> -----Original Message-----
> From: owner-pgsql-hackers(at)postgreSQL(dot)org
> [mailto:owner-pgsql-hackers(at)postgreSQL(dot)org]On Behalf Of Zeugswetter
> Andreas SB
>
> > "Hiroshi Inoue" <Inoue(at)tpf(dot)co(dot)jp> writes:
> > > My idea is as follows.
> >
> > > 1)add a visibile/invisible flag to pg_attribute
>
> might use a xid as flag, so rows before xid have the column, rows after
> xid don't have it.
>
>From where do we get the xid ?
Regards.
Hiroshi Inoue
Inoue(at)tpf(dot)co(dot)jp