user_var.result:

SET @`a b`='hello';

INSERT INTO t1 VALUES(@`a b`);

set @var1= "';aaa";

insert into t1 values (@var1);

SET @var2=char(ascii('a'));

insert into t1 values (@var1),(@var2);

show binlog events from 95;

Log_name	Pos	Event_type	Server_id	End_log_pos	Info

master-bin.000001	95	User var	1	136	@`a b`=_latin1 0x68656C6C6F COLLATE latin1_swedish_ci

master-bin.000001	136	Query	1	222	use `test`; INSERT INTO t1 VALUES(@`a b`)

master-bin.000001	222	User var	1	264	@`var1`=_latin1 0x273B616161 COLLATE latin1_swedish_ci

master-bin.000001	264	Query	1	350	use `test`; insert into t1 values (@var1)

master-bin.000001	264	User var	1	302	@`var2`=_latin1 0x61 COLLATE latin1_swedish_ci

master-bin.000001	302	Query	1	396	use `test`; insert into t1 values (@var1),(@var2)

/*!40019 SET @@session.max_insert_delayed_threads=0*/;

SET @`a b`:=_latin1 0x68656C6C6F COLLATE latin1_swedish_ci;

SET @`a b`:=_latin1 0x68656C6C6F COLLATE `latin1_swedish_ci`;

use test;

SET TIMESTAMP=10000;

SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=1, @@session.unique_checks=1;

SET @@session.sql_mode=0;

INSERT INTO t1 VALUES(@`a b`);

SET @`var1`:=_latin1 0x273B616161 COLLATE latin1_swedish_ci;

SET @`var1`:=_latin1 0x273B616161 COLLATE `latin1_swedish_ci`;

SET @`var2`:=_latin1 0x61 COLLATE `latin1_swedish_ci`;

SET TIMESTAMP=10000;

insert into t1 values (@var1);

insert into t1 values (@var1),(@var2);

drop table t1;

set @var= NULL ;

select FIELD( @var,'1it','Hit') as my_column;