"Alex Hunsaker" <[EMAIL PROTECTED]> writes:
> On Wed, Feb 20, 2008 at 3:55 PM, Tom Lane <[EMAIL PROTECTED]> wrote:
>> Actually the bug is that ALTER TABLE allows you to do that.  It should
>> not be possible to drop an inherited constraint, but right now there's
>> not enough information in the system catalogs to detect the situation.
>> Fixing this has been on the TODO list for awhile:

> Hrm how about something like the attached patch?

It seems much more restrictive than necessary, plus it does nothing
for the check-constraint case.  My recollection of the previous
discussion about how to fix this was that we needed to add an inhcount
column to pg_constraint, and add entries for not-null constraints (at
least inherited ones) to pg_constraint so that they'd be able to have
inhcount fields.  The latter would also allow us to attach names to
not-null constraints, which I think is required by spec but we've never

                        regards, tom lane

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