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MDEV-7149 Constant propagation erroneously applied for LIKE

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Simply disallowing equality propagation into LIKE.
A more delicate fix is be possible, but it would need too many changes,
which is not desirable in 10.0 at this point.
This commit is contained in:
Alexander Barkov
2014-11-28 18:11:58 +04:00
parent 74e581b7c4
commit f8e1952be4
13 changed files with 1110 additions and 1 deletions
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39
mysql-test/include/ctype_like_cond_propagation.inc Normal file
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@ -0,0 +1,39 @@
--echo #
--echo # MDEV-7149 Constant condition propagation erroneously applied for LIKE
--echo #
CREATE TABLE t1 AS SELECT REPEAT('a', 10) AS c1 LIMIT 0;
SHOW CREATE TABLE t1;
INSERT INTO t1 VALUES ('a'),('a ');
SELECT * FROM t1 WHERE CONCAT(c1)='a';
SELECT * FROM t1 WHERE CONCAT(c1) LIKE 'a ';
SELECT * FROM t1 WHERE CONCAT(c1)='a' AND CONCAT(c1) LIKE 'a ';
EXPLAIN EXTENDED SELECT * FROM t1 WHERE CONCAT(c1)='a' AND CONCAT(c1) LIKE 'a ';
DROP TABLE t1;
CREATE TABLE t1 AS SELECT REPEAT('a', 10) AS c1 LIMIT 0;
SHOW CREATE TABLE t1;
INSERT INTO t1 VALUES ('a'),('a ');
SELECT * FROM t1 WHERE 'a'=CONCAT(c1);
SELECT * FROM t1 WHERE 'a ' LIKE CONCAT(c1);
SELECT * FROM t1 WHERE 'a'=CONCAT(c1) AND 'a ' LIKE CONCAT(c1);
EXPLAIN EXTENDED SELECT * FROM t1 WHERE 'a'=CONCAT(c1) AND 'a ' LIKE CONCAT(c1);
DROP TABLE t1;
CREATE TABLE t1 AS SELECT REPEAT('a', 10) AS c1 LIMIT 0;
SHOW CREATE TABLE t1;
INSERT INTO t1 VALUES ('%'),('% ');
SELECT * FROM t1 WHERE '% '=CONCAT(c1);
SELECT * FROM t1 WHERE 'a' LIKE CONCAT(c1);
SELECT * FROM t1 WHERE '% '=CONCAT(c1) AND 'a' LIKE CONCAT(c1);
EXPLAIN EXTENDED SELECT * FROM t1 WHERE '% '=CONCAT(c1) AND 'a' LIKE CONCAT(c1);
DROP TABLE t1;
CREATE TABLE t1 AS SELECT REPEAT('a', 10) AS c1 LIMIT 0;
SHOW CREATE TABLE t1;
INSERT INTO t1 VALUES ('%'),('% ');
SELECT * FROM t1 WHERE '%'=CONCAT(c1);
SELECT * FROM t1 WHERE 'a' LIKE CONCAT(c1);
SELECT * FROM t1 WHERE '%'=CONCAT(c1) AND 'a' LIKE CONCAT(c1);
EXPLAIN EXTENDED SELECT * FROM t1 WHERE '%'=CONCAT(c1) AND 'a' LIKE CONCAT(c1);
DROP TABLE t1;

16
mysql-test/include/ctype_like_cond_propagation_utf8_german.inc Normal file
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--echo #
--echo # MDEV-7149 Constant condition propagation erroneously applied for LIKE
--echo #
CREATE TABLE t1 AS SELECT REPEAT('a',10) AS c1 LIMIT 0;
SHOW CREATE TABLE t1;
INSERT INTO t1 VALUES ('ae'),('ä');
SELECT * FROM t1 WHERE c1='ä';
SELECT * FROM t1 WHERE c1 LIKE 'ae';
SELECT * FROM t1 WHERE c1='ä' AND c1 LIKE 'ae';
EXPLAIN EXTENDED SELECT * FROM t1 WHERE c1='ä' AND c1 LIKE 'ae';
SELECT * FROM t1 WHERE CONCAT(c1)='ä';
SELECT * FROM t1 WHERE CONCAT(c1) LIKE 'ae';
SELECT * FROM t1 WHERE CONCAT(c1)='ä' AND CONCAT(c1) LIKE 'ae';
EXPLAIN EXTENDED SELECT * FROM t1 WHERE CONCAT(c1)='ä' AND CONCAT(c1) LIKE 'ae';
DROP TABLE IF EXISTS t1;