DRUPAL db_or adding AND between multiple variables - sql

Question

I have inherited an application that is using the drupal filtering system to find results. The user can select to search the 'campus_location' column but when they enter multiple variables, it adds an AND between the condition.
Here is the printed version of the query generated by drupal:
SELECT * FROM champs c INNER JOIN users u ON u.uid = c.uid LEFT OUTER JOIN champs_rsvp r
ON r.uid = c.uid LEFT OUTER JOIN champs_checklists cl
ON cl.id = c.checklist_id LEFT OUTER JOIN node en
ON en.uid = u.uid AND en.type = 'getting_started_event'
LEFT OUTER JOIN node sn ON sn.uid = u.uid
AND sn.type = 'success_story'
LEFT OUTER JOIN champs_action_steps cas
ON cas.uid = u.uid
WHERE ( (c.campus_location LIKE 'Flint' ESCAPE '\\') )
**AND**( (c.campus_location LIKE 'Ann Arbor' ESCAPE '\\') )
I need the last AND to be an OR so it looks like this:
SELECT * FROM champs c INNER JOIN users u ON u.uid = c.uid LEFT OUTER JOIN champs_rsvp r
ON r.uid = c.uid LEFT OUTER JOIN champs_checklists cl
ON cl.id = c.checklist_id LEFT OUTER JOIN node en
ON en.uid = u.uid AND en.type = 'getting_started_event'
LEFT OUTER JOIN node sn ON sn.uid = u.uid
AND sn.type = 'success_story'
LEFT OUTER JOIN champs_action_steps cas
ON cas.uid = u.uid
WHERE ( (c.campus_location LIKE 'Flint' ESCAPE '\\') )
OR( (c.campus_location LIKE 'Ann Arbor' ESCAPE '\\') )
Which produces the correct results.
Here is the code that I inherited where it looks over the words in the search box. I just can't seem to figure out where it is adding the variables where it is putting the AND.
$words = explode(",", $_SESSION['form_state']['values']['filter']);
foreach($words as $word)
{
$or = db_or();
foreach($cols as $col)
{
$table = 'c';
if(in_array($col, array('completed_date', 'score')))
$table = 'cl';
elseif(in_array($col, array('name', 'mail')))
$table = 'u';
elseif($col == 'date')
$table = 'r';
elseif(in_array($col, array('announce', 'num_success_stories', 'num_action_steps'))) //can't put these in WHERE clause. Need to go in HAVING.
continue;
echo $word;
$or = $or->condition($table . '.' . $col, champs_make_like_sql($word), 'LIKE');
}
$result = $query->condition($or);
}