/**
* Add an index
*
* @param string $table_name the name of the table
* @param string $column_name the column name
* @param array|string $options
*
* @return boolean
*/
public function add_index($table_name, $column_name, $options = array())
{
return $this->_adapter->add_index($table_name, $column_name, $options);
}
