function GridColumn(colDef, uid, grid) {
    var self = this;

    self.grid = grid;
    self.uid = uid;

    self.updateColumnDef(colDef, true);

    self.aggregationValue = undefined;

    // The footer cell registers to listen for the rowsRendered event, and calls this.  Needed to be
    // in something with a scope so that the dereg would get called
    self.updateAggregationValue = function() {

     // gridUtil.logDebug('getAggregationValue for Column ' + self.colDef.name);

      /**
       * @ngdoc property
       * @name aggregationType
       * @propertyOf ui.grid.class:GridOptions.columnDef
       * @description The aggregation that you'd like to show in the columnFooter for this
       * column.  Valid values are in
       * {@link ui.grid.service:uiGridConstants#properties_aggregationTypes uiGridConstants.aggregationTypes},
       * and currently include `uiGridConstants.aggregationTypes.count`,
       * `uiGridConstants.aggregationTypes.sum`, `uiGridConstants.aggregationTypes.avg`, `uiGridConstants.aggregationTypes.min`,
       * `uiGridConstants.aggregationTypes.max`.
       *
       * You can also provide a function as the aggregation type, in this case your function needs to accept the full
       * set of visible rows, and return a value that should be shown
       */
      if (!self.aggregationType) {
        self.aggregationValue = undefined;
        return;
      }

      var result = 0;
      var visibleRows = self.grid.getVisibleRows();

      var cellValues = function() {
        var values = [];
        visibleRows.forEach(function (row) {
          var cellValue = self.grid.getCellValue(row, self);
          var cellNumber = Number(cellValue);
          if (!isNaN(cellNumber)) {
            values.push(cellNumber);
          }
        });
        return values;
      };

      if (angular.isFunction(self.aggregationType)) {
        self.aggregationValue = self.aggregationType(visibleRows, self);
      }
      else if (self.aggregationType === uiGridConstants.aggregationTypes.count) {
        self.aggregationValue = self.grid.getVisibleRowCount();
      }
      else if (self.aggregationType === uiGridConstants.aggregationTypes.sum) {
        cellValues().forEach(function (value) {
          result += value;
        });
        self.aggregationValue = result;
      }
      else if (self.aggregationType === uiGridConstants.aggregationTypes.avg) {
        cellValues().forEach(function (value) {
          result += value;
        });
        result = result / cellValues().length;
        self.aggregationValue = result;
      }
      else if (self.aggregationType === uiGridConstants.aggregationTypes.min) {
        self.aggregationValue = Math.min.apply(null, cellValues());
      }
      else if (self.aggregationType === uiGridConstants.aggregationTypes.max) {
        self.aggregationValue = Math.max.apply(null, cellValues());
      }
      else {
        self.aggregationValue = '\u00A0';
      }
    };

//     var throttledUpdateAggregationValue = gridUtil.throttle(updateAggregationValue, self.grid.options.aggregationCalcThrottle, { trailing: true, context: self.name });

    /**
     * @ngdoc function
     * @name getAggregationValue
     * @methodOf ui.grid.class:GridColumn
     * @description gets the aggregation value based on the aggregation type for this column.
     * Debounced using scrollDebounce option setting
     */
    this.getAggregationValue =  function() {
//      if (!self.grid.isScrollingVertically && !self.grid.isScrollingHorizontally) {
//        throttledUpdateAggregationValue();
//      }

      return self.aggregationValue;
    };
  }
@ngdoc object
@name ui.grid.class:GridColumn
@description Represents the viewModel for each column.  Any state or methods needed for a Grid Column
are defined on this prototype
@param {ColumnDef} colDef the column def to associate with this column
@param {number} uid the unique and immutable uid we'd like to allocate to this column
@param {Grid} grid the grid we'd like to create this column in