Fix fullstack test

Signed-off-by: JaySon-Huang <[email protected]>

tests/fullstack-test2/ddl/alter_pk.test

@@ -46,16 +46,16 @@ mysql> alter table test.t drop primary key;
 
 # issue 5859, case 1
 mysql> drop table if exists test.t_case;
-## create table with `source` is nullable
-## insert some data and left `source` to be empty
-mysql> create table test.t_case (`case_no` varchar(32) not null,`source` varchar(20) default null,`p` varchar(12) DEFAULT NULL,primary key (`case_no`));
+## create table with source is nullable
+## insert some data and left source to be empty
+mysql> create table test.t_case (case_no varchar(32) not null,source varchar(20) default null,p varchar(12) DEFAULT NULL,primary key (case_no));
 mysql> insert into test.t_case(case_no) values ("1"), ("2"), ("3"), ("4");
 
-## drop the primary key, fill the `source` to be non-empty
+## drop the primary key, fill the source to be non-empty
 ## add new primary key with case_no and source
 mysql> alter table test.t_case drop primary key;
-mysql> update test.t_case set `source` = '' where `source` is NULL;
-mysql> alter table test.t_case add primary key (`case_no`, `source`);
+mysql> update test.t_case set source = '' where source is NULL;
+mysql> alter table test.t_case add primary key (case_no, source);
 
 ## send the snapshot data to tiflash
 mysql> alter table test.t_case set tiflash replica 1;
@@ -73,14 +73,14 @@ mysql> select case_no,p,source from test.t_case;
 
 # issue 5859, case 2
 mysql> drop table if exists test.t_case;
-## create table with `case_no`
-mysql> create table test.t_case (`case_no` varchar(32) not null,`p` varchar(12) DEFAULT NULL,primary key (`case_no`));
+## create table with case_no
+mysql> create table test.t_case (case_no varchar(32) not null,p varchar(12) DEFAULT NULL,primary key (case_no));
 mysql> insert into test.t_case(case_no) values ("1"), ("2"), ("3"), ("4");
 
-mysql> alter table test.t_case add column `source` varchar(20) not null;
+mysql> alter table test.t_case add column source varchar(20) not null;
 ## drop the primary key, add new primary key with case_no and source
 mysql> alter table test.t_case drop primary key;
-mysql> alter table test.t_case add primary key (`case_no`, `source`);
+mysql> alter table test.t_case add primary key (case_no, source);
 
 ## send the snapshot data to tiflash
 mysql> alter table test.t_case set tiflash replica 1;