This file is indexed.

/usr/lib/mysql-testsuite/r/subselect_debug.result is in mysql-testsuite-5.6 5.6.16-1~exp1.

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 t1(id INT);
INSERT INTO t1 VALUES (1),(2),(3),(4);
INSERT INTO t1 SELECT a.id FROM t1 a,t1 b,t1 c,t1 d;
SET @orig_debug = @@debug;
SET SESSION debug="d,subselect_exec_fail";
SELECT SUM(EXISTS(SELECT RAND() FROM t1)) FROM t1;
SUM(EXISTS(SELECT RAND() FROM t1))
0
SELECT REVERSE(EXISTS(SELECT RAND() FROM t1));
REVERSE(EXISTS(SELECT RAND() FROM t1))
0
SET SESSION debug=@orig_debug;
DROP TABLE t1;