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Update TODO list.
This commit is contained in:
Bruce Momjian
@ -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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Content-Type: multipart/mixed; boundary="------------8DF2D5BA86BB12328C66DD16"
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Status: ROr
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This is a multi-part message in MIME format.
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--------------8DF2D5BA86BB12328C66DD16
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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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w81OllbetPuDSJW7thnJmgVZ39Cpgspm/XV03R/X6+7daPTP7bpbC9vWWkPXt0eoNjtsl9X+
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||||||
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C9S3fTHkh4oM1D5e5D92ZSdajdFYuSAT6JBfup3AWkSRocmqObk7VQaV+uStIcEX4lrpEpKF
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qS8ohjI73rXvkN70XH03UKaRoTh7QN+he00/fBzP3AlNkL7Lo4iAaBVS+b6CxW54Ap6bH392
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bystJVnwzgNWIli0YMk6BkjLRQyyIBentOqAd8KtBDiWixwLUyzmioZjgqB04V79vvSNSe9H
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||||||
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vg8wmtxrgADovR0AjWpbc1QTrdtN94HHaTcI0JA950FbDnSyWw4XS1sOcE/YcmgPnC7GkuYl
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||||||
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fBL4drU3ot3EzWlFUIODbX/XxpEb5mPf8NidEodo8WwL56iKiCbOce10hkzGH0G1gEiprIMm
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||||||
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||||||
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3qYDjPzJtv0A7tB23qN7PLKfg7kDfMugFEomEmo8UzOJwdFMXUaNZfoibjJmHIPF/LN0DESf
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||||||
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JTX6Lo7BImi+uBjPF/ZlvCVK2lc31Wp1XO6r5m5zpv8TtyX+eg9qS/AOD2pL6syjZJf6JExd
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||||||
|
2IjKTq/12cwm1u8DEJ2JOdV1F+l8qw4DABeYScsjuUAvJT25C9CouJqO51eW7CXRsmsGDVvu
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||||||
|
2q0PEj3D+2+Kyxzar+tjXspzcY3zpkvN6j+/EUTeQ1oMxUFWk8mnjS79v9Om6YuQSNJu05H0
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||||||
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frUTknX3Th4U+vfvv44u3s/fCxtNPZ+9oFIdLA7/kv7sv4PRQ5lBwNzulWTUU2uE6n4di99z
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|
||||||
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jYzTE+P1HcYJfYRoySlyhGjJSWfUVU83uOTEKEIUPczUX7TAGt6uemgl+JqHvZ77teyEJCQe
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|
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|
MY/Vx1yNU75zFdR2xAdHloDL6lHiQ/aKNHPMoOpRsh0hdt337gF6qYAZ+s5Kd2sFwe6QDxPl
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/wOU7Ogc2/cAAA==
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--------------8DF2D5BA86BB12328C66DD16--
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|
|||||||
@ -311,3 +311,82 @@ structure...
|
|||||||
|
|
||||||
- Tom
|
- 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
|
||||||
|
|
||||||
|
|
||||||
|
|||||||
Reference in New Issue
Block a user