聚合可以做什么? count avg filter and count 每月新增 top 是否存在不正常或不符合规则的数据 关键概念 Buckets group by 将数据按某种标准划分成不同集合 桶嵌套: Cincinnati would be placed inside the Ohio state bucket, and the entire Ohio bucket would be placed inside the USA country bucket. Metrics count.…