: I don't think so. I looked at sources - range and query facets are backed : on SolrIndexSearcher.numDocs(Query, DocSet).
on fields that use docValues, range queries (regardless of wether they are come from q, fq, facet.query, facet.range) are sometimes implemented using the docValues via that FieldType's getRangeQuery(). The specifics of when the docValues are used depend on other field type properties (ie: multiValued? , indexed? , numeric?) but the bottom line is if you do range faceting on a field, the same query will be used for filtering on thatfiled, so you should get a filterCache hit. -Hoss
