From ad791c1d140af97d93ee98883e2c45413d6f9836 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Thu, 23 Sep 1999 22:14:01 +0000
Subject: [PATCH] Update TODO list.

---
 doc/TODO.detail/alpha | 210 ++++++++++++++++++++++++++++++++++++++++++
 doc/TODO.detail/outer |  79 ++++++++++++++++
 2 files changed, 289 insertions(+)

diff --git a/doc/TODO.detail/alpha b/doc/TODO.detail/alpha
index e30a969ee2..76c352760d 100644
--- a/doc/TODO.detail/alpha
+++ b/doc/TODO.detail/alpha
@@ -105,3 +105,213 @@ Univ. of Cincinnati College of Medicine                    fax: (513) 558-8474
 
 
 
+From gatgul@voicenet.com Thu Jul 22 21:58:42 1999
+Received: from voicenet.com (mail12.voicenet.com [207.103.0.6])
+	by candle.pha.pa.us (8.9.0/8.9.0) with SMTP id VAA20482
+	for <maillist@candle.pha.pa.us>; Thu, 22 Jul 1999 21:58:39 -0400 (EDT)
+Received: (qmail 17312 invoked from network); 23 Jul 1999 01:58:33 -0000
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+  by mail12.voicenet.com with SMTP; 23 Jul 1999 01:58:33 -0000
+Sender: gat
+Message-ID: <3797CB70.7554322B@voicenet.com>
+Date: Thu, 22 Jul 1999 21:54:56 -0400
+From: Uncle George <gatgul@voicenet.com>
+Organization: Big Endian
+X-Mailer: Mozilla 4.07 [en] (X11; I; Linux 2.0.36 i686)
+MIME-Version: 1.0
+To: Bruce Momjian <maillist@candle.pha.pa.us>
+Subject: Re: [PORTS] RedHat6.0 & Alpha
+References: <199907221830.OAA06403@candle.pha.pa.us>
+Content-Type: multipart/mixed; boundary="------------8DF2D5BA86BB12328C66DD16"
+Status: ROr
+
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+--------------8DF2D5BA86BB12328C66DD16
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+
+Bruce Momjian wrote:
+
+>
+> Can I now put back optimization to -O2 on alpha?  Please send me your
+> other diffs.
+>
+
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+--------------8DF2D5BA86BB12328C66DD16--
+
+
+
diff --git a/doc/TODO.detail/outer b/doc/TODO.detail/outer
index 584801eba1..99eab30d36 100644
--- a/doc/TODO.detail/outer
+++ b/doc/TODO.detail/outer
@@ -311,3 +311,82 @@ structure...
 
                          - Tom
 
+From owner-pgsql-hackers@hub.org Wed Jul 21 02:35:13 1999
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+Message-ID: <379566A6.A4CDF97F@alumni.caltech.edu>
+Date: Wed, 21 Jul 1999 06:20:22 +0000
+From: Thomas Lockhart <lockhart@alumni.caltech.edu>
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+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>
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+
+> 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
+
+
-- 
2.24.1