This file is indexed.

/usr/lib/mysql-testsuite/r/no-threads.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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select 1+1;
1+1
2
select 1+2;
1+2
3
SHOW GLOBAL VARIABLES LIKE 'thread_handling';
Variable_name	Value
thread_handling	no-threads
select @@session.thread_handling;
ERROR HY000: Variable 'thread_handling' is a GLOBAL variable
set GLOBAL thread_handling='one-thread';
ERROR HY000: Variable 'thread_handling' is a read only variable