: Have a look at SOLR (*lucene.apache.org/solr*). It is based on Lucene and : provides additional functionalities including faceted search.
to more generally answer you question: while you may not find a lot of info searching for "lucene histogram" you should find loots of info about achieving getting the type of info you want (using either Solr or lucene) by searching the web and mailing list archives for info about "faceted search" ... it also gets asked about quite about under the name "category counts" -Hoss --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]