If a rule must contain one aggregation, then you can compute additional aggregations on different columns in the same rule without impacting performance, as long as the grouping keys are the same.
如果规则必须包含一个聚合，那么可以在同一规则中，对不同列计算附加聚合，只要分组关键字相同，就不会影响性能。
If a rule must contain one aggregation, then you can compute additional aggregations on different columns in the same rule without impacting performance, as long as the grouping keys are the same.
如果规则必须包含一个聚合，那么可以在同一规则中，对不同列计算附加聚合，只要分组关键字相同，就不会影响性能。
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