diff --git a/ddl/db_integration_test.go b/ddl/db_integration_test.go
index cafaff591f815..9dca70c504340 100644
--- a/ddl/db_integration_test.go
+++ b/ddl/db_integration_test.go
@@ -2115,7 +2115,6 @@ func TestDefaultColumnWithUUID(t *testing.T) {
 	store := testkit.CreateMockStoreWithSchemaLease(t, testLease)
 	tk := testkit.NewTestKit(t, store)
 	tk.MustExec("use test")
-<<<<<<< HEAD:ddl/db_integration_test.go
 	tk.MustExec("drop table if exists t")
 
 	tk.MustExec("create table t (c int(10), c1 varchar(256) default (uuid()))")
@@ -2136,51 +2135,13 @@ func TestDefaultColumnWithUUID(t *testing.T) {
 			"  `c` int(10) DEFAULT NULL,\n" +
 			"  `c1` varchar(256) DEFAULT uuid()\n" +
 			") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin"))
-=======
-	tk.MustExec("drop table if exists t, t1, t2")
-
-	// date_format
-	tk.MustExec("create table t6 (c int(10), c1 int default (date_format(now(),'%Y-%m-%d %H:%i:%s')))")
-	tk.MustExec("create table t7 (c int(10), c1 date default (date_format(now(),'%Y-%m')))")
-	// Error message like: Error 1292 (22007): Truncated incorrect DOUBLE value: '2024-03-05 16:37:25'.
-	tk.MustGetErrCode("insert into t6(c) values (1)", errno.ErrTruncatedWrongValue)
-	tk.MustGetErrCode("insert into t7(c) values (1)", errno.ErrTruncatedWrongValue)
 
-	// user
-	tk.MustExec("create table t (c int(10), c1 varchar(256) default (upper(substring_index(user(),'@',1))));")
-	tk.Session().GetSessionVars().User = &auth.UserIdentity{Username: "root", Hostname: "localhost"}
-	tk.MustExec("insert into t(c) values (1),(2),(3)")
-	tk.Session().GetSessionVars().User = &auth.UserIdentity{Username: "xyz", Hostname: "localhost"}
-	tk.MustExec("insert into t(c) values (4),(5),(6)")
-	tk.MustExec("insert into t values (7, default)")
-	rows := tk.MustQuery("SELECT c1 from t order by c").Rows()
-	for i, row := range rows {
-		d, ok := row[0].(string)
-		require.True(t, ok)
-		if i < 3 {
-			require.Equal(t, "ROOT", d)
-		} else {
-			require.Equal(t, "XYZ", d)
-		}
-	}
-
-	// replace
-	tk.MustExec("create table t1 (c int(10), c1 int default (REPLACE(UPPER(UUID()), '-', '')))")
-	// Different UUID values will result in different error code.
-	_, err := tk.Exec("insert into t1(c) values (1)")
-	originErr := errors.Cause(err)
-	tErr, ok := originErr.(*terror.Error)
-	require.Truef(t, ok, "expect type 'terror.Error', but obtain '%T': %v", originErr, originErr)
-	sqlErr := terror.ToSQLError(tErr)
-	if int(sqlErr.Code) != errno.ErrTruncatedWrongValue {
-		require.Equal(t, errno.ErrDataOutOfRange, int(sqlErr.Code))
-	}
 	// test modify column
-	// The error message has UUID, so put this test here.
-	tk.MustExec("create table t2(c int(10), c1 varchar(256) default (REPLACE(UPPER(UUID()), '-', '')), index idx(c1));")
-	tk.MustExec("insert into t2(c) values (1),(2),(3);")
-	tk.MustGetErrCode("alter table t2 modify column c1 varchar(30) default 'xx';", errno.WarnDataTruncated)
->>>>>>> 1e5c179bef0 (ddl, tests: add expression default values feature relevant tests for some DDLs and fix a related bug (#51571)):pkg/ddl/db_integration_test.go
+	tk.MustExec("drop table if exists t")
+	tk.MustExec("create table t (c int(10), c1 varchar(256) default rand());")
+	tk.MustExec("alter table t alter column c1 set default 'xx';")
+	tk.MustExec("insert into t values (1, default);")
+	tk.MustQuery("select c1 from t;").Check(testkit.Rows("xx"))
 }
 
 func TestChangingDBCharset(t *testing.T) {
diff --git a/tests/integrationtest/r/ddl/default_as_expression.result b/tests/integrationtest/r/ddl/default_as_expression.result
deleted file mode 100644
index e5779aa89a3f6..0000000000000
--- a/tests/integrationtest/r/ddl/default_as_expression.result
+++ /dev/null
@@ -1,738 +0,0 @@
-use test;
-drop table if exists t0, t1, t2, t3, t4, t5, t6, t7;
-create table t0 (c int(10), c1 varchar(256) default (date_format(now(),'%Y-%m')));
-create table t1 (c int(10), c1 datetime default (date_format(now(),'%Y-%m-%d')));
-create table t2 (c int(10), c1 varchar(256) default (date_format(now(),'%Y-%m-%d %H.%i.%s')));
-create table t3 (c int(10), c1 timestamp default (date_format(now(),'%Y-%m-%d %H.%i.%s')));
-create table t4 (c int(10), c1 date default (date_format(now(),'%Y-%m-%d %H:%i:%s')));
-create table t5 (c int(10), c1 date default (date_format(now(),_utf8mb4'%Y-%m-%d %H:%i:%s')));
-create table t6 (c int(10), c1 varchar(256) default (date_format(now(),'%b %d %Y %h:%i %p')));
-Error 3770 (HY000): Default value expression of column 'c1' contains a disallowed function: `KindString %b %d %Y %h:%i %p`.
-create table t7 (c int(10), c1 varchar(256) default (date_format(now(),'%Y-%m-%d %H:%i:%s %p')));
-Error 3770 (HY000): Default value expression of column 'c1' contains a disallowed function: `KindString %Y-%m-%d %H:%i:%s %p`.
