On Thu, 2002-07-18 at 00:56, Christopher Kings-Lynne wrote:
> I believe Tom mentioned that having BETWEEN as a node would allow him to do
> some sort of funky optimiser improvement. Is that already done or does he
> still need to do it?
I don't know what improvement this would be. I only touched the parser
and executor.
It only executes each segment of the between tree once so the only
optimization I can think of would be to try to execute the most likely
to fail leaf first.
> > -----Original Message-----
> > From: pgsql-patches-owner@postgresql.org
> > [mailto:pgsql-patches-owner@postgresql.org]On Behalf Of Bruce Momjian
> > Sent: Thursday, 18 July 2002 12:42 PM
> > To: Rod Taylor
> > Cc: pgsql-patches@postgresql.org
> > Subject: Re: [PATCHES] Between Node
> >
> >
> >
> > Patch applied. Thanks.
> >
> > ------------------------------------------------------------------
> > ---------
> >
> >
> > Rod Taylor wrote:
> > > Finished the Between patch Christopher started.
> > >
> > > Implements between (symmetric / asymmetric) as a node.
> > >
> > > Executes the left or right expression once, makes a Const out of the
> > > resulting Datum and executes the >=, <= portions out of the Const sets.
> > >
> > > Of course, the parser does a fair amount of preparatory work for this to
> > > happen.
> >
> > [ Attachment, skipping... ]
> >
> > >
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> > --
> > Bruce Momjian | http://candle.pha.pa.us
> > pgman@candle.pha.pa.us | (610) 853-3000
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