How to add column with "table class"

Today I’ve got a problem when I use table class

I use table class for list data from database to table

I’ve 3 column eg.

ID | NAME | TEL | 1 aaa 001 2 bbb 002

everything work fines. but..

I want to add more column that “without mapping with database field” for edit and delete button, but I can’t

how I ?

ee()->table->set_columns(array(
      'calendar_topic_order'  => array('header' => 'ID'),
      'calendar_topic_name_th' => array('header' => 'Name'),
      'calendar_topic_name_en'  => array('header' => 'Tel'),
      // ''  => array('header' => 'Action', 'sort' => false) ???
  ));

Thankyou.