Sorting Solr刻面等价于group by？

如果我有这样的数据：

{"field1":"x", "field2":".."}
{"field1":"x", "field2":".."}
{"field1":"y", "field2":".."}
{"field1":"y", "field2":".."}
{"field1":"y", "field2":".."}

{
  "responseHeader":{..}
  "grouped":{
        "field1": {
            "matches": 5,
            "groups": [

                {"groupValue": "x", "doclist":{"numFound": 2, ...}}
                {"groupValue": "y", "doclist":{"numFound": 3, ...}}

            ]
        }

  }
}

使用简单的

group=true&group.field=field1&group.limit=0

我得到如下结果：

{"field1":"x", "field2":".."}
{"field1":"x", "field2":".."}
{"field1":"y", "field2":".."}
{"field1":"y", "field2":".."}
{"field1":"y", "field2":".."}

{
  "responseHeader":{..}
  "grouped":{
        "field1": {
            "matches": 5,
            "groups": [

                {"groupValue": "x", "doclist":{"numFound": 2, ...}}
                {"groupValue": "y", "doclist":{"numFound": 3, ...}}

            ]
        }

  }
}

使用此函数，我知道为每个

groupValue

（

numFound

）找到的文档数。问题是我需要按降序对结果组进行排序，这两种排序都不可能（简单的

sort=numFound

将导致异常，即字段

numFound

不存在，而group.sort将对每个组内的文档进行排序）

使用facets是否有类似的方法，我可以通过计数对结果进行排序？

您可以尝试：

http://localhost:8983/solr/your_core/select?facet.field=field1&facet.sort=count&facet.limit=-1&facet=on&indent=on&q=*:*&rows=0&start=0&wt=json

结果将类似于：

{
  "responseHeader":{
    "status":0,
    "QTime":17,
    "params":{
      "q":"*:*",
      "facet.field":"field1",
      "indent":"on",
      "start":"0",
      "rows":"0",
      "facet":"on",
      "wt":"json"}},
  "response":{"numFound":225364,"start":0,"docs":[]
  },
  "facet_counts":{
    "facet_queries":{},
    "facet_fields":{
      "field1":[
        "x",113550,
        "y",111814]},
    "facet_ranges":{},
    "facet_intervals":{},
    "facet_heatmaps":{}
  }
}

{
  "responseHeader":{
    "status":0,
    "QTime":614,
    "params":{
      "facet.limit":"10",
      "q":"*:*",
      "facet.field":"field1",
      "indent":"on",
      "stats":"true",
      "start":"0",
      "rows":"0",
      "facet":"true",
      "wt":"json",
      "facet.sort":"count",
      "stats.field":"{!cardinality=true}field1"}},
  "response":{"numFound":2336315,"start":0,"docs":[]
  },
  "facet_counts":{
    "facet_queries":{},
    "facet_fields":{
      "field1":[
        "Value1",708116,
        "Value2",607088,
        "Value3",493949,
        "Value4",314433,
        "Value5",104478,
        "Value6",41099,
        "Value7",28879,
        "Value8",18767,
        "Value9",9308,
        "Value10",4545]},
    "facet_ranges":{},
    "facet_intervals":{},
    "facet_heatmaps":{}},
  "stats":{
    "stats_fields":{
      "field1":{
        "cardinality":27}}}}

刚刚用Solr 6.3.0进行了测试

有关更多信息，请查看中的相关零件

如果要同时计算可用面的数量，可以使用Solr

stats

Component（因为字段的类型为numeric、string或date）。
但请记住，可能会出现服务器性能和内存开销问题

运行如下查询：

http://localhost:8983/solr/your_core/select?facet.field=field1&facet.sort=count&facet.limit=10&facet=true&indent=on&q=*:*&rows=0&start=0&wt=json&stats=true&stats.field={!cardinality=true}field1

答案是这样的：

{
  "responseHeader":{
    "status":0,
    "QTime":17,
    "params":{
      "q":"*:*",
      "facet.field":"field1",
      "indent":"on",
      "start":"0",
      "rows":"0",
      "facet":"on",
      "wt":"json"}},
  "response":{"numFound":225364,"start":0,"docs":[]
  },
  "facet_counts":{
    "facet_queries":{},
    "facet_fields":{
      "field1":[
        "x",113550,
        "y",111814]},
    "facet_ranges":{},
    "facet_intervals":{},
    "facet_heatmaps":{}
  }
}

{
  "responseHeader":{
    "status":0,
    "QTime":614,
    "params":{
      "facet.limit":"10",
      "q":"*:*",
      "facet.field":"field1",
      "indent":"on",
      "stats":"true",
      "start":"0",
      "rows":"0",
      "facet":"true",
      "wt":"json",
      "facet.sort":"count",
      "stats.field":"{!cardinality=true}field1"}},
  "response":{"numFound":2336315,"start":0,"docs":[]
  },
  "facet_counts":{
    "facet_queries":{},
    "facet_fields":{
      "field1":[
        "Value1",708116,
        "Value2",607088,
        "Value3",493949,
        "Value4",314433,
        "Value5",104478,
        "Value6",41099,
        "Value7",28879,
        "Value8",18767,
        "Value9",9308,
        "Value10",4545]},
    "facet_ranges":{},
    "facet_intervals":{},
    "facet_heatmaps":{}},
  "stats":{
    "stats_fields":{
      "field1":{
        "cardinality":27}}}}

---

有关

stats

的更多信息，您可以查看。

我也尝试过，而且，我事先没有提到，但实际上我有很多结果。我可以使用

facet.offset

和

facet.limit

翻阅结果，但Solr不会打印组数（就像分组那样）。您知道获得（方面结果的）总计数的方法吗？您想在一个查询中获得所有方面（组）以及相关计数吗？如果是这样，您可以使用facet.limit=-1。如果您想要结果的总计数，您不能只使用

response

的

numFound

属性吗？@Izagkaretos不幸的是，我需要根据结果创建一个可分页的表。numFound表示找到的文档数，而不是字段合并后创建的组数。好的，faceted方法中缺少的所需信息是Facet的总数？是的，我需要知道Facet的数量以判断哪一页是最后一页，否则我只知道当前页，我甚至不知道是否有下一页，只是在查询之后。