Re: BUG #5123: bug in window function "last_value"

On Fri, Oct 16, 2009 at 04:45:55PM +0300, Heikki Linnakangas wrote:
> Andrey wrote:
> > select id, first_value(id) over(order by id), last_value(id) over(order by
> > id) from t;
> >
> > RESULT:
> >  id | first_value | last_value
> > ----+-------------+------------
> >   1 |           1 |          1
> >   2 |           1 |          2
> >   3 |           1 |          3
> > (3 rows)
> >
> > fist_value - good, last_value - bad
>
> Looks ok to me. What did you expect?

I think what the OP was expecting was to have the last value be 3
instead of changing.  This is at least a POLA violation.

Cheers,
David.
--
David Fetter <david@fetter.org> http://fetter.org/
Phone: +1 415 235 3778  AIM: dfetter666  Yahoo!: dfetter
Skype: davidfetter      XMPP: david.fetter@gmail.com

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