MariaDB [test]> EXPLAIN EXTENDED SELECT c FROM t WHERE c LIKE '%%';
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+------+-------------+-------+------+---------------+------+---------+------+------+----------+-------------+
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| id | select_type | table | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
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+------+-------------+-------+------+---------------+------+---------+------+------+----------+-------------+
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| 1 | SIMPLE | t | ALL | NULL | NULL | NULL | NULL | 5 | 100.00 | Using where |
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+------+-------------+-------+------+---------------+------+---------+------+------+----------+-------------+
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1 row in set, 1 warning (0.05 sec)
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Note (Code 1003): select `test`.`t`.`c` AS `c` from `test`.`t` where (`test`.`t`.`c` like '%%')
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