使用codeigniter在group by查询中添加多个计数

$this->load->database();
$this->load->library('db_query_builder');
$this->load->model('your_model');

public function get_counts() {
    $this->db->select('column1, column2, COUNT(*) as count1');
    $this->db->select_max('column3', 'max_value');
    $this->db->select_min('column4', 'min_value');
    $this->db->from('your_table');
    $this->db->group_by('column1, column2');
    return $this->db->get()->result();
}

$this->load->model('your_model');
$results = $this->your_model->get_counts();

foreach ($results as $result) {
    echo $result->column1;
    echo $result->column2;
    echo $result->count1;
    echo $result->max_value;
    echo $result->min_value;
}