What I really miss in the SimpleFaceting component is the ability to get facets not of the full term, but grouped by the first letter(s). I wrote a Jira issue on this ( https://issues.apache.org/jira/browse/SOLR-4496). I also wrote a patch with a rather simplistic first try of an implementation.
Now that I've had a better look at faceting multi valued fields and the inner working of UninvertedField, I see that doing it right is harder than I thought, but I'd still like to give it a try. So can anyone give me some tips on how to approach this? Should I treat the facet on the first letters as a completely independent field? Should I build the index based on the index of the complete field? By the nature of this kind of facet, you'll always have a fairly limited number of terms. Thanks a lot, Teun
