This file is indexed.

/usr/lib/mysql-testsuite/r/blackhole.result is in percona-xtradb-cluster-testsuite-5.5 5.5.34-25.9+dfsg-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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#
# Bug #11880012: INDEX_SUBQUERY, BLACKHOLE,
#                HANG IN PREPARING WITH 100% CPU USAGE
#
CREATE TABLE t1(a INT NOT NULL);
INSERT INTO t1 VALUES (1), (2), (3);
CREATE TABLE t2 (a INT UNSIGNED, b INT, UNIQUE KEY (a, b)) ENGINE=BLACKHOLE;
SELECT 1 FROM t1 WHERE a = ANY (SELECT a FROM t2);
1
DROP TABLE t1, t2;
End of 5.5 tests