RE: [HACKERS] 6.5 beta and ORDER BY patch

> -----Original Message-----
> From: Bruce Momjian [mailto:maillist(at)candle(dot)pha(dot)pa(dot)us]
> Sent: Sunday, May 09, 1999 8:56 PM
> To: Hiroshi Inoue
> Cc: Hannu Krosing; David Hartwig; Jan Wieck; pgsql-hackers
> Subject: Re: [HACKERS] 6.5 beta and ORDER BY patch
>
>
> It is my assumption this has been applied to 6.5 beta, right?
>

It has been applied with subject [Index backward scan patch].
However it doesn't include a change to omit sorting in all descending
ORDER BY cases.

Thanks.

Hiroshi Inoue
Inoue(at)tpf(dot)co(dot)jp

> [Charset iso-8859-1 unsupported, filtering to ASCII...]
> > Hello all,
> >
> > > -----Original Message-----
> > > From: owner-pgsql-hackers(at)postgreSQL(dot)org
> > > [mailto:owner-pgsql-hackers(at)postgreSQL(dot)org]On Behalf Of Hannu Krosing
> > > Sent: Thursday, February 04, 1999 3:43 AM
> > > To: Jan Wieck
> > > Cc: hackers(at)postgreSQL(dot)org
> > > Subject: Re: [HACKERS] 6.5 beta and ORDER BY patch
> > >
> >
> > [snip]
> >
> > >
> > > After that the reverse index scans, so that the index that are
> > > backwards can also be used for sorting.
> > > BTW, can this be easily implemented/effective in PostgreSQL or are
> > > our btree indexes optimised for forward scans ?
> > >
> >
> > PostgreSQL seems to have the ability to scan Index backward
> > because we can execute "fetch backward" command.
> > IMHO _bt_first() fucntion used to find first item in a scan should
> > be changed to work well in case of backward positioning.
> >
> > I think this change also gives the partial solution for the problem
> > [ [HACKERS] Cursor Movement - Past the End ] reported by
> > David Hartwig.
> >
> > I have a sample code for this change.
> > I can send it if someone want to check or test it.
> >
> > Thanks.
> >
> > Hiroshi Inoue
> > Inoue(at)tpf(dot)co(dot)jp
> >
> >
>
>
> --
> Bruce Momjian | http://www.op.net/~candle
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