code: function() {
          var hierarchyList = this._getColumnHierarchyList();
          var maxRowCount = this._getHierarchyMaxRowCount(hierarchyList);
          var rowHeight = util.getRowHeight(maxRowCount, this.headerHeight) - 1;
          var handleHeights = [];
          var index = 1;
          var coulmnLen = hierarchyList.length;
          var sameColumnCount, handleHeight;
  
          for (; index < coulmnLen; index += 1) {
              sameColumnCount = getSameColumnCount(hierarchyList[index], hierarchyList[index - 1]);
              handleHeight = rowHeight * (maxRowCount - sameColumnCount);
  
              handleHeights.push(handleHeight);
          }
  
          handleHeights.push(rowHeight * maxRowCount); // last resize handle
  
          return handleHeights;
      }
docs: Get height values of resize handlers
  @returns {array} Height values of resize handles