From: | jwieck(at)debis(dot)com (Jan Wieck) |
---|---|
To: | taral(at)mail(dot)utexas(dot)edu (Taral) |
Cc: | maillist(at)candle(dot)pha(dot)pa(dot)us, hackers(at)postgreSQL(dot)org |
Subject: | Re: [HACKERS] RE: [GENERAL] Long update query ? (also Re: [GENERAL] CNF vs. DNF) |
Date: | 1998-10-02 17:31:18 |
Message-ID: | m0zP930-000EBQC@orion.SAPserv.Hamburg.dsh.de |
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Lists: | pgsql-general pgsql-hackers |
>
> > > Create a temporary oid hash? (for each table selected on, I guess)
> >
> > What I did with indexes was to run the previous OR clause index
> > restrictions through the qualification code, and make sure it failed,
> > but I am not sure how that is going to work with a more complex WHERE
> > clause. Perhaps I need to restrict this to just simple cases of
> > constants, which are easy to pick out an run through. Doing this with
> > joins would be very hard, I think.
>
> Actually, I was thinking more of an index of returned rows... After each
> subquery, the backend would check each row to see if it was already in the
> index... Simple duplicate check, in other words. Of course, I don't know how
> well this would behave with large tables being returned...
>
> Anyone else have some ideas they want to throw in?
>
> Taral
>
But what about unions of join queries? Which OID's then should
be checked against which? And unions from view selects? There
are no OID's at all after rewriting.
Jan
--
#======================================================================#
# It's easier to get forgiveness for being wrong than for being right. #
# Let's break this rule - forgive me. #
#======================================== jwieck(at)debis(dot)com (Jan Wieck) #
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