-alter table t0 add column c2 date default (date_format(now(),'%Y-%m'));
-Error 1674 (HY000): Statement is unsafe because it uses a system function that may return a different value on the slave
-SET @x := NOW();
-insert into t0(c) values (1);
-insert into t0 values (2, default);
-SELECT * FROM t0 WHERE c = date_format(@x,'%Y-%m') OR c = date_format(DATE_ADD(@x, INTERVAL 1 SECOND), '%Y-%m');
-c	c1
-insert into t1(c) values (1);
-insert into t1 values (2, default);
-SELECT * FROM t1 WHERE c = date_format(@x,'%Y-%m-%d');
-c	c1
-insert into t2(c) values (1);
-insert into t2 values (2, default);
-SELECT * FROM t2 WHERE c = date_format(@x,'%Y-%m-%d %H.%i.%s') OR c = date_format(DATE_ADD(@x, INTERVAL 1 SECOND), '%Y-%m-%d %H.%i.%s');
-c	c1
-SET @x := NOW();
-insert into t3(c) values (1);
-insert into t3 values (2, default);
-SELECT * FROM t3 WHERE c = date_format(@x,'%Y-%m-%d %H.%i.%s') OR c = date_format(DATE_ADD(@x, INTERVAL 1 SECOND), '%Y-%m-%d %H.%i.%s');
-c	c1
-insert into t4(c) values (1);
-insert into t4 values (2, default);
-SELECT * FROM t4 WHERE c = date_format(@x,'%Y-%m-%d %H:%i:%s') OR c = date_format(DATE_ADD(@x, INTERVAL 1 SECOND), '%Y-%m-%d %H:%i:%s');
-c	c1
-insert into t5(c) values (1);
-insert into t5 values (2, default);
-SELECT * FROM t5 WHERE c = date_format(@x,'%Y-%m-%d %H:%i:%s') OR c = date_format(DATE_ADD(@x, INTERVAL 1 SECOND), '%Y-%m-%d %H:%i:%s');
-c	c1
-show create table t0;
-Table	Create Table
-t0	CREATE TABLE `t0` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(256) DEFAULT date_format(now(), _utf8mb4'%Y-%m')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `c` int(10) DEFAULT NULL,
-  `c1` datetime DEFAULT date_format(now(), _utf8mb4'%Y-%m-%d')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t2;
-Table	Create Table
-t2	CREATE TABLE `t2` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(256) DEFAULT date_format(now(), _utf8mb4'%Y-%m-%d %H.%i.%s')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-alter table t0 add index idx(c1);
-alter table t1 add index idx(c1);
-insert into t0 values (3, default);
-insert into t1 values (3, default);
-show create table t0;
-Table	Create Table
-t0	CREATE TABLE `t0` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(256) DEFAULT date_format(now(), _utf8mb4'%Y-%m'),
-  KEY `idx` (`c1`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `c` int(10) DEFAULT NULL,
-  `c1` datetime DEFAULT date_format(now(), _utf8mb4'%Y-%m-%d'),
-  KEY `idx` (`c1`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-alter table t0 modify column c1 varchar(30) default 'xx';
-alter table t1 modify column c1 varchar(30) default 'xx';
-insert into t0 values (4, default);
-insert into t1 values (4, default);
-show create table t0;
-Table	Create Table
-t0	CREATE TABLE `t0` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(30) DEFAULT 'xx',
-  KEY `idx` (`c1`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(30) DEFAULT 'xx',
-  KEY `idx` (`c1`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-alter table t0 modify column c1 datetime DEFAULT (date_format(now(), '%Y-%m-%d'));
-Error 1292 (22007): Incorrect datetime value: '2024-03'
-alter table t0 alter column c1 SET DEFAULT (date_format(now(), '%Y-%m-%d'));
-insert into t0 values (5, default);
-alter table t1 modify column c1 datetime DEFAULT (date_format(now(), '%Y-%m-%d'));
-Error 1292 (22007): Incorrect datetime value: 'xx'
-delete from t1 where c = 4;
-alter table t1 modify column c1 datetime DEFAULT (date_format(now(), '%Y-%m-%d'));
-insert into t1 values (5, default);
-alter table t0 drop index idx;
-alter table t1 drop index idx;
-show create table t0;
-Table	Create Table
-t0	CREATE TABLE `t0` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(30) DEFAULT date_format(now(), _utf8mb4'%Y-%m-%d')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `c` int(10) DEFAULT NULL,
-  `c1` datetime DEFAULT date_format(now(), _utf8mb4'%Y-%m-%d')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-SELECT count(1) FROM t0 WHERE c1 = date_format(@x,'%Y-%m') OR c1 = date_format(@x,'%Y-%m-%d') OR c1 = "xx";
-count(1)
-5
-SELECT count(1) FROM t1 WHERE c1 = date_format(@x,'%Y-%m-%d');
-count(1)
-4
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t1' AND COLUMN_NAME='c1';
-column_default	extra
-date_format(now(), _utf8mb4'%Y-%m-%d')	DEFAULT_GENERATED
-show columns from test.t1 where field='c1';
-Field	Type	Null	Key	Default	Extra
-c1	datetime	YES		date_format(now(), _utf8mb4'%Y-%m-%d')	DEFAULT_GENERATED
-drop table if exists t, t1, t2;
-create table t (c int(10), c1 varchar(256) default (REPLACE(UPPER(UUID()), '-', '')), index idx(c1));
-create table t1 (c int(10), c1 int default (REPLACE(UPPER(UUID()), '-', '')), index idx(c1));
-create table t2 (c int(10), c1 varchar(256) default (REPLACE(CONVERT(UPPER(UUID()) USING UTF8MB4), '-', '')), index idx(c1));
-create table t1 (c int(10), c1 varchar(256) default (REPLACE('xdfj-jfj', '-', '')));
-Error 3770 (HY000): Default value expression of column 'c1' contains a disallowed function: `REPLACE`.
-create table t1 (c int(10), c1 varchar(256) default (UPPER(UUID())));
-Error 3770 (HY000): Default value expression of column 'c1' contains a disallowed function: `UPPER`.
-create table t1 (c int(10), c1 varchar(256) default (REPLACE(UPPER('dfdkj-kjkl-d'), '-', '')));
-Error 3770 (HY000): Default value expression of column 'c1' contains a disallowed function: `REPLACE`.
-alter table t add column c2 varchar(32) default (REPLACE(UPPER(UUID()), '-', ''));
-Error 1674 (HY000): Statement is unsafe because it uses a system function that may return a different value on the slave
-alter table t add column c3 int default (UPPER(UUID()));
-Error 1674 (HY000): Statement is unsafe because it uses a system function that may return a different value on the slave
-alter table t add column c4 int default (REPLACE(UPPER('dfdkj-kjkl-d'), '-', ''));
-Error 1674 (HY000): Statement is unsafe because it uses a system function that may return a different value on the slave
-insert into t(c) values (1),(2),(3);
-insert into t values (4, default);
-SELECT count(1) FROM t WHERE c1 REGEXP '^[A-Z0-9]+$';
-count(1)
-4
-show create table t;
-Table	Create Table
-t	CREATE TABLE `t` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(256) DEFAULT replace(upper(uuid()), _utf8mb4'-', _utf8mb4''),
-  KEY `idx` (`c1`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `c` int(10) DEFAULT NULL,
-  `c1` int(11) DEFAULT replace(upper(uuid()), _utf8mb4'-', _utf8mb4''),
-  KEY `idx` (`c1`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t2;
-Table	Create Table
-t2	CREATE TABLE `t2` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(256) DEFAULT replace(convert(upper(uuid()) using 'utf8mb4'), _utf8mb4'-', _utf8mb4''),
-  KEY `idx` (`c1`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-alter table t alter column c1 set default 'xx';
-alter table t drop index idx;
-show create table t;
-Table	Create Table
-t	CREATE TABLE `t` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(256) DEFAULT 'xx'
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-insert into t values (5, default);
-show create table t;
-Table	Create Table
-t	CREATE TABLE `t` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(256) DEFAULT 'xx'
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-alter table t add unique index idx(c, c1);
-alter table t modify column c1 varchar(32) default (REPLACE(UPPER(UUID()), '-', ''));
-insert into t values (6, default);
-SELECT count(1) FROM t WHERE c1 REGEXP '^[A-Z0-9]+$';
-count(1)
-5
-show create table t;
-Table	Create Table
-t	CREATE TABLE `t` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(32) DEFAULT replace(upper(uuid()), _utf8mb4'-', _utf8mb4''),
-  UNIQUE KEY `idx` (`c`,`c1`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t' AND COLUMN_NAME='c1';
-column_default	extra
-replace(upper(uuid()), _utf8mb4'-', _utf8mb4'')	DEFAULT_GENERATED
-alter table t alter column c1 set default null;
-insert into t(c) values (7);
-alter table t alter column c1 drop default;
-insert into t(c) values (8);
-Error 1364 (HY000): Field 'c1' doesn't have a default value
-SELECT count(1) FROM t WHERE c1 REGEXP '^[A-Z0-9]+$';
-count(1)
-5
-drop table if exists t0, t1, t2, t3, t4, t5;
-create table t0 (c int(10), c1 varchar(32) default (str_to_date('1980-01-01','%Y-%m-%d')), c2 date default (str_to_date('9999-01-01','%Y-%m-%d')), index idx(c, c1));
-create table t1 (c int(10), c1 int default (str_to_date('1980-01-01','%Y-%m-%d')), c2 int default (str_to_date('9999-01-01','%Y-%m-%d')), unique key idx(c, c1));
-create table t3 (c int(10), c1 varchar(32) default (str_to_date('1980-01-01','%m-%d')));
-create table t4 (c int(10), c1 varchar(32) default (str_to_date('01-01','%Y-%m-%d')));
-set @sqlMode := @@session.sql_mode;
-set @@sql_mode='';
-create table t2 (c int(10), c1 blob default (str_to_date('1980-01-01','%Y-%m-%d')), c2 blob default (str_to_date('9999-01-01','%m-%d')));
-create table t5 (c int(10), c1 json default (str_to_date('9999-01-01','%Y-%m-%d')), c2 timestamp default (str_to_date('1980-01-01','%Y-%m-%d')));
-set session sql_mode=@sqlMode;
-create table t6 (c int(10), c1 varchar(32) default (str_to_date(upper('1980-01-01'),'%Y-%m-%d')));
-Error 3770 (HY000): Default value expression of column 'c1' contains a disallowed function: `str_to_date with these args`.
