From a5ae91c6d2acc898ce8157a95f83073b7f0937e8 Mon Sep 17 00:00:00 2001
From: zhangxiaoli73 <380761639@qq.com>
Date: Mon, 23 Oct 2017 10:45:34 +0800
Subject: [PATCH] add toGraph (#1189)

* add toGraph

* refactor toGraph

* add getEndNodes for ParallelTable, MapTable

* add unit test