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Add Ross's email to schema.

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Bruce Momjian 2001-06-04 20:29:08 +00:00
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@ -100,3 +100,82 @@ Ravensfield Digital Resource Group, Ltd.
(740) 587-0114
www.ravensfield.com
From reedstrm@rice.edu Wed May 23 10:59:42 2001
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Date: Wed, 23 May 2001 09:56:41 -0500
From: "Ross J. Reedstrom" <reedstrm@rice.edu>
To: Bruce Momjian <pgman@candle.pha.pa.us>
Subject: Re: [HACKERS] Re: [GENERAL] Re: [GENERAL] Queries across multiple databases ?(was: SELECT from a table in another database).
Message-ID: <20010523095641.D23741@rice.edu>
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In-Reply-To: <200105221131.f4MBVIc28574@candle.pha.pa.us>; from pgman@candle.pha.pa.us on Tue, May 22, 2001 at 07:31:18AM -0400
Status: ORr
Bruce -
Around the first of the year, I started playing around with a schema
implementation. As you may recall, my first crack at changing file storage
names about a year ago was motivated by the need to avoid collisions
once schema were available.
Anyway, now that Vadim has removed a lot of the internal dependence
on relname for keeping track of relations, using the new relfinenode
many places relname used to be used, it seems to me that adding a
parallel schemaname to all the data structures that use relname isn't
as cumbersome as Peter might think. I hadn't tackled the relcache yet:
perhaps concatenating the schemaname and relname to use as the hash key
is the way to go for that.
Unfortunately, all that code is now 4 months old, and on my machine
at home. I has started with the rangetable entries, because hacked the
parser to allow 'SELECT * FROM schemaname.tablename' was easier than
'select schemaname.tablename.fieldname FROM', since the dot function
calling convention isn't allowed in the range list, while it is in the
target list.
I seem to recall tripping up on the query plan printer, of all things,
before other, paying work pushed it aside. I'll see if I can update that
code to the current tree, and send you something, if you'd like.
Ross
On Tue, May 22, 2001 at 07:31:18AM -0400, Bruce Momjian wrote:
> > > I'm not sure whether it is quite the way to do it, but I'd have a better
> > > time with things if I could span databases in a single request. Are
> > > there theoretical problems with spanning databases in a single query? Is
> > > it a feature of bad database design & implementation?
> >
> > I think the developers are planning full schema support for the relatively
> > near future (possibly even 7.2, but check the archives and see what's been
> > said). Although it looks easy to access a table from another database,
> > things can rapidly become more complicated as you start having to deal with
> > transactions, triggers, rules, constraints...
>
> Schema is on my radar screen for 7.2. I am waiting to do some research
> in what needs to be done, but my initial idea is to use the system cache
> to do namespace mapping, just like is done now for temp tables.
>
> --
> Bruce Momjian | http://candle.pha.pa.us
> pgman@candle.pha.pa.us | (610) 853-3000
> + If your life is a hard drive, | 830 Blythe Avenue
> + Christ can be your backup. | Drexel Hill, Pennsylvania 19026
>
> ---------------------------(end of broadcast)---------------------------
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