Re: RFC: Restructuring pg_aggregate

Bruce Momjian wrote:
> 
> Hiroshi Inoue wrote:
> > Christopher Kings-Lynne wrote:
> > >
> I think that is why Tom was suggesting making all the column values NULL
> and removing the pg_attribute row for the column.  With a NULL value, it
> doesn't take up any room in the tuple, and with the pg_attribute column
> gone, no one will see that row.  The only problem is the gap in attno
> numbering.  How big a problem is that?

There's no problem with applications which don't inquire
of system catalogs(pg_attribute). Unfortunately we have 
been very tolerant of users' access on system tables and
there would be pretty many applications which inquire of
pg_attribute.

regards,
Hiroshi Inoue