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In joins of the form "A left B, C" make sure they are not transformed into

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"A left C, B".  Ticket #1830.  See also #1652. (CVS 3203)

FossilOrigin-Name: 2baa983653796e16d36739e37b0be1672bf59a92
This commit is contained in:
drh
2006-06-06 11:45:54 +00:00
parent 59e63a6b30
commit df26fd5edd
4 changed files with 48 additions and 16 deletions
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34
test/where3.test
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@@ -12,7 +12,7 @@
# focus of this file is testing the join reordering optimization
# in cases that include a LEFT JOIN.
#
# $Id: where3.test,v 1.1 2006/02/01 02:45:02 drh Exp $
# $Id: where3.test,v 1.2 2006/06/06 11:45:55 drh Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
@@ -45,5 +45,37 @@ do_test where3-1.1 {
}
} {222 two 2 222 {} {}}
# Ticket #1830
#
# This is similar to the above but with the LEFT JOIN on the
# other side.
#
do_test where3-1.2 {
execsql {
CREATE TABLE parent1(parent1key, child1key, Child2key, child3key);
CREATE TABLE child1 ( child1key NVARCHAR, value NVARCHAR );
CREATE UNIQUE INDEX PKIDXChild1 ON child1 ( child1key );
CREATE TABLE child2 ( child2key NVARCHAR, value NVARCHAR );
INSERT INTO parent1(parent1key,child1key,child2key)
VALUES ( 1, 'C1.1', 'C2.1' );
INSERT INTO child1 ( child1key, value ) VALUES ( 'C1.1', 'Value for C1.1' );
INSERT INTO child2 ( child2key, value ) VALUES ( 'C2.1', 'Value for C2.1' );
INSERT INTO parent1 ( parent1key, child1key, child2key )
VALUES ( 2, 'C1.2', 'C2.2' );
INSERT INTO child2 ( child2key, value ) VALUES ( 'C2.2', 'Value for C2.2' );
INSERT INTO parent1 ( parent1key, child1key, child2key )
VALUES ( 3, 'C1.3', 'C2.3' );
INSERT INTO child1 ( child1key, value ) VALUES ( 'C1.3', 'Value for C1.3' );
INSERT INTO child2 ( child2key, value ) VALUES ( 'C2.3', 'Value for C2.3' );
SELECT parent1.parent1key, child1.value, child2.value
FROM parent1
LEFT OUTER JOIN child1 ON child1.child1key = parent1.child1key
INNER JOIN child2 ON child2.child2key = parent1.child2key;
}
} {1 {Value for C1.1} {Value for C2.1} 2 {} {Value for C2.2} 3 {Value for C1.3} {Value for C2.3}}
finish_test