-create table t6 (c int(10), c1 varchar(32) default (str_to_date('1980-01-01',upper('%Y-%m-%d'))));
-Error 3770 (HY000): Default value expression of column 'c1' contains a disallowed function: `str_to_date with these args`.
-alter table t0 add column c3 varchar(32) default (str_to_date('1980-01-01','%Y-%m-%d'));
-Error 1674 (HY000): Statement is unsafe because it uses a system function that may return a different value on the slave
-alter table t0 add column c4 int default (str_to_date('1980-01-01','%Y-%m-%d'));
-Error 1674 (HY000): Statement is unsafe because it uses a system function that may return a different value on the slave
-insert into t0(c) values (1),(2),(3);
-insert into t1(c) values (1),(2),(3);
-insert into t0 values (4, default, default);
-insert into t1 values (4, default, default);
-insert into t3(c) values (1);
-Error 1292 (22007): Incorrect datetime value: '0000-00-00 00:00:00'
-insert into t4(c) values (1);
-Error 1292 (22007): Incorrect datetime value: '2001-01-00 00:00:00'
-insert into t5(c) values (1);
-set @@sql_mode='';
-insert into t2(c) values (1),(2),(3);
-insert into t2 values (4, default, default);
-set session sql_mode=@sqlMode;
-insert into t2(c) values (5);
-Error 1292 (22007): Incorrect datetime value: '0000-00-00 00:00:00'
-select * from t0;
-c	c1	c2
-1	1980-01-01	9999-01-01
-2	1980-01-01	9999-01-01
-3	1980-01-01	9999-01-01
-4	1980-01-01	9999-01-01
-select * from t1;
-c	c1	c2
-1	19800101	99990101
-2	19800101	99990101
-3	19800101	99990101
-4	19800101	99990101
-select * from t2;
-c	c1	c2
-1	1980-01-01	NULL
-2	1980-01-01	NULL
-3	1980-01-01	NULL
-4	1980-01-01	NULL
-show create table t0;
-Table	Create Table
-t0	CREATE TABLE `t0` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(32) DEFAULT str_to_date(_utf8mb4'1980-01-01', _utf8mb4'%Y-%m-%d'),
-  `c2` date DEFAULT str_to_date(_utf8mb4'9999-01-01', _utf8mb4'%Y-%m-%d'),
-  KEY `idx` (`c`,`c1`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `c` int(10) DEFAULT NULL,
-  `c1` int(11) DEFAULT str_to_date(_utf8mb4'1980-01-01', _utf8mb4'%Y-%m-%d'),
-  `c2` int(11) DEFAULT str_to_date(_utf8mb4'9999-01-01', _utf8mb4'%Y-%m-%d'),
-  UNIQUE KEY `idx` (`c`,`c1`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t2;
-Table	Create Table
-t2	CREATE TABLE `t2` (
-  `c` int(10) DEFAULT NULL,
-  `c1` blob DEFAULT str_to_date(_utf8mb4'1980-01-01', _utf8mb4'%Y-%m-%d'),
-  `c2` blob DEFAULT str_to_date(_utf8mb4'9999-01-01', _utf8mb4'%m-%d')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-alter table t0 add index idx1(c1);
-alter table t1 add unique index idx1(c, c1);
-insert into t0 values (5, default, default);
-insert into t1 values (5, default, default);
-show create table t0;
-Table	Create Table
-t0	CREATE TABLE `t0` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(32) DEFAULT str_to_date(_utf8mb4'1980-01-01', _utf8mb4'%Y-%m-%d'),
-  `c2` date DEFAULT str_to_date(_utf8mb4'9999-01-01', _utf8mb4'%Y-%m-%d'),
-  KEY `idx` (`c`,`c1`),
-  KEY `idx1` (`c1`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `c` int(10) DEFAULT NULL,
-  `c1` int(11) DEFAULT str_to_date(_utf8mb4'1980-01-01', _utf8mb4'%Y-%m-%d'),
-  `c2` int(11) DEFAULT str_to_date(_utf8mb4'9999-01-01', _utf8mb4'%Y-%m-%d'),
-  UNIQUE KEY `idx` (`c`,`c1`),
-  UNIQUE KEY `idx1` (`c`,`c1`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-alter table t0 alter column c2 set default (current_date());
-alter table t1 modify column c1 varchar(30) default 'xx';
-insert into t0 values (6, default, default);
-insert into t1 values (6, default, default);
-show create table t0;
-Table	Create Table
-t0	CREATE TABLE `t0` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(32) DEFAULT str_to_date(_utf8mb4'1980-01-01', _utf8mb4'%Y-%m-%d'),
-  `c2` date DEFAULT CURRENT_DATE,
-  KEY `idx` (`c`,`c1`),
-  KEY `idx1` (`c1`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(30) DEFAULT 'xx',
-  `c2` int(11) DEFAULT str_to_date(_utf8mb4'9999-01-01', _utf8mb4'%Y-%m-%d'),
-  UNIQUE KEY `idx` (`c`,`c1`),
-  UNIQUE KEY `idx1` (`c`,`c1`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-alter table t0 alter column c1 drop default;
-alter table t1 modify column c1 varchar(32) default (str_to_date('1980-01-01','%Y-%m-%d'));
-insert into t0 values (7, default, default);
-Error 1364 (HY000): Field 'c1' doesn't have a default value
-insert into t1 values (7, default, default);
-select * from t0 where c < 6;
-c	c1	c2
-1	1980-01-01	9999-01-01
-2	1980-01-01	9999-01-01
-3	1980-01-01	9999-01-01
-4	1980-01-01	9999-01-01
-5	1980-01-01	9999-01-01
-select c, c1 from t0 where c = 6 and c2 = date_format(now(),'%Y-%m-%d');;
-c	c1
-6	1980-01-01
-select * from t1;
-c	c1	c2
-1	19800101	99990101
-2	19800101	99990101
-3	19800101	99990101
-4	19800101	99990101
-5	19800101	99990101
-6	xx	99990101
-7	1980-01-01	99990101
-select * from t2;
-c	c1	c2
-1	1980-01-01	NULL
-2	1980-01-01	NULL
-3	1980-01-01	NULL
-4	1980-01-01	NULL
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t1' AND COLUMN_NAME='c1';
-column_default	extra
-str_to_date(_utf8mb4'1980-01-01', _utf8mb4'%Y-%m-%d')	DEFAULT_GENERATED
-drop table if exists t, t1, t2;
-create table t (c int(10), c1 varchar(256) default (upper(substring_index(user(),'@',1))), unique index idx(c, c1));
-create table t1 (c int(10), c1 int default (upper(substring_index(user(),_utf8mb4'@',1))));
-create table t2 (c int(10), c1 varchar(256) default (substring_index(user(),'@',1)));
-Error 3770 (HY000): Default value expression of column 'c1' contains a disallowed function: `substring_index`.
