Re: Remove comment about manually flipping attnotnull

On Thu, Jul 24, 2014 at 12:51:09PM -0400, Tom Lane wrote:
> Andres Freund <andres@2ndquadrant.com> writes:
> > catalogs.sgml has this comment:
> >        This represents a not-null constraint.  It is possible to
> >        change this column to enable or disable the constraint.
> 
> > Someone on irc just took that as "permission" to do so manually...
> 
> Did anything especially bad happen?  Obviously, turning it on wouldn't
> have verified that the column contains no nulls, but hopefully anyone
> who's bright enough to do manual catalog updates would realize that.
> I think things would generally have worked otherwise, in particular
> sinval signalling would have happened (IIRC).
> 
> > That comment has been there since 1efd7330c/2000-11-29, in the the
> > initial commit adding catalogs.sgml. Does somebody object to just
> > removing the second part of the comment in all branches?
> 
> Seems like a reasonable idea, in view of the fact that we're thinking
> about adding pg_constraint entries for NOT NULL, in which case frobbing
> attnotnull by itself would definitely be a bad thing.

Change applied to head.

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