标签：cat rop ref 嵌套类 封装 res 数据 获取 info
嵌套类型的基本概念就不讲了,需要了解概念的,传送门:https://www.cnblogs.com/just84/p/10936034.html
对于嵌套类型的字段,要使用ES专用的嵌套查询
嵌套字段举例:
brandInfo:[
? {
? "group": "xx",
? "category": "xx",
? "subCategory": "xx",
? "brand": "xx",
? "subBrand": "xx",
? "propertyWord": [
? "xx",
? "xx",
? "xx"
? ]
? }
]
如果要获取subBrand的分组 就需要这样实现:
"aggs": {
"brandInfo": {
"nested": {
"path": "brandInfo"
},
"aggs": {
"brands": {
"terms": {
"field": "brandInfo.subBrand",
"size": xx
}
}
}
}
}
如果要在subBrand分组的条件上,进行propertyWord的分组,也很简单:
"aggs": {
"brandInfo": {
"nested": {
"path": "brandInfo"
},
"aggs": {
"brands": {
"terms": {
"field": "brandInfo.subBrand",
"size": 10
},
"aggs": {
"property": {
"terms": {
"field": "brandInfo.propertyWord",
"size": 100
}
}
}
}
}
}
}
需求往往是多变的
如果突然在subBrand的分组下,还要进行 非嵌套字段 的分组,比如名称,性别,年龄等,如何实现呢?
这个时候一般都会想,和上边一样呗,如下:
"aggs": {
"brandInfo": {
"nested": {
"path": "brandInfo"
},
"aggs": {
"brands": {
"terms": {
"field": "brandInfo.subBrand",
"size": 3
},
"aggs": {
"gender": {
"terms": {
"field": "gender",
"size": 3
}
}
}
}
}
}
}
但这样是查不到性别分组数据的
原因是: 进入了嵌套桶中,只能操作嵌套字段.
后来了解到,可以通过 reverse_nested 跳出当前嵌套,并且 依然携带之前的分组条件
"aggs": {
"brandInfo": {
"nested": {
"path": "brandInfo"
},
"aggs": {
"brands": {
"terms": {
"field": "brandInfo.subBrand",
"size": 3
},
"aggs": {
"rev": {
"reverse_nested": {}, //跳出嵌套桶
"aggs": {
"age": {
"terms": {
"field": "gender",
"size": 3
}
}
}
}
}
}
}
}
}
问题解决.
用java实现也很简单,相关的嵌套和跳出嵌套代码片段:
//解析嵌套字段 Map<String, Aggregation> brandInfo =((Nested) result.get("brandInfo")).getAggregations().getAsMap(); //品牌 List<Terms.Bucket> bucketList = ((Terms) brandInfo.get("brands")).getBuckets(); for (Terms.Bucket bucket : bucketList) { //跳出嵌套 Map<String, Aggregation> revInfo =((ReverseNested) bucket.getAggregations().get("rev")).getAggregations().getAsMap(); //一级维度 List<Terms.Bucket> genders = ((Terms) revInfo.get("gender")).getBuckets(); //封装数据 for (Terms.Bucket gender : genders) { //TODO } }
[ElasticSearch]ES操作之嵌套查询(nested)与退出嵌套(reverse_nested)操作
标签：cat rop ref 嵌套类 封装 res 数据 获取 info
原文地址：https://www.cnblogs.com/nysd/p/12932675.html
