RE: ALTER TABLE DROP COLUMN

> -----Original Message-----
> From: Tom Lane [mailto:tgl@sss.pgh.pa.us]
> 
> "Hiroshi Inoue" <Inoue@tpf.co.jp> writes:
> > create table t1 (i1 int4);
> > create table t2 (i2 int4) inherits t1;
> > create table t3 (i3 int4) inherits t2;
> > alter table t1 add column i4 int4;
> 
> > For each table,the list of (column, logical number, physical number)
> > would be as follows.
> 
> > t1   (i1, 1, 1) (i4, 2, 2)
> > t2   (i1, 1, 1) (i4, 2, 3) (i2, 3, 2)
> > t3   (i1, 1, 1) (i4, 2, 4) (i2, 3, 2) (i3, 4, 3)
> 
> > At this point the compilation of 'select * from t1(*?)' would mean
> > 	select (physical #1),(physical #2) from t1  +
> > 	select (physical #1),(physical #3) from t2  +
> > 	select (physical #1),(physical #4) from t3 
> 
> > Note that physical # aren't common for column i4.
> 
> That's no different from the current situation:

Yes your proposal has no problem currently. I'm only
anxious about oo feature. Recently there has been a
discussion around oo and we would be able to expect 
the progress in the near future. If oo people never mind,
your proposal would be OK.
 
Regards.

Hiroshi Inoue
Inoue@tpf.co.jp