-create table t2 (c int(10), c1 varchar(256) default (upper(substring_index('fjks@jkkl','@',1))));
-Error 3770 (HY000): Default value expression of column 'c1' contains a disallowed function: `upper`.
-create table t2 (c int(10), c1 varchar(256) default (upper(substring_index(user(),'x',1))));
-Error 3770 (HY000): Default value expression of column 'c1' contains a disallowed function: `KindString x`.
-alter table t add column c2 varchar(32) default (upper(substring_index(user(),'@',1)));
-Error 1674 (HY000): Statement is unsafe because it uses a system function that may return a different value on the slave
-alter table t add column c3 int default (upper(substring_index('fjks@jkkl','@',1)));
-Error 1674 (HY000): Statement is unsafe because it uses a system function that may return a different value on the slave
-insert into t1(c) values (1);
-Error 1292 (22007): Truncated incorrect DOUBLE value: 'ROOT'
-show create table t;
-Table	Create Table
-t	CREATE TABLE `t` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(256) DEFAULT upper(substring_index(user(), _utf8mb4'@', 1)),
-  UNIQUE KEY `idx` (`c`,`c1`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `c` int(10) DEFAULT NULL,
-  `c1` int(11) DEFAULT upper(substring_index(user(), _utf8mb4'@', 1))
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-alter table t1 modify column c1 varchar(30) default 'xx';
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(30) DEFAULT 'xx'
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-alter table t1 modify column c1 varchar(32) default (upper(substring_index(user(),'@',1)));
-alter table t1 add index idx1(c1);
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `c` int(10) DEFAULT NULL,
-  `c1` varchar(32) DEFAULT upper(substring_index(user(), _utf8mb4'@', 1)),
-  KEY `idx1` (`c1`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t1' AND COLUMN_NAME='c1';
-column_default	extra
-upper(substring_index(user(), _utf8mb4'@', 1))	DEFAULT_GENERATED
-drop table if exists t0, t1, t2, t3;
-create table t0 (c int(10), c1 BLOB default (date_format(now(),'%Y-%m-%d')));
-create table t1 (c int(10), c1 JSON default (date_format(now(),'%Y-%m-%d')));
-create table t2 (c int(10), c1 ENUM('y','n') default (date_format(now(),'%Y-%m-%d')));
-create table t3 (c int(10), c1 SET('y','n') default (date_format(now(),'%Y-%m-%d')));
-INSERT INTO t0 values ();
-INSERT INTO t0 values (1, DEFAULT);
-select count(1) from t0 where c1 = date_format(now(), '%Y-%m-%d');
-count(1)
-2
-INSERT INTO t1 values ();
-Error 3140 (22032): Invalid JSON text: The document root must not be followed by other values.
-INSERT INTO t1 values (1, DEFAULT);
-Error 3140 (22032): Invalid JSON text: The document root must not be followed by other values.
-SELECT * from t1;
-c	c1
-INSERT INTO t2 values ();
-Error 1265 (01000): Data truncated for column '%s' at row %d
-INSERT INTO t2 values (1, DEFAULT);
-Error 1265 (01000): Data truncated for column '%s' at row %d
-SELECT * from t2;
-c	c1
-INSERT INTO t3 values ();
-Error 1265 (01000): Data truncated for column '%s' at row %d
-INSERT INTO t3 values (1, DEFAULT);
-Error 1265 (01000): Data truncated for column '%s' at row %d
-SELECT * from t3;
-c	c1
-show create table t0;
-Table	Create Table
-t0	CREATE TABLE `t0` (
-  `c` int(10) DEFAULT NULL,
-  `c1` blob DEFAULT date_format(now(), _utf8mb4'%Y-%m-%d')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `c` int(10) DEFAULT NULL,
-  `c1` json DEFAULT date_format(now(), _utf8mb4'%Y-%m-%d')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t2;
-Table	Create Table
-t2	CREATE TABLE `t2` (
-  `c` int(10) DEFAULT NULL,
-  `c1` enum('y','n') DEFAULT date_format(now(), _utf8mb4'%Y-%m-%d')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t3;
-Table	Create Table
-t3	CREATE TABLE `t3` (
-  `c` int(10) DEFAULT NULL,
-  `c1` set('y','n') DEFAULT date_format(now(), _utf8mb4'%Y-%m-%d')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t0' AND COLUMN_NAME='c1';
-column_default	extra
-date_format(now(), _utf8mb4'%Y-%m-%d')	DEFAULT_GENERATED
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t1' AND COLUMN_NAME='c1';
-column_default	extra
-date_format(now(), _utf8mb4'%Y-%m-%d')	DEFAULT_GENERATED
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t2' AND COLUMN_NAME='c1';
-column_default	extra
-date_format(now(), _utf8mb4'%Y-%m-%d')	DEFAULT_GENERATED
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t3' AND COLUMN_NAME='c1';
-column_default	extra
-date_format(now(), _utf8mb4'%Y-%m-%d')	DEFAULT_GENERATED
-alter table t0 alter column c1 set default "xx";
-Error 1101 (42000): BLOB/TEXT/JSON column 'c1' can't have a default value
-alter table t1 alter column c1 set default "xx";
-Error 1101 (42000): BLOB/TEXT/JSON column 'c1' can't have a default value
-alter table t2 alter column c1 set default 'y';
-alter table t3 alter column c1 set default 'n';
-INSERT INTO t0 values (2, DEFAULT);
-INSERT INTO t2 values (2, DEFAULT);
-INSERT INTO t3 values (2, DEFAULT);
-alter table t0 modify column c1 BLOB default (date_format(now(),'%Y-%m-%d'));
-alter table t1 modify column c1 JSON default (date_format(now(),'%Y-%m-%d'));
-alter table t2 modify column c1 ENUM('y','n') default (date_format(now(),'%Y-%m-%d'));
-alter table t3 modify column c1 SET('y','n') default (date_format(now(),'%Y-%m-%d'));
-INSERT INTO t0 values (3, DEFAULT);
-show create table t0;
-Table	Create Table
-t0	CREATE TABLE `t0` (
-  `c` int(10) DEFAULT NULL,
-  `c1` blob DEFAULT date_format(now(), _utf8mb4'%Y-%m-%d')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `c` int(10) DEFAULT NULL,
-  `c1` json DEFAULT date_format(now(), _utf8mb4'%Y-%m-%d')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t2;
-Table	Create Table
-t2	CREATE TABLE `t2` (
-  `c` int(10) DEFAULT NULL,
-  `c1` enum('y','n') DEFAULT date_format(now(), _utf8mb4'%Y-%m-%d')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t3;
-Table	Create Table
-t3	CREATE TABLE `t3` (
-  `c` int(10) DEFAULT NULL,
-  `c1` set('y','n') DEFAULT date_format(now(), _utf8mb4'%Y-%m-%d')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-alter table t0 alter column c1 drop default;
-alter table t1 alter column c1 drop default;
-alter table t2 alter column c1 drop default;
-alter table t3 alter column c1 drop default;
-show create table t0;
-Table	Create Table
-t0	CREATE TABLE `t0` (
-  `c` int(10) DEFAULT NULL,
-  `c1` blob
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `c` int(10) DEFAULT NULL,
-  `c1` json
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t2;
-Table	Create Table
-t2	CREATE TABLE `t2` (
-  `c` int(10) DEFAULT NULL,
-  `c1` enum('y','n')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t3;
-Table	Create Table
-t3	CREATE TABLE `t3` (
-  `c` int(10) DEFAULT NULL,
-  `c1` set('y','n')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-select count(1) from t0 where c1 = date_format(now(), '%Y-%m-%d');
-count(1)
-4
-select * from t2;
-c	c1
-2	y
-select * from t3;
-c	c1
-2	n
-drop table t0, t1, t2, t3;
-create table t0 (c int(10), c1 BLOB default (REPLACE(UPPER(UUID()), '-', '')));
-create table t1 (c int(10), c1 JSON default (REPLACE(UPPER(UUID()), '-', '')));
-create table t2 (c int(10), c1 ENUM('y','n') default (REPLACE(UPPER(UUID()), '-', '')));
-create table t3 (c int(10), c1 SET('y','n') default (REPLACE(UPPER(UUID()), '-', '')));
-INSERT INTO t0 values ();
-INSERT INTO t0 values (1, DEFAULT);
-SELECT count(1) FROM t0 WHERE c1 REGEXP '^[A-Z0-9]+$';
-count(1)
-2
-INSERT INTO t1 values ();
-Error 3140 (22032): Invalid JSON text: The document root must not be followed by other values.
