使用SolrJ和Solr4进行刻面 [英] Faceting using SolrJ and Solr4

问题描述

我已经浏览了本网站上的相关问题但未找到相关解决方案。

I've gone through the related questions on this site but haven't found a relevant solution.

使用表单的HTTP请求查询我的Solr4索引时

When querying my Solr4 index using an HTTP request of the form

&facet=true&facet.field=country

回复包含所有不同的国家/地区以及每个国家/地区的计数。

The response contains all the different countries along with counts per country.

如何使用SolrJ获取此信息？
我尝试过以下操作，但它只返回所有国家/地区的总计数，而不是每个国家/地区：

How can I get this information using SolrJ? I have tried the following but it only returns total counts across all countries, not per country:

solrQuery.setFacet(true);
solrQuery.addFacetField("country");

以下似乎有效，但我不想事先明确设置所有分组：

The following does seem to work, but I do not want to have to explicitly set all the groupings beforehand:

solrQuery.addFacetQuery("country:usa");
solrQuery.addFacetQuery("country:canada");

其次，我不确定如何从QueryResponse对象中提取构面数据。

Secondly, I'm not sure how to extract the facet data from the QueryResponse object.

所以有两个问题：

1）使用SolrJ如何在一个字段上进行分面并返回分组而不明确指定组？

1) Using SolrJ how can I facet on a field and return the groupings without explicitly specifying the groups?

2）使用SolrJ如何从QueryResponse对象中提取构面数据？

2) Using SolrJ how can I extract the facet data from the QueryResponse object?

谢谢。

更新：

我也尝试了类似谢尔盖的回复（下方） 。

I also tried something similar to Sergey's response (below).

List<FacetField> ffList = resp.getFacetFields();
log.info("size of ffList:" + ffList.size());
for(FacetField ff : ffList){
    String ffname = ff.getName();
    int ffcount = ff.getValueCount();
    log.info("ffname:" + ffname + "|ffcount:" + ffcount);           
}

上面的代码显示了大小= 1的ffList，循环经历了1次迭代。在输出ffname =country中，ffcount是与原始查询匹配的总行数。

The above code shows ffList with size=1 and the loop goes through 1 iteration. In the output ffname="country" and ffcount is the total number of rows that match the original query.

这里没有按国家/地区细分。

There is no per-country breakdown here.

我应该在同一个solrQuery对象上提到我还调用addField和addFilterQuery。不确定这是否会影响分面：

I should mention that on the same solrQuery object I am also calling addField and addFilterQuery. Not sure if this impacts faceting:

solrQuery.addField("user-name");
solrQuery.addField("user-bio");
solrQuery.addField("country");
solrQuery.addFilterQuery("user-bio:" + "(Apple OR Google OR Facebook)");

更新2：

我想我得到了它，再次基于谢尔盖在下面说的话。我使用FacetField.getValues（）提取了List对象。

I think I got it, again based on what Sergey said below. I extracted the List object using FacetField.getValues().

List<FacetField> fflist = resp.getFacetFields();
for(FacetField ff : fflist){
    String ffname = ff.getName();
    int ffcount = ff.getValueCount();
    List<Count> counts = ff.getValues();
    for(Count c : counts){
        String facetLabel = c.getName();
        long facetCount = c.getCount();
    }
}

在上面的代码中，label变量与每个facet组匹配和count是该分组的相应计数。

In the above code the label variable matches each facet group and count is the corresponding count for that grouping.

推荐答案

实际上你只需要设置facet字段并激活facet（检查SolrJ源代码）：

Actually you need only to set facet field and facet will be activated (check SolrJ source code):

solrQuery.addFacetField("country");

您在哪里寻找方面信息？它必须在 QueryResponse.getFacetFields （ getValues.getCount ）

Where did you look for facet information? It must be in QueryResponse.getFacetFields (getValues.getCount)

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