[hibernate-issues] [Hibernate-JIRA] Commented: (HSEARCH-623) Support for faceting search results

Support for faceting search results ----------------------------------- Key: HSEARCH-623 URL: http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-623 Project: Hibernate Search Issue Type: New Feature Components: engine Reporter: G Fernandes Assignee: G Fernandes I've been asked more than once about the possibility to support facet retrieval from the search results. The idea is to categorize the results of a query into buckets containing a label plus a number of occurrences. Consider an example: I have a Book entity containing a language field. When I search for Books, I'd like to obtain not only a List<Book>, but also a list of languages and how many books from the search results fit into each of these languages, so that I can render the results as: Found 17 Books: English (10) Italian (5) Spanish (2) It'd be also possible to facet on more than a field at the same time, similar to what's being done with projections. Facet calculation would be done at query time reading directly from the index, probably by using a plugable strategy, examples would be LuceneFieldCacheStrategy and TermEnumStrategy. Asking for facets would be done at API level, probably with a decorator on top of QueryBuilder something like facetQueryBuilder.facetOn("field1").facetOn("field2").results().facets(); WDYT?