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                # Cumulative Sum Aggregation(累積匯總聚合) 警告 此功能是實驗性的,可能會在未來的版本中完全更改或刪除。Elastic將采取最大的努力來解決任何的問題,但是實驗功能不受SLA官方功能的支持。 父級管道聚合,計算父級直方圖(或日期直方圖)聚合中指定度量的累積和。指定的度量必須是數字,并且閉合min_doc_count直方圖必須設置為0(默認為histogram聚合)。 ## Syntax(語法) cumulative_sum聚合看起來像這樣: ``` { "cumulative_sum": { "buckets_path": "the_sum" } } ``` ## Table?10.?`cumulative_sum`?Parameters(Table 10.cumulative_sum參數) | 參數名稱 | 描述 | 是否必須 | 默認值 | | --- | --- | --- | --- | | `buckets_path` | 我們希望找到的數據的桶的路徑(相關詳細信息,請參閱“buckets_path Syntax”一節) | 必須 | ? | | `format` | 應用于此聚合的輸出值的格式 | 可選 | `null` | 以下代碼計算每月sales總額的累計總和: ``` POST /sales/_search { "size": 0, "aggs" : { "sales_per_month" : { "date_histogram" : { "field" : "date", "interval" : "month" }, "aggs": { "sales": { "sum": { "field": "price" } }, "cumulative_sales": { "cumulative_sum": { "buckets_path": "sales" #1 } } } } } } ``` | 1 | buckets_path指示這個為cumulatice sum聚合,以使用累積和來輸出sales聚合。 | 以下是響應信息: ``` { "took": 11, "timed_out": false, "_shards": ..., "hits": ..., "aggregations": { "sales_per_month": { "buckets": [ { "key_as_string": "2015/01/01 00:00:00", "key": 1420070400000, "doc_count": 3, "sales": { "value": 550.0 }, "cumulative_sales": { "value": 550.0 } }, { "key_as_string": "2015/02/01 00:00:00", "key": 1422748800000, "doc_count": 2, "sales": { "value": 60.0 }, "cumulative_sales": { "value": 610.0 } }, { "key_as_string": "2015/03/01 00:00:00", "key": 1425168000000, "doc_count": 2, "sales": { "value": 375.0 }, "cumulative_sales": { "value": 985.0 } } ] } } } ``` 原文鏈接 : [https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-pipeline-cumulative-sum-aggregation.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-pipeline-cumulative-sum-aggregation.html)(修改該鏈接為官網對應的鏈接) 譯文鏈接 : [http://www.apache.wiki/pages/viewpage.action?pageId=10030390](http://www.apache.wiki/pages/viewpage.action?pageId=10030390)(修改該鏈接為 **ApacheCN** 對應的譯文鏈接) 貢獻者 : [曾少峰](/display/~zengshaofeng),[ApacheCN](/display/~apachecn),[Apache中文網](/display/~apachechina)
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