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Someone please give me a decent explanation of the difference between q and fq in Solr query, covering some points such as -
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Standard solr queries use the "q" parameter in a request. Filter queries use the "fq" parameter. The primary difference is that filtered queries do not affect relevance scores; the query functions purely as a filter (docset intersection, essentially). Follow this answer to receive notifications.
The fq (Filter Query) Parameter The fq parameter defines a query that can be used to restrict the superset of documents that can be returned, without influencing score. It can be very useful for speeding up complex queries, since the queries specified with fq are cached independently of the main query.
Solr provides Query (q parameter) and Filter Query (fq parameter) for searching. The query (q parameter), as the name suggests, is the main query used for searching. Example. q = title:james. Filter queries are used alongside query (q parameter) to limit results of queries using additional filters.
In the lucid works SOLR training they suggested you do multiple fq parameters instead of a single one joined with AND for performance reasons. So in the sample it would be q=*:*&fq=(catid:90 OR catid:81)&fq=priceEng:[38 TO 40]&fq=.... etc.
Standard solr queries use the "q" parameter in a request. Filter queries use the "fq" parameter.
The primary difference is that filtered queries do not affect relevance scores; the query functions purely as a filter (docset intersection, essentially).
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