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Bug#37548: result value erronously reported being NULL in certain subqueries

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When switching to indexed ORDER BY we must be sure to reset the index read
flag if we are switching from a covering index to non-covering.

mysql-test/r/subselect.result:
  Bug#37548: test case
mysql-test/t/subselect.test:
  Bug#37548: test case
sql/sql_select.cc:
  Bug#37548: update the index read flag if the index for indexed ORDER BY is not
      covering.
This commit is contained in:
Georgi Kodinov 2008-08-27 18:19:22 +03:00
commit cab267ecc7
3 changed files with 93 additions and 0 deletions
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44
mysql-test/t/subselect.test
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@ -3273,3 +3273,47 @@ INSERT INTO t1 VALUES ('a');
SELECT * FROM t1 WHERE _utf8'a' = ANY (SELECT s1 FROM t1);
DROP TABLE t1;
#
# Bug #37548: result value erronously reported being NULL in certain subqueries
#
CREATE TABLE t1 (a int, b int, PRIMARY KEY (a), KEY b (b));
INSERT INTO t1 VALUES (1,NULL), (9,NULL);
CREATE TABLE t2 (
a int,
b int,
c int,
d int,
PRIMARY KEY (a),
UNIQUE KEY b (b,c,d),
KEY b_2 (b),
KEY c (c),
KEY d (d)
);
INSERT INTO t2 VALUES
(43, 2, 11 ,30),
(44, 2, 12 ,30),
(45, 1, 1 ,10000),
(46, 1, 2 ,10000),
(556,1, 32 ,10000);
CREATE TABLE t3 (
a int,
b int,
c int,
PRIMARY KEY (a),
UNIQUE KEY b (b,c),
KEY c (c),
KEY b_2 (b)
);
INSERT INTO t3 VALUES (1,1,1), (2,32,1);
explain
SELECT t1.a, (SELECT 1 FROM t2 WHERE t2.b=t3.c AND t2.c=t1.a ORDER BY t2.d LIMIT 1) AS incorrect FROM t1, t3 WHERE t3.b=t1.a;
SELECT t1.a, (SELECT 1 FROM t2 WHERE t2.b=t3.c AND t2.c=t1.a ORDER BY t2.d LIMIT 1) AS incorrect FROM t1, t3 WHERE t3.b=t1.a;
DROP TABLE t1,t2,t3;