function query($p_filter_input)
 {
     $is_billable = $p_filter_input[0];
     if (!is_numeric($is_billable)) {
         return;
     }
     plugin_push_current('CustomerManagement');
     if (access_has_global_level(plugin_config_get('view_customer_fields_threshold'))) {
         $t_query = CustomerManagementDao::buildFilterArrayForIsBillable($is_billable == 1 ? 1 : 0);
     }
     plugin_pop_current();
     return $t_query;
 }