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# 2007 Sep 12
#
# The author disclaims copyright to this source code. In place of
# a legal notice, here is a blessing:
#
# May you do good and not evil.
# May you find forgiveness for yourself and forgive others.
# May you share freely, never taking more than you give.
#
#***********************************************************************
#
# This file is to test that ticket #2640 has been fixed.
#
# $Id: tkt2640.test,v 1.3 2008/08/04 03:51:24 danielk1977 Exp $
#
# The problem in ticket #2640 was that the query optimizer was
# not recognizing all uses of tables within subqueries in the
# WHERE clause. If the subquery contained a compound SELECT,
# then tables that were used by terms of the compound other than
# the last term would not be recognized as dependencies.
# So if one of the SELECT statements within a compound made
# use of a table that occurs later in a join, the query
# optimizer would not recognize this and would try to evaluate
# the subquery too early, before that tables value had been
# established.
set testdir [file dirname $argv0]
source $testdir/tester.tcl
ifcapable !subquery||!compound {
finish_test
return
}
do_test tkt2640-1.1 {
execsql {
CREATE TABLE persons(person_id, name);
INSERT INTO persons VALUES(1,'fred');
INSERT INTO persons VALUES(2,'barney');
INSERT INTO persons VALUES(3,'wilma');
INSERT INTO persons VALUES(4,'pebbles');
INSERT INTO persons VALUES(5,'bambam');
CREATE TABLE directors(person_id);
INSERT INTO directors VALUES(5);
INSERT INTO directors VALUES(3);
CREATE TABLE writers(person_id);
INSERT INTO writers VALUES(2);
INSERT INTO writers VALUES(3);
INSERT INTO writers VALUES(4);
SELECT DISTINCT p.name
FROM persons p, directors d
WHERE d.person_id=p.person_id
AND NOT EXISTS (
SELECT person_id FROM directors d1 WHERE d1.person_id=p.person_id
EXCEPT
SELECT person_id FROM writers w
);
}
} {wilma}
do_test tkt2640-1.2 {
execsql {
SELECT DISTINCT p.name
FROM persons p CROSS JOIN directors d
WHERE d.person_id=p.person_id
AND NOT EXISTS (
SELECT person_id FROM directors d1 WHERE d1.person_id=p.person_id
EXCEPT
SELECT person_id FROM writers w
);
}
} {wilma}
do_test tkt2640-1.3 {
execsql {
SELECT DISTINCT p.name
FROM directors d CROSS JOIN persons p
WHERE d.person_id=p.person_id
AND NOT EXISTS (
SELECT person_id FROM directors d1 WHERE d1.person_id=p.person_id
EXCEPT
SELECT person_id FROM writers w
);
}
} {wilma}
do_test tkt2640-1.4 {
execsql {
SELECT DISTINCT p.name
FROM persons p, directors d
WHERE d.person_id=p.person_id
AND NOT EXISTS (
SELECT person_id FROM directors d1 WHERE d1.person_id=d.person_id
EXCEPT
SELECT person_id FROM writers w
);
}
} {wilma}
do_test tkt2640-1.5 {
execsql {
SELECT DISTINCT p.name
FROM persons p CROSS JOIN directors d
WHERE d.person_id=p.person_id
AND NOT EXISTS (
SELECT person_id FROM directors d1 WHERE d1.person_id=d.person_id
EXCEPT
SELECT person_id FROM writers w
);
}
} {wilma}
do_test tkt2640-1.6 {
execsql {
SELECT DISTINCT p.name
FROM directors d CROSS JOIN persons p
WHERE d.person_id=p.person_id
AND NOT EXISTS (
SELECT person_id FROM directors d1 WHERE d1.person_id=d.person_id
EXCEPT
SELECT person_id FROM writers w
);
}
} {wilma}
finish_test
|
