elasticSearch有类似mysql的groupConcat语法吗,举个例子
时间: 2024-03-11 22:48:25 浏览: 179
是的,Elasticsearch中有类似MySQL的group_concat语法,可以使用terms aggregation与script aggregation结合使用来实现。下面是一个示例:
假设有以下数据:
```
{
"name": "John",
"colors": ["red", "green", "blue"]
},
{
"name": "Jane",
"colors": ["red", "yellow"]
},
{
"name": "Bob",
"colors": ["blue"]
}
```
我们可以使用以下查询来获取每个人所喜欢的颜色的列表:
```
GET /my_index/_search
{
"size": 0,
"aggs": {
"people": {
"terms": {
"field": "name"
},
"aggs": {
"colors": {
"scripted_metric": {
"init_script": "state.colors = []",
"map_script": "state.colors.addAll(doc['colors'])",
"combine_script": "return state.colors",
"reduce_script": "def colors = []; for (states in states) { colors.addAll(states) }; return colors.unique()"
}
}
}
}
}
}
```
上述查询将返回以下结果:
```
{
"aggregations": {
"people": {
"buckets": [
{
"key": "John",
"doc_count": 1,
"colors": [
"red",
"green",
"blue"
]
},
{
"key": "Jane",
"doc_count": 1,
"colors": [
"red",
"yellow"
]
},
{
"key": "Bob",
"doc_count": 1,
"colors": [
"blue"
]
}
]
}
}
}
```
其中,"colors"字段返回每个人所喜欢的颜色的列表,类似于MySQL的group_concat函数。
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