From: fatih ozturk <ozturkfa@yahoo.com>
To: pgsql-admin@postgresql.org
Subject: Re: Partitionin with check functions
Date: Tue, 31 Mar 2009 04:07:08 -0700 (PDT)
Message-ID: <397285.75133.qm@web111503.mail.gq1.yahoo.com> (raw)
Thank you
"Yes, it does. It might be worthwile to use
WHERE sel=123 AND mod(sel,6)=3
I think you could use a rule to add the mod() condition automatically.
"
this is great idea
But the problem is i did not accomplish to find a way to change query like
partitioning=# select * from mainlog where sel=22;
to
partitioning=# select * from mainlog where sel=22 and mod(sel,6)=4;
"on select" rules just creates views, dont routes the queries.
I cant use tirggers for selects.
Is there exists a way of changing select query before query plan generated?
Any ideas?
I am very appreciative for your answers and interest.
Thanks
--- On Mon, 3/30/09, Harald Fuchs <hari.fuchs@gmail.com> wrote:
From: Harald Fuchs <hari.fuchs@gmail.com>
Subject: Re: [ADMIN] Partitionin with check functions
To: pgsql-admin@postgresql.org
Date: Monday, March 30, 2009, 4:08 PM
In article <2499.1238420859@sss.pgh.pa.us>,
Tom Lane <tgl@sss.pgh.pa.us> writes:
> In particular, a constraint like "sel=123" is *not* going to lead the
> planner to draw any conclusions about the value of "mod(sel,6)".
> Now, if you'd written "WHERE mod(sel,6)=3", I think it would draw
> the right conclusions.
Yes, it does. It might be worthwile to use
WHERE sel=123 AND mod(sel,6)=3
I think you could use a rule to add the mod() condition automatically.
--
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To: pgsql-admin@postgresql.org
Cc: ozturkfa@yahoo.com
Subject: Re: Partitionin with check functions
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