code: function moveSinksRight(nodes, maxDepth) {
      zrUtil.each(nodes, function (node) {
          if (!isNodeDepth(node) && !node.outEdges.length) {
              node.setLayout({depth: maxDepth}, true);
          }
      });
  }
docs: All the node without outEgdes are assigned maximum x-position and
  be aligned in the last column.
  
  @param {module:echarts/data/Graph~Node} nodes.  node of sankey view.
  @param {number} maxDepth.  use to assign to node without outEdges as x-position.