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Fix a vdbe stack leak that could occur where one side of a WHERE clause inequality evaluated to SQL null. (CVS 4045)

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FossilOrigin-Name: 17152bf1a268e130f0c43046bb438b617a747ff5
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danielk1977
2007-06-02 07:54:37 +00:00
parent 9afe689ea4
commit 39984cdc8b
4 changed files with 43 additions and 11 deletions
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34
test/where4.test
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@ -15,7 +15,7 @@
# that IS NULL phrases are correctly optimized. But you can never
# have too many tests, so some other tests are thrown in as well.
#
# $Id: where4.test,v 1.3 2007/03/28 14:30:09 drh Exp $
# $Id: where4.test,v 1.4 2007/06/02 07:54:38 danielk1977 Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
@ -230,4 +230,36 @@ do_test where4-7.1 {
integrity_check {where4-99.0}
do_test where4-7.1 {
execsql {
BEGIN;
CREATE TABLE t8(a, b, c, d);
CREATE INDEX t8_i ON t8(a, b, c);
CREATE TABLE t7(i);
INSERT INTO t7 VALUES(1);
INSERT INTO t7 SELECT i*2 FROM t7;
INSERT INTO t7 SELECT i*2 FROM t7;
INSERT INTO t7 SELECT i*2 FROM t7;
INSERT INTO t7 SELECT i*2 FROM t7;
INSERT INTO t7 SELECT i*2 FROM t7;
INSERT INTO t7 SELECT i*2 FROM t7;
COMMIT;
}
} {}
# At one point the sub-select inside the aggregate sum() function in the
# following query was leaking a couple of stack entries. This query
# runs the SELECT in a loop enough times that an assert() fails. Or rather,
# did fail before the bug was fixed.
#
do_test where4-7.2 {
execsql {
SELECT sum((
SELECT d FROM t8 WHERE a = i AND b = i AND c < NULL
)) FROM t7;
}
} {{}}
finish_test