diff --git a/cmd/explaintest/r/new_character_set_builtin.result b/cmd/explaintest/r/new_character_set_builtin.result
index dd90408c24fd9..e0c6b33e521da 100644
--- a/cmd/explaintest/r/new_character_set_builtin.result
+++ b/cmd/explaintest/r/new_character_set_builtin.result
@@ -234,20 +234,16 @@ char(a using gbk)	char(a using utf8)	char(a)
 A	A	A
 
釦	
â@	
â@
 NULL	[Í	[Í
-select char(a using gbk) from t;
-char(a using gbk)
-A
-
釦
-NULL
+select char(12345678 using gbk);
+char(12345678 using gbk)
+ç³°N
 set @@tidb_enable_vectorized_expression = true;
 select char(a using gbk), char(a using utf8), char(a) from t;
 char(a using gbk)	char(a using utf8)	char(a)
 A	A	A
 
釦	
â@	
â@
 NULL	[Í	[Í
-select char(a using gbk) from t;
-char(a using gbk)
-A
-
釦
-NULL
+select char(12345678 using gbk);
+char(12345678 using gbk)
+ç³°N
 set @@tidb_enable_vectorized_expression = false;
diff --git a/cmd/explaintest/t/new_character_set_builtin.test b/cmd/explaintest/t/new_character_set_builtin.test
index ae5fc99e30269..4260119b7994e 100644
--- a/cmd/explaintest/t/new_character_set_builtin.test
+++ b/cmd/explaintest/t/new_character_set_builtin.test
@@ -127,8 +127,8 @@ drop table if exists t;
 create table t (a char(20));
 insert into t values ('65'), ('123456'), ('123456789');
 select char(a using gbk), char(a using utf8), char(a) from t;
-select char(a using gbk) from t;
+select char(12345678 using gbk);
 set @@tidb_enable_vectorized_expression = true;
 select char(a using gbk), char(a using utf8), char(a) from t;
-select char(a using gbk) from t;
+select char(12345678 using gbk);
 set @@tidb_enable_vectorized_expression = false;