This file is indexed.

/usr/lib/mysql-testsuite/r/bug57430.result is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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CREATE TABLE t2970 (a INT, b INT, c INT, d INT, KEY(a), KEY(a, b)) ENGINE=InnoDB;
INSERT INTO t2970 VALUES (1,1,1,1), (1,2,3,4);
EXPLAIN SELECT a, COUNT(b), MAX(b) FROM t2970 WHERE a > 0 GROUP BY a ORDER BY a;;
id	1
select_type	SIMPLE
table	t2970
type	index
possible_keys	a,a_2
key	a_2
key_len	10
ref	NULL
rows	2
Extra	Using where; Using index
DROP TABLE t2970;