drop table if exists t1;
select 'a' = 'a', 'a' = 'a ', 'a ' = 'a';
'a' = 'a'	'a' = 'a '	'a ' = 'a'
1	1	1
select 'a\0' = 'a', 'a\0' < 'a', 'a\0' > 'a';
'a\0' = 'a'	'a\0' < 'a'	'a\0' > 'a'
0	1	0
select 'a' = 'a\0', 'a' < 'a\0', 'a' > 'a\0';
'a' = 'a\0'	'a' < 'a\0'	'a' > 'a\0'
0	0	1
select 'a\0' = 'a ', 'a\0' < 'a ', 'a\0' > 'a ';
'a\0' = 'a '	'a\0' < 'a '	'a\0' > 'a '
0	1	0
select 'a ' = 'a\0', 'a ' < 'a\0', 'a ' > 'a\0';
'a ' = 'a\0'	'a ' < 'a\0'	'a ' > 'a\0'
0	0	1
select 'a  a' > 'a', 'a  \0' < 'a';
'a  a' > 'a'	'a  \0' < 'a'
1	1
select binary 'a  a' > 'a', binary 'a  \0' > 'a', binary 'a\0' > 'a';
binary 'a  a' > 'a'	binary 'a  \0' > 'a'	binary 'a\0' > 'a'
1	1	1
create table t1 (text1 varchar(32) not NULL, KEY key1 (text1));
insert into t1 values ('teststring'), ('nothing'), ('teststring\t');
check table t1;
Table	Op	Msg_type	Msg_text
test.t1	check	status	OK
select * from t1 ignore key (key1) where text1='teststring' or 
text1 like 'teststring_%' ORDER BY text1;
text1
teststring	
teststring
select * from t1 where text1='teststring' or text1 like 'teststring_%';
text1
teststring	
teststring
select * from t1 where text1='teststring' or text1 > 'teststring\t';
text1
teststring
select * from t1 order by text1;
text1
nothing
teststring	
teststring
explain select * from t1 order by text1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	index	NULL	key1	34	NULL	3	Using index
alter table t1 modify text1 char(32) binary not null;
check table t1;
Table	Op	Msg_type	Msg_text
test.t1	check	status	OK
select * from t1 ignore key (key1) where text1='teststring' or 
text1 like 'teststring_%' ORDER BY text1;
text1
teststring	
teststring
select concat('|', text1, '|') as c from t1 where text1='teststring' or text1 like 'teststring_%' order by c;
c
|teststring	|
|teststring|
select concat('|', text1, '|') from t1 where text1='teststring' or text1 > 'teststring\t';
concat('|', text1, '|')
|teststring|
select text1, length(text1) from t1 order by text1;
text1	length(text1)
nothing	7
teststring		11
teststring	10
select text1, length(text1) from t1 order by binary text1;
text1	length(text1)
nothing	7
teststring	10
teststring		11
alter table t1 modify text1 blob not null, drop key key1, add key key1 (text1(20));
insert into t1 values ('teststring ');
select concat('|', text1, '|') from t1 order by text1;
concat('|', text1, '|')
|nothing|
|teststring|
|teststring	|
|teststring |
select concat('|', text1, '|') from t1 where text1='teststring' or text1 > 'teststring\t';
concat('|', text1, '|')
|teststring|
|teststring |
select concat('|', text1, '|') from t1 where text1='teststring';
concat('|', text1, '|')
|teststring|
select concat('|', text1, '|') from t1 where text1='teststring ';
concat('|', text1, '|')
|teststring |
alter table t1 modify text1 text not null, pack_keys=1;
select concat('|', text1, '|') from t1 where text1='teststring';
concat('|', text1, '|')
|teststring|
|teststring |
select concat('|', text1, '|') from t1 where text1='teststring ';
concat('|', text1, '|')
|teststring|
|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	ref	key1	key1	22	const	2	Using where
select concat('|', text1, '|') from t1 where text1 like 'teststring_%';
concat('|', text1, '|')
|teststring	|
|teststring |
select concat('|', text1, '|') as c from t1 where text1='teststring' or text1 like 'teststring_%' order by c;
c
|teststring	|
|teststring |
|teststring|
select concat('|', text1, '|') from t1 where text1='teststring' or text1 > 'teststring\t';
concat('|', text1, '|')
|teststring|
|teststring |
select concat('|', text1, '|') from t1 order by text1;
concat('|', text1, '|')
|nothing|
|teststring	|
|teststring|
|teststring |
drop table t1;
create table t1 (text1 varchar(32) not NULL, KEY key1 (text1)) pack_keys=0;
insert into t1 values ('teststring'), ('nothing'), ('teststring\t');
select concat('|', text1, '|') as c from t1 where text1='teststring' or text1 like 'teststring_%' order by c;
c
|teststring	|
|teststring|
select concat('|', text1, '|') from t1 where text1='teststring' or text1 >= 'teststring\t';
concat('|', text1, '|')
|teststring	|
|teststring|
drop table t1;
create table t1 (text1 varchar(32) not NULL, KEY key1 using BTREE (text1)) engine=heap;
insert into t1 values ('teststring'), ('nothing'), ('teststring\t');
select * from t1 ignore key (key1) where text1='teststring' or 
text1 like 'teststring_%' ORDER BY text1;
text1
teststring	
teststring
select * from t1 where text1='teststring' or text1 like 'teststring_%';
text1
teststring	
teststring
select * from t1 where text1='teststring' or text1 >= 'teststring\t';
text1
teststring	
teststring
select * from t1 order by text1;
text1
nothing
teststring	
teststring
explain select * from t1 order by text1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using filesort
alter table t1 modify text1 char(32) binary not null;
select * from t1 order by text1;
text1
nothing
teststring	
teststring
drop table t1;
create table t1 (text1 varchar(32) not NULL, KEY key1 (text1)) engine=innodb;
insert into t1 values ('teststring'), ('nothing'), ('teststring\t');
check table t1;
Table	Op	Msg_type	Msg_text
test.t1	check	status	OK
select * from t1 where text1='teststring' or text1 like 'teststring_%';
text1
teststring	
teststring
select * from t1 where text1='teststring' or text1 > 'teststring\t';
text1
teststring
select * from t1 order by text1;
text1
nothing
teststring	
teststring
explain select * from t1 order by text1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	index	NULL	key1	34	NULL	3	Using index
alter table t1 modify text1 char(32) binary not null;
select * from t1 order by text1;
text1
nothing
teststring	
teststring
alter table t1 modify text1 blob not null, drop key key1, add key key1 (text1(20));
insert into t1 values ('teststring ');
select concat('|', text1, '|') from t1 order by text1;
concat('|', text1, '|')
|nothing|
|teststring|
|teststring	|
|teststring |
alter table t1 modify text1 text not null, pack_keys=1;
select * from t1 where text1 like 'teststring_%';
text1
teststring	
teststring 
select text1, length(text1) from t1 where text1='teststring' or text1 like 'teststring_%';
text1	length(text1)
teststring		11
teststring	10
teststring 	11
select text1, length(text1) from t1 where text1='teststring' or text1 >= 'teststring\t';
text1	length(text1)
teststring		11
teststring	10
teststring 	11
select concat('|', text1, '|') from t1 order by text1;
concat('|', text1, '|')
|nothing|
|teststring	|
|teststring|
|teststring |
drop table t1;