Re: Why so few built-in range types?

On Wed, Nov 30, 2011 at 1:08 PM, Jeff Davis  wrote:
> One that I'd like to see is an IP address type, but that's complicated
> because inet and cidr support netmasks.

A CIDR address defines a range all by itself, without packing any
other type on top.  It just needs GIST support, and an indexable
operator for "contains or is contained by"; then, you can define an
exclusion constraint over a CIDR column to enforce a
no-duplicate-or-overlapping-IP-ranges rule.  I started working on that
at one point, but I didn't have as much enthusiasm as the task needed
so I gave up before accomplishing anything particularly useful.

-- 
Robert Haas
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