materio-base-d7/sites/all/modules/contrib/ecommerce/ubercart/uc_order/views/uc_order_handler_filter_total.inc

<?php

/**
 * @file
 * Contains uc_order_handler_filter_total.
 */

/**
 * Filter handler that handles fields generated by table.fieldname * table.qty.
 *
 * This extends views_handler_filter_group_by_numeric because the field is an
 * alias for a formula.  WHERE clauses can't use aliases.  Extending it this
 * way uses a HAVING clause instead, which does work.
 *
 * This filter handler is appropriate for any numeric formula that ends up
 * in the query with an alias like "table_field".
 */
class uc_order_handler_filter_total extends views_handler_filter_group_by_numeric {

  /**
   * Overrides views_handler_filter_group_by_numeric::query().
   */
  function query() {
    $this->ensure_my_table();
    $field = $this->table . '_' . $this->field;

    $info = $this->operators();
    if (!empty($info[$this->operator]['method'])) {
      $this->{$info[$this->operator]['method']}($field);
    }
  }

}