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> > we bite the bullet to the extent of supporting a distinction between
> > physical and logical column numbers, then ISTM there's no strong need
> > to do any of this other stuff at all. I'd expect that an inserted or
> > updated tuple would have a NULL in any physical column position that
> > doesn't have an equivalent logical column, so the space cost
> > is minimal
> > (zero, in fact, if there are any other NULLs in the tuple). Over time
> > the space occupied by deleted-column data would gradually go away as
> > tuples got updated.
>
> This said, I think Hiroshi's patch seems a perfect starting point, no ?
Having phantom columns adds additional complexity to the system overall.
We have to decide we really want it before making things more complex
than they already are.
-- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610)
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