Re: ALTER TABLE ADD COLUMN fast default

Hi,

On 2018-03-30 10:08:54 +1030, Andrew Dunstan wrote:
> On Fri, Mar 30, 2018 at 5:00 AM, Andres Freund <andres@anarazel.de> wrote:
> > this'll trigger one slot_getsomeattrs(slot, 2) call from within qual
> > evaluation, and then a slot_getsomeattrs(slot, 4) from within the
> > projection code.  If you then imagine a tuple where only the first
> > column exists physically, we'd copy b twice, because attno is only going
> > to be one 1.  I think we might just want to check tts nvalid in
> > getmissingattrs?

> OK. so add something like this to the top of slot_getmissingattrs()?
> 
>     startAttNum = Max(startAttNum, slot->tts_nvalid);

Yea, I think that should do the trick.

Greetings,

Andres Freund