概述
继续跟中华石杉老师学习ES,第41篇
课程地址: https://www.roncoo.com/view/55
官方说明
Filter Aggregation:戳这里
案例
需求: 统计牌品最近一个月的平均价格
今天是 2019-08-24 ,为了演示该案例,我们批量更新下数据
代码语言:javascript复制POST /tvs/sales/_bulk
{"update":{"_id":"3n0msmwBYSg4rD-7WPab"}}
{"doc":{"sold_date":"2019-07-30"}}
{"update":{"_id":"4H0msmwBYSg4rD-7WPab"}}
{"doc":{"sold_date":"2019-01-05"}}
{"update":{"_id":"4n0msmwBYSg4rD-7WPab"}}
{"doc":{"sold_date":"2019-04-12"}}
{"update":{"_id":"230msmwBYSg4rD-7WPaa"}}
{"doc":{"sold_date":"2019-03-28"}}
{"update":{"_id":"3X0msmwBYSg4rD-7WPab"}}
{"doc":{"sold_date":"2019-05-20"}}
{"update":{"_id":"3H0msmwBYSg4rD-7WPab"}}
{"doc":{"sold_date":"2019-06-05"}}
{"update":{"_id":"330msmwBYSg4rD-7WPab"}}
{"doc":{"sold_date":"2019-08-02"}}
{"update":{"_id":"4X0msmwBYSg4rD-7WPab"}}
{"doc":{"sold_date":"2019-07-30"}}
更新后的数据:
DSL:
代码语言:javascript复制#统计牌品最近一个月的平均价格
GET /tvs/sales/_search
{
"query": {
"term": {
"brand": "TCL"
}
},
"aggs": {
"recent_30d": {
"filter": {
"range": {
"sold_date": {
"gte": "now-30d"
}
}
},
"aggs": {
"recent_30d_price": {
"avg": {
"field": "price"
}
}
}
}
},
"size": 0
}
返回
分析一下:
aggs.filter,针对的是聚合。
为什么不把filter放在query里呢? 如果放query里面的filter,是全局的,会对所有的数据都有影响 。
但是假设你要统计TCL电视,最近1个月的平均值; 最近3个月的平均值; 最近6个月的平均值
那就需要对bucket 进行 filter:对不同的bucket下的aggs,进行filter
代码语言:javascript复制#统计牌品最近一个月的平均价格
GET /tvs/sales/_search
{
"query": {
"term": {
"brand": "TCL"
}
},
"aggs": {
"recent_30d": {
"filter": {
"range": {
"sold_date": {
"gte": "now-30d"
}
}
},
"aggs": {
"recent_30d_price": {
"avg": {
"field": "price"
}
}
}
},
"recent_90d":{
"filter": {
"range": {
"sold_date": {
"gte": "now-90d"
}
}
},
"aggs": {
"recent_90d_price": {
"avg": {
"field": "price"
}
}
}
},
"recent_180d":{
"filter": {
"range": {
"sold_date": {
"gte": "now-180d"
}
}
},
"aggs": {
"recent_180d_price": {
"avg": {
"field": "price"
}
}
}
}
}
}
返回:
代码语言:javascript复制{
"took": 12,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 2,
"max_score": 0.9808292,
"hits": [
{
"_index": "tvs",
"_type": "sales",
"_id": "330msmwBYSg4rD-7WPab",
"_score": 0.9808292,
"_source": {
"price": 1200,
"color": "绿色",
"brand": "TCL",
"sold_date": "2019-08-02"
}
},
{
"_index": "tvs",
"_type": "sales",
"_id": "3n0msmwBYSg4rD-7WPab",
"_score": 0.6931472,
"_source": {
"price": 1500,
"color": "蓝色",
"brand": "TCL",
"sold_date": "2019-07-30"
}
}
]
},
"aggregations": {
"recent_30d": {
"doc_count": 2,
"recent_30d_price": {
"value": 1350
}
},
"recent_90d": {
"doc_count": 2,
"recent_90d_price": {
"value": 1350
}
},
"recent_180d": {
"doc_count": 2,
"recent_180d_price": {
"value": 1350
}
}
}
}