This file is indexed.

/usr/lib/mysql-testsuite/r/func_isnull.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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drop table if exists t1;
create table t1 (id int auto_increment primary key not null, mydate date not null);
insert into t1 values (0,"2002-05-01"),(0,"2002-05-01"),(0,"2002-05-01");
flush tables;
select * from t1 where isnull(to_days(mydate));
id	mydate
drop table t1;
#
# Bug#53933 crash when using uncacheable subquery in the having clause of outer query
#
CREATE TABLE t1 (f1 INT);
INSERT INTO t1 VALUES (0),(0);
SELECT ISNULL((SELECT GET_LOCK('Bug#53933', 0) FROM t1 GROUP BY f1)) AS f2
FROM t1 GROUP BY f1 HAVING f2 = f2;
f2
0
SELECT RELEASE_LOCK('Bug#53933');
RELEASE_LOCK('Bug#53933')
1
DROP TABLE t1;
End of 5.0 tests
CREATE TABLE t1 (id INTEGER UNSIGNED NOT NULL AUTO_INCREMENT, PRIMARY KEY(id));
INSERT INTO t1( id ) VALUES ( NULL );
SELECT t1.id  FROM t1  WHERE (id  is not null and id is null );
id
DROP TABLE t1;