-INSERT INTO t1 values (1, DEFAULT);
-Error 3140 (22032): Invalid JSON text: The document root must not be followed by other values.
-SELECT * from t1;
-c	c1
-INSERT INTO t2 values ();
-Error 1265 (01000): Data truncated for column '%s' at row %d
-INSERT INTO t2 values (1, DEFAULT);
-Error 1265 (01000): Data truncated for column '%s' at row %d
-SELECT * from t2;
-c	c1
-INSERT INTO t3 values ();
-Error 1265 (01000): Data truncated for column '%s' at row %d
-INSERT INTO t3 values (1, DEFAULT);
-Error 1265 (01000): Data truncated for column '%s' at row %d
-SELECT * from t3;
-c	c1
-show create table t0;
-Table	Create Table
-t0	CREATE TABLE `t0` (
-  `c` int(10) DEFAULT NULL,
-  `c1` blob DEFAULT replace(upper(uuid()), _utf8mb4'-', _utf8mb4'')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `c` int(10) DEFAULT NULL,
-  `c1` json DEFAULT replace(upper(uuid()), _utf8mb4'-', _utf8mb4'')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t2;
-Table	Create Table
-t2	CREATE TABLE `t2` (
-  `c` int(10) DEFAULT NULL,
-  `c1` enum('y','n') DEFAULT replace(upper(uuid()), _utf8mb4'-', _utf8mb4'')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t3;
-Table	Create Table
-t3	CREATE TABLE `t3` (
-  `c` int(10) DEFAULT NULL,
-  `c1` set('y','n') DEFAULT replace(upper(uuid()), _utf8mb4'-', _utf8mb4'')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t0' AND COLUMN_NAME='c1';
-column_default	extra
-replace(upper(uuid()), _utf8mb4'-', _utf8mb4'')	DEFAULT_GENERATED
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t1' AND COLUMN_NAME='c1';
-column_default	extra
-replace(upper(uuid()), _utf8mb4'-', _utf8mb4'')	DEFAULT_GENERATED
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t2' AND COLUMN_NAME='c1';
-column_default	extra
-replace(upper(uuid()), _utf8mb4'-', _utf8mb4'')	DEFAULT_GENERATED
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t3' AND COLUMN_NAME='c1';
-column_default	extra
-replace(upper(uuid()), _utf8mb4'-', _utf8mb4'')	DEFAULT_GENERATED
-drop table t0, t1, t2, t3;
-create table t0 (c int(10), c1 BLOB default (str_to_date('1980-01-01','%Y-%m-%d')));
-create table t1 (c int(10), c1 JSON default (str_to_date('1980-01-01','%Y-%m-%d')));
-create table t2 (c int(10), c1 ENUM('y','n') default (str_to_date('1980-01-01','%Y-%m-%d')));
-create table t3 (c int(10), c1 SET('y','n') default (str_to_date('1980-01-01','%Y-%m-%d')));
-INSERT INTO t0 values ();
-INSERT INTO t0 values (1, DEFAULT);
-SELECT * from t0;
-c	c1
-NULL	1980-01-01
-1	1980-01-01
-INSERT INTO t1 values ();
-INSERT INTO t1 values (1, DEFAULT);
-SELECT * from t1;
-c	c1
-NULL	"1980-01-01"
-1	"1980-01-01"
-INSERT INTO t2 values ();
-Error 1265 (01000): Data truncated for column '%s' at row %d
-INSERT INTO t2 values (1, DEFAULT);
-Error 1265 (01000): Data truncated for column '%s' at row %d
-SELECT * from t2;
-c	c1
-INSERT INTO t3 values ();
-Error 1265 (01000): Data truncated for column '%s' at row %d
-INSERT INTO t3 values (1, DEFAULT);
-Error 1265 (01000): Data truncated for column '%s' at row %d
-SELECT * from t3;
-c	c1
-show create table t0;
-Table	Create Table
-t0	CREATE TABLE `t0` (
-  `c` int(10) DEFAULT NULL,
-  `c1` blob DEFAULT str_to_date(_utf8mb4'1980-01-01', _utf8mb4'%Y-%m-%d')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `c` int(10) DEFAULT NULL,
-  `c1` json DEFAULT str_to_date(_utf8mb4'1980-01-01', _utf8mb4'%Y-%m-%d')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t2;
-Table	Create Table
-t2	CREATE TABLE `t2` (
-  `c` int(10) DEFAULT NULL,
-  `c1` enum('y','n') DEFAULT str_to_date(_utf8mb4'1980-01-01', _utf8mb4'%Y-%m-%d')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t3;
-Table	Create Table
-t3	CREATE TABLE `t3` (
-  `c` int(10) DEFAULT NULL,
-  `c1` set('y','n') DEFAULT str_to_date(_utf8mb4'1980-01-01', _utf8mb4'%Y-%m-%d')
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t0' AND COLUMN_NAME='c1';
-column_default	extra
-str_to_date(_utf8mb4'1980-01-01', _utf8mb4'%Y-%m-%d')	DEFAULT_GENERATED
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t1' AND COLUMN_NAME='c1';
-column_default	extra
-str_to_date(_utf8mb4'1980-01-01', _utf8mb4'%Y-%m-%d')	DEFAULT_GENERATED
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t2' AND COLUMN_NAME='c1';
-column_default	extra
-str_to_date(_utf8mb4'1980-01-01', _utf8mb4'%Y-%m-%d')	DEFAULT_GENERATED
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t3' AND COLUMN_NAME='c1';
-column_default	extra
-str_to_date(_utf8mb4'1980-01-01', _utf8mb4'%Y-%m-%d')	DEFAULT_GENERATED
-drop table t0, t1, t2, t3;
-create table t0 (c int(10), c1 BLOB default (upper(substring_index(user(),'@',1))));
-create table t1 (c int(10), c1 JSON default (upper(substring_index(user(),'@',1))));
-create table t2 (c int(10), c1 ENUM('y','n') default (upper(substring_index(user(),'@',1))));
-create table t3 (c int(10), c1 SET('y','n') default (upper(substring_index(user(),'@',1))));
-INSERT INTO t0 values ();
-INSERT INTO t0 values (1, DEFAULT);
-SELECT * from t0;
-c	c1
-NULL	ROOT
-1	ROOT
-INSERT INTO t1 values ();
-Error 3140 (22032): Invalid JSON text: The document root must not be followed by other values.
