protected function dropIndexes()
	{
		if (! is_array($this->keys) || ! count($this->keys))
		{
			return;
		}

		foreach ($this->keys as $name => $key)
		{
			if ($key['type'] === 'primary' || $key['type'] === 'unique')
			{
				continue;
			}

			$this->db->query("DROP INDEX IF EXISTS '{$name}'");
		}
	}