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Fixed bug #25971: indexes on text columns were ignored when ref accesses

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were evaluated.
According to the new rules for string comparison partial indexes on text
columns can be used in the same cases when partial indexes on varchar
columns can be used.
This commit is contained in:
igor@olga.mysql.com
2007-02-14 22:06:41 -08:00
parent c84ee7079c
commit a2d4a042d0
7 changed files with 200 additions and 12 deletions
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2
mysql-test/r/endspace.result
View File

@ -98,7 +98,7 @@ concat('|', text1, '|')
|teststring |
explain select concat('|', text1, '|') from t1 where text1='teststring ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range key1 key1 22 NULL 2 Using where
1 SIMPLE t1 ref key1 key1 22 const 2 Using where
select concat('|', text1, '|') from t1 where text1 like 'teststring_%';
concat('|', text1, '|')
|teststring |

2
mysql-test/r/innodb.result
View File

@ -1991,7 +1991,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref c c 11 const # Using where; Using index
explain select count(*) from t1 where t='a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range t t 13 NULL # Using where
1 SIMPLE t1 ref t t 13 const # Using where
explain select count(*) from t1 where v like 'a%';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range v v 13 NULL # Using where; Using index

2
mysql-test/r/myisam.result
View File

@ -1071,7 +1071,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref c c 11 const # Using where; Using index
explain select count(*) from t1 where t='a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range t t 13 NULL # Using where
1 SIMPLE t1 ref t t 13 const # Using where
explain select count(*) from t1 where v like 'a%';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range v v 13 NULL # Using where; Using index

148
mysql-test/r/select.result
View File

@ -3785,4 +3785,152 @@ case when 1 then cast(1111111111111111111 as unsigned) else 1 end c,
coalesce(cast(1111111111111111111 as unsigned), 1) co;
i c co
1111111111111111111 1111111111111111111 1111111111111111111
CREATE TABLE t1 (name varchar(255));
CREATE TABLE t2 (name varchar(255), n int, KEY (name(3)));
INSERT INTO t1 VALUES ('ccc'), ('bb'), ('cc '), ('aa '), ('aa');
INSERT INTO t2 VALUES ('bb',1), ('aa',2), ('cc ',3);
INSERT INTO t2 VALUES (concat('cc ', 0x06), 4);
INSERT INTO t2 VALUES ('cc',5), ('bb ',6), ('cc ',7);
SELECT * FROM t2;
name n
bb 1
aa 2
cc 3
cc  4
cc 5
bb 6
cc 7
SELECT * FROM t2 ORDER BY name;
name n
aa 2
bb 1
bb 6
cc  4
cc 3
cc 5
cc 7
SELECT name, LENGTH(name), n FROM t2 ORDER BY name;
name LENGTH(name) n
aa 2 2
bb 2 1
bb 3 6
cc  4 4
cc 5 3
cc 2 5
cc 3 7
EXPLAIN SELECT name, LENGTH(name), n FROM t2 WHERE name='cc ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ref name name 6 const 3 Using where
SELECT name, LENGTH(name), n FROM t2 WHERE name='cc ';
name LENGTH(name) n
cc 5 3
cc 2 5
cc 3 7
EXPLAIN SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range name name 6 NULL 3 Using where
SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%';
name LENGTH(name) n
cc 5 3
cc  4 4
cc 2 5
cc 3 7
EXPLAIN SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%' ORDER BY name;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range name name 6 NULL 3 Using where; Using filesort
SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%' ORDER BY name;
name LENGTH(name) n
cc  4 4
cc 5 3
cc 2 5
cc 3 7
EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON t1.name=t2.name;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 5
1 SIMPLE t2 ref name name 6 test.t1.name 2
SELECT * FROM t1 LEFT JOIN t2 ON t1.name=t2.name;
name name n
ccc NULL NULL
bb bb 1
bb bb 6
cc cc 3
cc cc 5
cc cc 7
aa aa 2
aa aa 2
DROP TABLE t1,t2;
CREATE TABLE t1 (name text);
CREATE TABLE t2 (name text, n int, KEY (name(3)));
INSERT INTO t1 VALUES ('ccc'), ('bb'), ('cc '), ('aa '), ('aa');
INSERT INTO t2 VALUES ('bb',1), ('aa',2), ('cc ',3);
INSERT INTO t2 VALUES (concat('cc ', 0x06), 4);
INSERT INTO t2 VALUES ('cc',5), ('bb ',6), ('cc ',7);
SELECT * FROM t2;
name n
bb 1
aa 2
cc 3
cc  4
cc 5
bb 6
cc 7
SELECT * FROM t2 ORDER BY name;
name n
aa 2
bb 1
bb 6
cc  4
cc 3
cc 5
cc 7
SELECT name, LENGTH(name), n FROM t2 ORDER BY name;
name LENGTH(name) n
aa 2 2
bb 2 1
bb 3 6
cc  4 4
cc 5 3
cc 2 5
cc 3 7
EXPLAIN SELECT name, LENGTH(name), n FROM t2 WHERE name='cc ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ref name name 6 const 3 Using where
SELECT name, LENGTH(name), n FROM t2 WHERE name='cc ';
name LENGTH(name) n
cc 5 3
cc 2 5
cc 3 7
EXPLAIN SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range name name 6 NULL 3 Using where
SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%';
name LENGTH(name) n
cc 5 3
cc  4 4
cc 2 5
cc 3 7
EXPLAIN SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%' ORDER BY name;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range name name 6 NULL 3 Using where; Using filesort
SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%' ORDER BY name;
name LENGTH(name) n
cc  4 4
cc 5 3
cc 2 5
cc 3 7
EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON t1.name=t2.name;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 5
1 SIMPLE t2 ref name name 6 test.t1.name 2
SELECT * FROM t1 LEFT JOIN t2 ON t1.name=t2.name;
name name n
ccc NULL NULL
bb bb 1
bb bb 6
cc cc 3
cc cc 5
cc cc 7
aa aa 2
aa aa 2
DROP TABLE t1,t2;
End of 5.0 tests

