This file is indexed.

/usr/share/mysql/mysql-test/r/myisam-metadata.result is in mariadb-test-5.5 5.5.36-1.

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 PRIMARY KEY,
a VARCHAR(100),
INDEX(a)
) ENGINE=MyISAM;
ALTER TABLE t1 DISABLE KEYS;
SET debug_sync= 'myisam_after_repair_by_sort SIGNAL waiting WAIT_FOR go';
ALTER TABLE t1 ENABLE KEYS;
SET debug_sync= 'now WAIT_FOR waiting';
SET debug_sync= 'now SIGNAL go';
SHOW TABLE STATUS LIKE 't1';
Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
t1	MyISAM	10	Dynamic	100000	27	#	#	#	0	NULL	#	#	#	latin1_swedish_ci	NULL		
DROP TABLE t1;