Newsletter\Model\Subscriber::loadByEmail() does not use MySQL index #12787
Description
Preconditions
- Any Magento version between 1.0 and 2.2
Steps to reproduce
- Call
$subscriber->loadByEmail($email)with debugger or profiler - Inspect SQL query
- Inspect execution plan
EXPLAIN SELECT * FROM newsletter_subscriber WHERE subscriber_email='...'
Expected result
- An index should be use to retrieve the subscriber instantly
Actual result
- No index is used, resulting in a slow "Using where" query like this:
+----+-------------+-----------------------+------+---------------+------+---------+------+-------+-------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-----------------------+------+---------------+------+---------+------+-------+-------------+
| 1 | SIMPLE | newsletter_subscriber | ALL | NULL | NULL | NULL | NULL | 75735 | Using where |
+----+-------------+-----------------------+------+---------------+------+---------+------+-------+-------------+