Queries can be used in query context, and filters can be used in filter context.
When used in filtering context, the query is said to be a “non-scoring” or “filtering” query. That is, the query simply asks the question: “Does this document match?”. The answer is always a simple, binary yes|no.
- Is the lastModified date in the range
2016–2017? - is document ids in the range 1 -100 ?
- Does the
subjectfield contain the term solr? - Is the
lat_lonfield within 20kmof a specified point?
Solr provide facility to execute multiple filter query in a single query request by specifying multiple fq params.
Table of Contents
Multiple filter queries example:
http://localhost:8983/solr/multiplefilterqueryexample/query?q=*:*&fq=popularity:[6 TO 10]&fq=DOC_ID:[1 TO 100]&fq=FROM:"[email protected]"&rows=10&indent=true
In above example we have added three filter queries by adding fq params three times.
Solrj Example:
HttpSolrServer solr = new HttpSolrServer("http://localhost:8983/solr/multiplefilterqueryexample");
SolrQuery query = new SolrQuery();
query.setQuery("*:*"); //main query
query.addFilterQuery("DOC_ID:[1 TO 100]","FROM:[email protected]","popularity:[6 TO 10]"); //filter query , we can pass multiple queries
query.setFields("DOC_ID","HITS","CAT");
query.set("defType", "edismax");
query.setStart(0);
QueryResponse response = solr.query(query);
SolrDocumentList results = response.getResults();
for (int i = 0; i < results.size(); ++i) {
System.out.println(results.get(i));
}Refer main-query-vs-filter-query , CommonQueryParameters for more details.
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