Update TODO list.
This commit is contained in:
Bruce Momjian
parent
36453816db
commit
ad791c1d14
@ -105,3 +105,213 @@ Univ. of Cincinnati College of Medicine fax: (513) 558-8474
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From gatgul@voicenet.com Thu Jul 22 21:58:42 1999
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Received: from voicenet.com (mail12.voicenet.com [207.103.0.6])
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by candle.pha.pa.us (8.9.0/8.9.0) with SMTP id VAA20482
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for <maillist@candle.pha.pa.us>; Thu, 22 Jul 1999 21:58:39 -0400 (EDT)
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Received: (qmail 17312 invoked from network); 23 Jul 1999 01:58:33 -0000
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Received: from dialpool1745.voicenet.com (HELO voicenet.com) (209.71.57.45)
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by mail12.voicenet.com with SMTP; 23 Jul 1999 01:58:33 -0000
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Sender: gat
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Message-ID: <3797CB70.7554322B@voicenet.com>
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Date: Thu, 22 Jul 1999 21:54:56 -0400
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From: Uncle George <gatgul@voicenet.com>
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Organization: Big Endian
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X-Mailer: Mozilla 4.07 [en] (X11; I; Linux 2.0.36 i686)
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MIME-Version: 1.0
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To: Bruce Momjian <maillist@candle.pha.pa.us>
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Subject: Re: [PORTS] RedHat6.0 & Alpha
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References: <199907221830.OAA06403@candle.pha.pa.us>
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Status: ROr
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This is a multi-part message in MIME format.
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Content-Type: text/plain; charset=us-ascii
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Content-Transfer-Encoding: 7bit
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Bruce Momjian wrote:
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>
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> Can I now put back optimization to -O2 on alpha? Please send me your
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> other diffs.
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>
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||||
--------------8DF2D5BA86BB12328C66DD16--
|
||||
|
||||
|
||||
|
||||
|
||||
@ -311,3 +311,82 @@ structure...
|
||||
|
||||
- Tom
|
||||
|
||||
From owner-pgsql-hackers@hub.org Wed Jul 21 02:35:13 1999
|
||||
Received: from hub.org (hub.org [216.126.84.1])
|
||||
by candle.pha.pa.us (8.9.0/8.9.0) with ESMTP id CAA13837
|
||||
for <maillist@candle.pha.pa.us>; Wed, 21 Jul 1999 02:35:12 -0400 (EDT)
|
||||
Received: from hub.org (hub.org [216.126.84.1])
|
||||
by hub.org (8.9.3/8.9.3) with ESMTP id CAA88539;
|
||||
Wed, 21 Jul 1999 02:27:41 -0400 (EDT)
|
||||
(envelope-from owner-pgsql-hackers@hub.org)
|
||||
Received: by hub.org (TLB v0.10a (1.23 tibbs 1997/01/09 00:29:32)); Wed, 21 Jul 1999 02:24:08 +0000 (EDT)
|
||||
Received: (from majordom@localhost)
|
||||
by hub.org (8.9.3/8.9.3) id CAA87850
|
||||
for pgsql-hackers-outgoing; Wed, 21 Jul 1999 02:23:13 -0400 (EDT)
|
||||
(envelope-from owner-pgsql-hackers@postgreSQL.org)
|
||||
Received: from localhost (IDENT:root@hectic-2.jpl.nasa.gov [128.149.68.204])
|
||||
by hub.org (8.9.3/8.9.3) with ESMTP id CAA87810
|
||||
for <pgsql-hackers@postgreSQL.org>; Wed, 21 Jul 1999 02:22:52 -0400 (EDT)
|
||||
(envelope-from lockhart@alumni.caltech.edu)
|
||||
Received: from alumni.caltech.edu (lockhart@localhost [127.0.0.1])
|
||||
by localhost (8.8.7/8.8.7) with ESMTP id GAA14480;
|
||||
Wed, 21 Jul 1999 06:20:22 GMT
|
||||
Message-ID: <379566A6.A4CDF97F@alumni.caltech.edu>
|
||||
Date: Wed, 21 Jul 1999 06:20:22 +0000
|
||||
From: Thomas Lockhart <lockhart@alumni.caltech.edu>
|
||||
X-Mailer: Mozilla 4.6 [en] (X11; I; Linux 2.0.36 i686)
|
||||
X-Accept-Language: en
|
||||
MIME-Version: 1.0
|
||||
To: Tom Lane <tgl@sss.pgh.pa.us>
|
||||
CC: Bruce Momjian <maillist@candle.pha.pa.us>, pgsql-hackers@postgreSQL.org
|
||||
Subject: Re: [HACKERS] Another reason to redesign querytree representation
|
||||
References: <591.932505751@sss.pgh.pa.us>
|
||||
Content-Type: text/plain; charset=us-ascii
|
||||
Content-Transfer-Encoding: 7bit
|
||||
Sender: owner-pgsql-hackers@postgreSQL.org
|
||||
Precedence: bulk
|
||||
Status: RO
|
||||
|
||||
> Thomas, what do you think is needed for outer joins?
|
||||
|
||||
Bruce and I have talked about it some already:
|
||||
|
||||
For outer joins, tables must be combined in a particular order. For
|
||||
example, a left outer join requires that any entries in the left-side
|
||||
table which do not have a corresponding entry in the right-side table
|
||||
be expanded with nulls during the join. The information on the outer
|
||||
join can't be carried by the rte since the same table can appear twice
|
||||
in an outer join expression:
|
||||
|
||||
select * from t1 left join t2 using (i)
|
||||
left join t1 on (i = t1.j);
|
||||
|
||||
For a query like
|
||||
|
||||
select * from t1 left join t2 using (i) where t2.j = 3;
|
||||
|
||||
istm that the outer join must be done before the t2 qualification is
|
||||
applied, and that another ordering may produce the wrong result.
|
||||
|
||||
>From what I understand Bruce to say, the planner/optimizer is allowed
|
||||
to try all kinds of permutations of plans, choosing the one with the
|
||||
lowest cost. But if the info for the join is carried in a
|
||||
qualification node, then the planner/optimizer must know that it can't
|
||||
reorder the query as freely as it does now.
|
||||
|
||||
I was thinking of having a new qualification node to carry this info,
|
||||
and it could be transformed into a mergejoin node which has a couple
|
||||
of new fields indicating left and/or right outer join behavior.
|
||||
|
||||
A hashjoin method may be possible for queries which are structured as
|
||||
a left outer join; other outer joins will need to use the mergejoin
|
||||
method. Also, some poorly-qualified outer joins reduce to inner joins,
|
||||
and perhaps the optimizer can be smart enough to realize this.
|
||||
|
||||
- Thomas
|
||||
|
||||
--
|
||||
Thomas Lockhart lockhart@alumni.caltech.edu
|
||||
South Pasadena, California
|
||||
|
||||
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user