Bug#25474239 MISC MTR TESTS FAIL WHEN CHANGING DEFAULT CHARACTER SET FOR DATABASE

Patch #7

To repeat:
./mtr --charset-for-testdb=utf8mb4 --defaults-file=include/utf8mb4_my.cnf

group_by
handler_read
key
key-bug17665767
subquery
type_timestamp
type_timestamp2
type_timestamp_explicit

Change-Id: I3539cc62ba90b7b35658f1214fd7f3769b740de6

Author: Tor Didriksen

mysql-test/r/group_by.result

@@ -2944,7 +2944,7 @@ CREATE TABLE t1 (
 a int,
 b varchar(1),
 KEY (b,a)
-);
+) charset utf8mb4;
 INSERT INTO t1 VALUES (1,NULL),(0,'a'),(1,NULL),(0,'a');
 INSERT INTO t1 VALUES (1,'a'),(0,'a'),(1,'a'),(0,'a');
 ANALYZE TABLE t1;
@@ -2953,7 +2953,7 @@ test.t1	analyze	status	OK
 
 EXPLAIN SELECT SQL_BUFFER_RESULT MIN(a), b FROM t1 WHERE t1.b = 'a' GROUP BY b;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t1	NULL	range	b	b	9	NULL	2	100.00	Using where; Using index for group-by; Using temporary
+1	SIMPLE	t1	NULL	range	b	b	12	NULL	2	100.00	Using where; Using index for group-by; Using temporary
 Warnings:
 Note	1003	/* select#1 */ select sql_buffer_result min(`test`.`t1`.`a`) AS `MIN(a)`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (`test`.`t1`.`b` = 'a') group by `test`.`t1`.`b`
 
@@ -2963,7 +2963,7 @@ MIN(a)	b
 
 EXPLAIN SELECT MIN(a), b FROM t1 WHERE t1.b = 'a' GROUP BY b;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t1	NULL	range	b	b	9	NULL	2	100.00	Using where; Using index for group-by
+1	SIMPLE	t1	NULL	range	b	b	12	NULL	2	100.00	Using where; Using index for group-by
 Warnings:
 Note	1003	/* select#1 */ select min(`test`.`t1`.`a`) AS `MIN(a)`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (`test`.`t1`.`b` = 'a') group by `test`.`t1`.`b`