-INSERT INTO t1 values (1, DEFAULT);
-Error 3140 (22032): Invalid JSON text: The document root must not be followed by other values.
-SELECT * from t1;
-c	c1
-INSERT INTO t2 values ();
-Error 1265 (01000): Data truncated for column '%s' at row %d
-INSERT INTO t2 values (1, DEFAULT);
-Error 1265 (01000): Data truncated for column '%s' at row %d
-SELECT * from t2;
-c	c1
-INSERT INTO t3 values ();
-Error 1265 (01000): Data truncated for column '%s' at row %d
-INSERT INTO t3 values (1, DEFAULT);
-Error 1265 (01000): Data truncated for column '%s' at row %d
-SELECT * from t3;
-c	c1
-show create table t0;
-Table	Create Table
-t0	CREATE TABLE `t0` (
-  `c` int(10) DEFAULT NULL,
-  `c1` blob DEFAULT upper(substring_index(user(), _utf8mb4'@', 1))
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `c` int(10) DEFAULT NULL,
-  `c1` json DEFAULT upper(substring_index(user(), _utf8mb4'@', 1))
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t2;
-Table	Create Table
-t2	CREATE TABLE `t2` (
-  `c` int(10) DEFAULT NULL,
-  `c1` enum('y','n') DEFAULT upper(substring_index(user(), _utf8mb4'@', 1))
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-show create table t3;
-Table	Create Table
-t3	CREATE TABLE `t3` (
-  `c` int(10) DEFAULT NULL,
-  `c1` set('y','n') DEFAULT upper(substring_index(user(), _utf8mb4'@', 1))
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
-drop table t0, t1, t2, t3;
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t0' AND COLUMN_NAME='c1';
-column_default	extra
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t1' AND COLUMN_NAME='c1';
-column_default	extra
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t2' AND COLUMN_NAME='c1';
-column_default	extra
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t3' AND COLUMN_NAME='c1';
-column_default	extra
diff --git a/tests/integrationtest/t/ddl/default_as_expression.test b/tests/integrationtest/t/ddl/default_as_expression.test
deleted file mode 100644
index 09d81e1cf0e55..0000000000000
--- a/tests/integrationtest/t/ddl/default_as_expression.test
+++ /dev/null
@@ -1,385 +0,0 @@
-# TestDefaultColumnWithDateFormat
-# date_format
-use test;
-drop table if exists t0, t1, t2, t3, t4, t5, t6, t7;
-create table t0 (c int(10), c1 varchar(256) default (date_format(now(),'%Y-%m')));
-create table t1 (c int(10), c1 datetime default (date_format(now(),'%Y-%m-%d')));
-create table t2 (c int(10), c1 varchar(256) default (date_format(now(),'%Y-%m-%d %H.%i.%s')));
-create table t3 (c int(10), c1 timestamp default (date_format(now(),'%Y-%m-%d %H.%i.%s')));
-create table t4 (c int(10), c1 date default (date_format(now(),'%Y-%m-%d %H:%i:%s')));
-create table t5 (c int(10), c1 date default (date_format(now(),_utf8mb4'%Y-%m-%d %H:%i:%s')));
--- error 3770
-create table t6 (c int(10), c1 varchar(256) default (date_format(now(),'%b %d %Y %h:%i %p')));
--- error 3770
-create table t7 (c int(10), c1 varchar(256) default (date_format(now(),'%Y-%m-%d %H:%i:%s %p')));
--- error 1674
-alter table t0 add column c2 date default (date_format(now(),'%Y-%m'));
-# insert records
-SET @x := NOW();
-insert into t0(c) values (1);
-insert into t0 values (2, default);
-SELECT * FROM t0 WHERE c = date_format(@x,'%Y-%m') OR c = date_format(DATE_ADD(@x, INTERVAL 1 SECOND), '%Y-%m');
-insert into t1(c) values (1);
-insert into t1 values (2, default);
-SELECT * FROM t1 WHERE c = date_format(@x,'%Y-%m-%d');
-insert into t2(c) values (1);
-insert into t2 values (2, default);
-SELECT * FROM t2 WHERE c = date_format(@x,'%Y-%m-%d %H.%i.%s') OR c = date_format(DATE_ADD(@x, INTERVAL 1 SECOND), '%Y-%m-%d %H.%i.%s');
-SET @x := NOW();
-insert into t3(c) values (1);
-insert into t3 values (2, default);
-SELECT * FROM t3 WHERE c = date_format(@x,'%Y-%m-%d %H.%i.%s') OR c = date_format(DATE_ADD(@x, INTERVAL 1 SECOND), '%Y-%m-%d %H.%i.%s');
-insert into t4(c) values (1);
-insert into t4 values (2, default);
-SELECT * FROM t4 WHERE c = date_format(@x,'%Y-%m-%d %H:%i:%s') OR c = date_format(DATE_ADD(@x, INTERVAL 1 SECOND), '%Y-%m-%d %H:%i:%s');
-insert into t5(c) values (1);
-insert into t5 values (2, default);
-SELECT * FROM t5 WHERE c = date_format(@x,'%Y-%m-%d %H:%i:%s') OR c = date_format(DATE_ADD(@x, INTERVAL 1 SECOND), '%Y-%m-%d %H:%i:%s');
-
-show create table t0;
-show create table t1;
-show create table t2;
-
-# test modify column, set default value, add index
-alter table t0 add index idx(c1);
-alter table t1 add index idx(c1);
-insert into t0 values (3, default);
-insert into t1 values (3, default);
-show create table t0;
-show create table t1;
-alter table t0 modify column c1 varchar(30) default 'xx';
-alter table t1 modify column c1 varchar(30) default 'xx';
-insert into t0 values (4, default);
-insert into t1 values (4, default);
-show create table t0;
-show create table t1;
--- error 1292
-alter table t0 modify column c1 datetime DEFAULT (date_format(now(), '%Y-%m-%d'));
-alter table t0 alter column c1 SET DEFAULT (date_format(now(), '%Y-%m-%d'));
-insert into t0 values (5, default);
--- error 1292
-alter table t1 modify column c1 datetime DEFAULT (date_format(now(), '%Y-%m-%d'));
-delete from t1 where c = 4;
-alter table t1 modify column c1 datetime DEFAULT (date_format(now(), '%Y-%m-%d'));
-insert into t1 values (5, default);
-alter table t0 drop index idx;
-alter table t1 drop index idx;
-show create table t0;
-show create table t1;
-SELECT count(1) FROM t0 WHERE c1 = date_format(@x,'%Y-%m') OR c1 = date_format(@x,'%Y-%m-%d') OR c1 = "xx";
-SELECT count(1) FROM t1 WHERE c1 = date_format(@x,'%Y-%m-%d');
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t1' AND COLUMN_NAME='c1';
-show columns from test.t1 where field='c1';
-
-# TestDefaultColumnWithReplace
-# replace
-drop table if exists t, t1, t2;
-create table t (c int(10), c1 varchar(256) default (REPLACE(UPPER(UUID()), '-', '')), index idx(c1));
-create table t1 (c int(10), c1 int default (REPLACE(UPPER(UUID()), '-', '')), index idx(c1));
-create table t2 (c int(10), c1 varchar(256) default (REPLACE(CONVERT(UPPER(UUID()) USING UTF8MB4), '-', '')), index idx(c1));
--- error 3770
-create table t1 (c int(10), c1 varchar(256) default (REPLACE('xdfj-jfj', '-', '')));
--- error 3770
-create table t1 (c int(10), c1 varchar(256) default (UPPER(UUID())));
--- error 3770
-create table t1 (c int(10), c1 varchar(256) default (REPLACE(UPPER('dfdkj-kjkl-d'), '-', '')));
-
-# add column
--- error 1674
-alter table t add column c2 varchar(32) default (REPLACE(UPPER(UUID()), '-', ''));
--- error 1674
-alter table t add column c3 int default (UPPER(UUID()));
-# Alter support "REPLACE(UPPER('dfdkj-kjkl-d'), '-', '')", we need to support this DDL.
