This is an automated cherry-pick of pingcap#61080

Signed-off-by: ti-chi-bot <[email protected]>
Signed-off-by: xhe <[email protected]>

Author: xhebox

cmd/explaintest/r/new_character_set.result

@@ -91,3 +91,14 @@ set @@character_set_connection=gbk;
 select hex('一a'), '一a';
 hex('涓?')	涓?
 E4B83F	涓?
+set character_set_results = "gbk";
+select cast(0x414141E280A9424242 as char charset utf8mb4);
+cast(0x414141E280A9424242 as char charset utf8mb4)
+AAA?BBB
+SET character_set_results = @undefined_var;
+create table t61085 (a char(255) charset gbk);
+insert into t61085 values ('AAA');
+set SESSION sql_mode = '';
+select * from t61085 where a = cast(0x41414180424242 as char charset gbk);
+Error 1105: Cannot convert string 'AAA\x80BB...' from binary to gbk
+DROP TABLE t61085;