Re: ADD/DROP INHERITS

Greg Stark <gsstark@mit.edu> writes:
> Come to think of it it's pretty strange that you can drop an inherited
> constraint from a child. And doing an experiment it seems you can also DROP
> NOT NULL on a child which is also pretty strange.

Yeah.  I think we had agreed that this is a bug.  Note the TODO entries:
o Prevent parent tables from altering or dropping constraints  like CHECK that are inherited by child tables unless
CASCADE is usedo %Prevent child tables from altering or dropping constraints         like CHECK that were inherited
fromthe parent table
 

> I don't see how to block these operations though unless we either search
> parent classes for constraints to check at run-time or add additional
> dependency records to block dropping these things.

The implementation I had in mind was to add columns similar to attinhcount
and attislocal to pg_constraint.
        regards, tom lane