--- error 1674
-alter table t add column c4 int default (REPLACE(UPPER('dfdkj-kjkl-d'), '-', ''));
-
-# insert records
-insert into t(c) values (1),(2),(3);
-insert into t values (4, default);
-# It consists of uppercase letters or numbers.
-SELECT count(1) FROM t WHERE c1 REGEXP '^[A-Z0-9]+$';
-
-# Some MySQL versions of "show create table" have different results. For example, MySQL 8.0.18 has the following results:
-# `c1` varchar(16) DEFAULT (replace(convert(upper(uuid()) using utf8mb4),_utf8mb4'-',_utf8mb4''))
-show create table t;
-show create table t1;
-show create table t2;
-
-# test modify column, set default value, add index
-alter table t alter column c1 set default 'xx';
-alter table t drop index idx;
-show create table t;
-insert into t values (5, default);
-show create table t;
-alter table t add unique index idx(c, c1);
-alter table t modify column c1 varchar(32) default (REPLACE(UPPER(UUID()), '-', ''));
-insert into t values (6, default);
-SELECT count(1) FROM t WHERE c1 REGEXP '^[A-Z0-9]+$';
-show create table t;
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t' AND COLUMN_NAME='c1';
-alter table t alter column c1 set default null;
-insert into t(c) values (7);
-alter table t alter column c1 drop default;
--- error 1364
-insert into t(c) values (8);
-SELECT count(1) FROM t WHERE c1 REGEXP '^[A-Z0-9]+$';
-
-# TestDefaultColumnWithStrToDate
-# str_to_date
-drop table if exists t0, t1, t2, t3, t4, t5;
-# create table
-create table t0 (c int(10), c1 varchar(32) default (str_to_date('1980-01-01','%Y-%m-%d')), c2 date default (str_to_date('9999-01-01','%Y-%m-%d')), index idx(c, c1));
-create table t1 (c int(10), c1 int default (str_to_date('1980-01-01','%Y-%m-%d')), c2 int default (str_to_date('9999-01-01','%Y-%m-%d')), unique key idx(c, c1));
-create table t3 (c int(10), c1 varchar(32) default (str_to_date('1980-01-01','%m-%d')));
-create table t4 (c int(10), c1 varchar(32) default (str_to_date('01-01','%Y-%m-%d')));
-set @sqlMode := @@session.sql_mode;
-set @@sql_mode='';
-create table t2 (c int(10), c1 blob default (str_to_date('1980-01-01','%Y-%m-%d')), c2 blob default (str_to_date('9999-01-01','%m-%d')));
-create table t5 (c int(10), c1 json default (str_to_date('9999-01-01','%Y-%m-%d')), c2 timestamp default (str_to_date('1980-01-01','%Y-%m-%d')));
-set session sql_mode=@sqlMode;
--- error 3770
-create table t6 (c int(10), c1 varchar(32) default (str_to_date(upper('1980-01-01'),'%Y-%m-%d')));
--- error 3770
-create table t6 (c int(10), c1 varchar(32) default (str_to_date('1980-01-01',upper('%Y-%m-%d'))));
-# TODO: We need to support it.
--- error 1674
-alter table t0 add column c3 varchar(32) default (str_to_date('1980-01-01','%Y-%m-%d'));
--- error 1674
-alter table t0 add column c4 int default (str_to_date('1980-01-01','%Y-%m-%d'));
-
-# insert records
-insert into t0(c) values (1),(2),(3);
-insert into t1(c) values (1),(2),(3);
-insert into t0 values (4, default, default);
-insert into t1 values (4, default, default);
--- error 1292
-insert into t3(c) values (1);
--- error 1292
-insert into t4(c) values (1);
-# MySQL will return an error. Related issue: https://github.com/pingcap/tidb/issues/51275.
-insert into t5(c) values (1);
-set @@sql_mode='';
-insert into t2(c) values (1),(2),(3);
-insert into t2 values (4, default, default);
-set session sql_mode=@sqlMode;
--- error 1292
-insert into t2(c) values (5);
-select * from t0;
-select * from t1;
-select * from t2;
-
-show create table t0;
-show create table t1;
-show create table t2;
-
-# test modify column, set default value, add index
-alter table t0 add index idx1(c1);
-alter table t1 add unique index idx1(c, c1);
-insert into t0 values (5, default, default);
-insert into t1 values (5, default, default);
-show create table t0;
-show create table t1;
-alter table t0 alter column c2 set default (current_date());
-alter table t1 modify column c1 varchar(30) default 'xx';
-insert into t0 values (6, default, default);
-insert into t1 values (6, default, default);
-show create table t0;
-show create table t1;
-alter table t0 alter column c1 drop default;
-alter table t1 modify column c1 varchar(32) default (str_to_date('1980-01-01','%Y-%m-%d'));
--- error 1364
-insert into t0 values (7, default, default);
-insert into t1 values (7, default, default);
-select * from t0 where c < 6;
-select c, c1 from t0 where c = 6 and c2 = date_format(now(),'%Y-%m-%d');;
-select * from t1;
-select * from t2;
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t1' AND COLUMN_NAME='c1';
-
-# TestDefaultColumnWithUpper
-# upper
-drop table if exists t, t1, t2;
-# create table
-create table t (c int(10), c1 varchar(256) default (upper(substring_index(user(),'@',1))), unique index idx(c, c1));
-create table t1 (c int(10), c1 int default (upper(substring_index(user(),_utf8mb4'@',1))));
--- error 3770
-create table t2 (c int(10), c1 varchar(256) default (substring_index(user(),'@',1)));
--- error 3770
-create table t2 (c int(10), c1 varchar(256) default (upper(substring_index('fjks@jkkl','@',1))));
--- error 3770
-create table t2 (c int(10), c1 varchar(256) default (upper(substring_index(user(),'x',1))));
--- error 1674
-alter table t add column c2 varchar(32) default (upper(substring_index(user(),'@',1)));
--- error 1674
-alter table t add column c3 int default (upper(substring_index('fjks@jkkl','@',1)));
--- error 1292
-insert into t1(c) values (1);
-show create table t;
-show create table t1;
-
-# test modify column, set default value, add index
-alter table t1 modify column c1 varchar(30) default 'xx';
-show create table t1;
-alter table t1 modify column c1 varchar(32) default (upper(substring_index(user(),'@',1)));
-alter table t1 add index idx1(c1);
-show create table t1;
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t1' AND COLUMN_NAME='c1';
-
-# TestDefaultColumnWithDateFormatAndReplaceAndUpperAndStrToDate
-# Different data types for data_format.
