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Funnel阶段Funnel阶段是一个处理阶段它将多个输入数据集复制到单个数据集该操作对于将单独数据集合并到单个大型数据集而言非常有用该阶段可以有众多输入链接和一个输出链接Funnel阶段能够以下列三种方式之一运行：连续传送以不可保证顺序合并输入数据的记录它依次从每个输入链接获取一条记录如果输入链接上的数据不可用那么该阶段会跳至下一个链接而不是等待排序传送按照一个或多个键列的值定义的顺序合并