Re: [HACKERS] 6.5 beta and ORDER BY patch

It is my assumption this has been applied to 6.5 beta, right?

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> 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
>
>

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