elasticsearch - 使用 elasticsearch 的嵌套 SQL 选择

Question

我怎样才能在elasticsearch中写这个：

    SELECT avg(sum) 
    FROM (
         SELECT sum(rev) as sum
         FROM table
         GROUP BY user_id
    )

Answer 1

如果您使用的 ES 版本是 2.x，请使用Avg Bucket Aggregation

{

"aggs": {
  "group_by_user": {
     "terms": {
        "field": "userId"
     },
     "aggs": {
        "rev_sum": {
           "sum": {
              "field": "rev"
           }
        }
     }
  },
  "avg_monthly_sales": {
     "avg_bucket": {
        "buckets_path": "group_by_user>rev_sum"
       }
     }
   }
 }

希望能帮助到你