有了分组信息之后，我们就可以识别出正确的聚集信息，并计算最终应该返回的结果。

With the group information, we can identify the correct aggregation information and calculate the final result that shall be returned.

youdao

现在，我们可从当前分组（或一个新开始的分组）中获得聚集信息，并将分组信息和传递给 UDF 的参数结合起来。

Now we get the aggregation information for the current group (or start a new group) and combine that group information with the parameters that were passed in to the UDF.

youdao

Gist是一个Web服务，可以将他们聚集在一起，甚至从网络端提取联系信息，帮助你更新重要联系人的信息。

Gist is a Web service that can bring them together and even pull in stuff from the Web to help you stay up to date with your most important contacts.

youdao

You have nothing that identifies that there, you have no way of saying what this grouping actually means.

我仅仅用了一个数组，就把信息聚集到一起了,假设我给了你。

麻省理工公开课 - 计算机科学及编程导论课程节选

Right, and just to get a sense of this, let's look at a simple little example, so on your hand-out, you'll see I've got a little piece of code that says assuming I've got one of these points, I want to do things with it, for example I might want to add them together.

这些数组中的一个，你怎么能够知道，它是哪种类型的呢？,你怎么知道它是以笛卡尔坐标,表示的还是以极坐标,形式表示的呢？,你没有可以用来区分的东西，你没有说明这种信息,聚集实际上的意义。

麻省理工公开课 - 计算机科学及编程导论课程节选