The new aggregation information is updated in the aggregate object.
新的聚集信息在聚集对象中更新。
Finally, the aggregation information for a certain group can be retrieved and updated.
最后，我们可以获取和更新特定分组的聚集信息。
Both approaches maintain a list of objects where each object in the list manages the aggregation information for exactly one group.
这两种方法各自维护了一个对象列表，其中的每一个对象都负责管理每一个具体分组的聚集信息。
With the group information, we can identify the correct aggregation information and calculate the final result that shall be returned.
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。
We use an attribute for a list of intermediate results, where one element of the list represents the aggregation information for one group.
可用一个属性保存中间结果列表，其中的每一个元素都代表一个分组的聚集信息。
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.
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。
Those objects are similar to the AggregateGroup used in the first section, and they keep track of the aggregation information for each group that is processed by the UDF.
这些对象与第一节中使用的AggregateGroup类似，也跟踪记录udf所处理的每一个分组的聚集信息。
Referring to our example, the aggregation information needs to contain the weighted sum of all values passed in so far (for that group) and the count for the number of values already processed.
按照例子的要求，聚集信息需要保存目前为止所有（该组）传入值的加权和，并保存已经处理过的数值的数量。
Referring to our example, the aggregation information needs to contain the weighted sum of all values passed in so far (for that group) and the count for the number of values already processed.
按照例子的要求，聚集信息需要保存目前为止所有（该组）传入值的加权和，并保存已经处理过的数值的数量。
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