This section describes the process of creating a mediation component that includes aggregation logic.

这一部分将介绍创建包含聚合逻辑的中介组件的过程。

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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。

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The standard query operator methods that perform aggregation operations are listed in the following section.

以下部分列出了执行聚合运算的标准查询运算符方法。

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