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

[G Fernandes (JIRA)]

Support for faceting search results
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                 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


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?


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