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

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.


mysql-test/r/endspace.result:
  Adjusted results after the fix for bug #25971.
mysql-test/r/innodb.result:
  Adjusted results after the fix for bug #25971.
mysql-test/r/myisam.result:
  Adjusted results after the fix for bug #25971.
mysql-test/r/select.result:
  Added a test case for bug #25971.
mysql-test/r/type_blob.result:
  Adjusted results after the fix for bug #25971.
mysql-test/t/select.test:
  Added a test case for bug #25971.

1 files changed, 148 insertions, 0 deletions

diff --git a/mysql-test/r/select.result b/mysql-test/r/select.result
index f50f4859d48..c3132a1b5f6 100644
--- a/mysql-test/r/select.result
+++ b/mysql-test/r/select.result
@@ -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