Made sure that SELECT from the test case for bug BUG#56862/64041 uses

the same execution plan that is in the output of the corresponding
EXPLAIN.

mysql-test/r/index_merge_innodb.result

@@ -692,7 +692,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
 2	DERIVED	t1	index_merge	PRIMARY,idx	idx,PRIMARY	5,4	NULL	11419	Using sort_union(idx,PRIMARY); Using where
 SELECT COUNT(*) FROM 
-(SELECT * FROM t1 
+(SELECT * FROM t1 FORCE INDEX(primary,idx)
 WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
 COUNT(*)
 6145

mysql-test/t/index_merge_innodb.test

@@ -71,7 +71,7 @@ SELECT COUNT(*) FROM
   (SELECT * FROM t1 FORCE INDEX(primary,idx)
      WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
 SELECT COUNT(*) FROM 
-  (SELECT * FROM t1 
+  (SELECT * FROM t1 FORCE INDEX(primary,idx)
      WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
 
 --replace_column 9 #