docs: function createOrUpdateBarRect(bar, symbolMeta, isUpdate) {
      var rectShape = zrUtil.extend({}, symbolMeta.barRectShape);
  
      var barRect = bar.__pictorialBarRect;
      if (!barRect) {
          barRect = bar.__pictorialBarRect = new graphic.Rect({
              z2: 2,
              shape: rectShape,
              silent: true,
              style: {
                  stroke: 'transparent',
                  fill: 'transparent',
                  lineWidth: 0
              }
          });
  
          bar.add(barRect);
      }
      else {
          updateAttr(barRect, null, {shape: rectShape}, symbolMeta, isUpdate);
      }
  }