4
mysql-test/r/type_blob.result
View File

@ -610,12 +610,12 @@ create table t1 (id integer primary key auto_increment, txt text, index txt_inde
insert into t1 (txt) values ('Chevy'), ('Chevy '), (NULL);
select * from t1 where txt='Chevy' or txt is NULL;
id txt
3 NULL
1 Chevy
2 Chevy
3 NULL
explain select * from t1 where txt='Chevy' or txt is NULL;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range txt_index txt_index 23 NULL 2 Using where
1 SIMPLE t1 ref_or_null txt_index txt_index 23 const 2 Using where
select * from t1 where txt='Chevy ';
id txt
1 Chevy

46
mysql-test/t/select.test
View File

@ -3253,4 +3253,50 @@ select
case when 1 then cast(1111111111111111111 as unsigned) else 1 end c,
coalesce(cast(1111111111111111111 as unsigned), 1) co;
#
# Bug #22971: indexes on text columns are ignored for ref accesses
#
CREATE TABLE t1 (name varchar(255));
CREATE TABLE t2 (name varchar(255), n int, KEY (name(3)));
INSERT INTO t1 VALUES ('ccc'), ('bb'), ('cc '), ('aa '), ('aa');
INSERT INTO t2 VALUES ('bb',1), ('aa',2), ('cc ',3);
INSERT INTO t2 VALUES (concat('cc ', 0x06), 4);
INSERT INTO t2 VALUES ('cc',5), ('bb ',6), ('cc ',7);
SELECT * FROM t2;
SELECT * FROM t2 ORDER BY name;
SELECT name, LENGTH(name), n FROM t2 ORDER BY name;
EXPLAIN SELECT name, LENGTH(name), n FROM t2 WHERE name='cc ';
SELECT name, LENGTH(name), n FROM t2 WHERE name='cc ';
EXPLAIN SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%';
SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%';
EXPLAIN SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%' ORDER BY name;
SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%' ORDER BY name;
EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON t1.name=t2.name;
SELECT * FROM t1 LEFT JOIN t2 ON t1.name=t2.name;
DROP TABLE t1,t2;
CREATE TABLE t1 (name text);
CREATE TABLE t2 (name text, n int, KEY (name(3)));
INSERT INTO t1 VALUES ('ccc'), ('bb'), ('cc '), ('aa '), ('aa');
INSERT INTO t2 VALUES ('bb',1), ('aa',2), ('cc ',3);
INSERT INTO t2 VALUES (concat('cc ', 0x06), 4);
INSERT INTO t2 VALUES ('cc',5), ('bb ',6), ('cc ',7);
SELECT * FROM t2;
SELECT * FROM t2 ORDER BY name;
SELECT name, LENGTH(name), n FROM t2 ORDER BY name;
EXPLAIN SELECT name, LENGTH(name), n FROM t2 WHERE name='cc ';
SELECT name, LENGTH(name), n FROM t2 WHERE name='cc ';
EXPLAIN SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%';
SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%';
EXPLAIN SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%' ORDER BY name;
SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%' ORDER BY name;
EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON t1.name=t2.name;
SELECT * FROM t1 LEFT JOIN t2 ON t1.name=t2.name;
DROP TABLE t1,t2;
--echo End of 5.0 tests