zero-cost
alias, but it wouldn't be a domain.

Note that you can actually re-use the support functions of one data type to create a new 
one. So if you wanted a special type called "document" that actually behaved 
the same as text you could do that fairly easily (though not as easily as creating a 
domain).

If we were going to expend energy here, I suspect it would be more useful to look at ways 
of creating new types without requiring C. C isn't an option on many (even most) 
environments in today's "cloud" world, aside from the intimidation factor. 
There are comments in the code that hypothesize about making cstring a full type; that 
might be all that's needed.
--
Jim Nasby, Data Architect, Blue Treble Consulting
Data in Trouble? Get it in Treble! http://BlueTreble.com


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