-drop table if exists t0, t1, t2, t3;
-create table t0 (c int(10), c1 BLOB default (date_format(now(),'%Y-%m-%d')));
-create table t1 (c int(10), c1 JSON default (date_format(now(),'%Y-%m-%d')));
-create table t2 (c int(10), c1 ENUM('y','n') default (date_format(now(),'%Y-%m-%d')));
-create table t3 (c int(10), c1 SET('y','n') default (date_format(now(),'%Y-%m-%d')));
-INSERT INTO t0 values ();
-INSERT INTO t0 values (1, DEFAULT);
-select count(1) from t0 where c1 = date_format(now(), '%Y-%m-%d');
--- error 3140
-INSERT INTO t1 values ();
--- error 3140
-INSERT INTO t1 values (1, DEFAULT);
-SELECT * from t1;
--- error 1265
-INSERT INTO t2 values ();
--- error 1265
-INSERT INTO t2 values (1, DEFAULT);
-SELECT * from t2;
--- error 1265
-INSERT INTO t3 values ();
--- error 1265
-INSERT INTO t3 values (1, DEFAULT);
-SELECT * from t3;
-show create table t0;
-show create table t1;
-show create table t2;
-show create table t3;
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t0' AND COLUMN_NAME='c1';
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t1' AND COLUMN_NAME='c1';
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t2' AND COLUMN_NAME='c1';
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t3' AND COLUMN_NAME='c1';
--- error 1101
-alter table t0 alter column c1 set default "xx";
--- error 1101
-alter table t1 alter column c1 set default "xx";
-alter table t2 alter column c1 set default 'y';
-alter table t3 alter column c1 set default 'n';
-INSERT INTO t0 values (2, DEFAULT);
-INSERT INTO t2 values (2, DEFAULT);
-INSERT INTO t3 values (2, DEFAULT);
-alter table t0 modify column c1 BLOB default (date_format(now(),'%Y-%m-%d'));
-alter table t1 modify column c1 JSON default (date_format(now(),'%Y-%m-%d'));
-alter table t2 modify column c1 ENUM('y','n') default (date_format(now(),'%Y-%m-%d'));
-alter table t3 modify column c1 SET('y','n') default (date_format(now(),'%Y-%m-%d'));
-INSERT INTO t0 values (3, DEFAULT);
-show create table t0;
-show create table t1;
-show create table t2;
-show create table t3;
-alter table t0 alter column c1 drop default;
-alter table t1 alter column c1 drop default;
-alter table t2 alter column c1 drop default;
-alter table t3 alter column c1 drop default;
-show create table t0;
-show create table t1;
-show create table t2;
-show create table t3;
-select count(1) from t0 where c1 = date_format(now(), '%Y-%m-%d');
-select * from t2;
-select * from t3;
-drop table t0, t1, t2, t3;
-# Different data types for replace.
-create table t0 (c int(10), c1 BLOB default (REPLACE(UPPER(UUID()), '-', '')));
-create table t1 (c int(10), c1 JSON default (REPLACE(UPPER(UUID()), '-', '')));
-create table t2 (c int(10), c1 ENUM('y','n') default (REPLACE(UPPER(UUID()), '-', '')));
-create table t3 (c int(10), c1 SET('y','n') default (REPLACE(UPPER(UUID()), '-', '')));
-INSERT INTO t0 values ();
-INSERT INTO t0 values (1, DEFAULT);
-SELECT count(1) FROM t0 WHERE c1 REGEXP '^[A-Z0-9]+$';
--- error 3140
-INSERT INTO t1 values ();
--- error 3140
-INSERT INTO t1 values (1, DEFAULT);
-SELECT * from t1;
--- error 1265
-INSERT INTO t2 values ();
--- error 1265
-INSERT INTO t2 values (1, DEFAULT);
-SELECT * from t2;
--- error 1265
-INSERT INTO t3 values ();
--- error 1265
-INSERT INTO t3 values (1, DEFAULT);
-SELECT * from t3;
-show create table t0;
-show create table t1;
-show create table t2;
-show create table t3;
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t0' AND COLUMN_NAME='c1';
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t1' AND COLUMN_NAME='c1';
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t2' AND COLUMN_NAME='c1';
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t3' AND COLUMN_NAME='c1';
-drop table t0, t1, t2, t3;
-# Different data types for str_to_date.
-create table t0 (c int(10), c1 BLOB default (str_to_date('1980-01-01','%Y-%m-%d')));
-create table t1 (c int(10), c1 JSON default (str_to_date('1980-01-01','%Y-%m-%d')));
-create table t2 (c int(10), c1 ENUM('y','n') default (str_to_date('1980-01-01','%Y-%m-%d')));
-create table t3 (c int(10), c1 SET('y','n') default (str_to_date('1980-01-01','%Y-%m-%d')));
-INSERT INTO t0 values ();
-INSERT INTO t0 values (1, DEFAULT);
-SELECT * from t0;
-# MySQL will return an error. Related issue: https://github.com/pingcap/tidb/issues/51275.
-INSERT INTO t1 values ();
-INSERT INTO t1 values (1, DEFAULT);
-SELECT * from t1;
--- error 1265
-INSERT INTO t2 values ();
--- error 1265
-INSERT INTO t2 values (1, DEFAULT);
-SELECT * from t2;
--- error 1265
-INSERT INTO t3 values ();
--- error 1265
-INSERT INTO t3 values (1, DEFAULT);
-SELECT * from t3;
-show create table t0;
-show create table t1;
-show create table t2;
-show create table t3;
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t0' AND COLUMN_NAME='c1';
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t1' AND COLUMN_NAME='c1';
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t2' AND COLUMN_NAME='c1';
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t3' AND COLUMN_NAME='c1';
-drop table t0, t1, t2, t3;
-# Different data types for upper.
-create table t0 (c int(10), c1 BLOB default (upper(substring_index(user(),'@',1))));
-create table t1 (c int(10), c1 JSON default (upper(substring_index(user(),'@',1))));
-create table t2 (c int(10), c1 ENUM('y','n') default (upper(substring_index(user(),'@',1))));
-create table t3 (c int(10), c1 SET('y','n') default (upper(substring_index(user(),'@',1))));
-INSERT INTO t0 values ();
-INSERT INTO t0 values (1, DEFAULT);
-SELECT * from t0;
--- error 3140
-INSERT INTO t1 values ();
--- error 3140
-INSERT INTO t1 values (1, DEFAULT);
-SELECT * from t1;
--- error 1265
-INSERT INTO t2 values ();
--- error 1265
-INSERT INTO t2 values (1, DEFAULT);
-SELECT * from t2;
--- error 1265
-INSERT INTO t3 values ();
--- error 1265
-INSERT INTO t3 values (1, DEFAULT);
-SELECT * from t3;
-show create table t0;
-show create table t1;
-show create table t2;
-show create table t3;
-drop table t0, t1, t2, t3;
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t0' AND COLUMN_NAME='c1';
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t1' AND COLUMN_NAME='c1';
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t2' AND COLUMN_NAME='c1';
-SELECT column_default, extra FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema='test' AND TABLE_NAME='t3' AND COLUMN_NAME='c1';