Chris, That was partially what I needed. You got it right when I said I needed the number of categories that I particular term appears (and it works). But, I also would like to know in how many documents in each category that term appears.
For instance: title:lucene appears in the category "search engines" and "open source software", and it appears in the documents 1, 2 and 3 in the category "search engines" and in documents 4 and 7 in the categoy "open source". I could not get it to work yet (maybe because of my lack of experience with Lucene). Someone could give me a hand??? Thanks Pablo On 4/24/05, Chris Hostetter <[EMAIL PROTECTED]> wrote: > > : >I have indexed a field that describes the "category" of the document. > : >Thus, I want to know how many categories have a specific term. Could > : >someone help me to get this with good performance? > > I think I'm reading this question different than Chuck, so I'll toss out > somethign totally different... > > as I understand it, you've indexed a bunch of documents, with a variety of > fields, one of which is "category" (for example, maybe you are indexing > news articles, that each have a "title", "description", "url", and > "category"). Now you have a term like "title:lucene" (or > "description:pope") and you want to know the number of unique terms in the > category field that exist in articles that contain your input term. > > If that's what you're looking for, then you can problem achieve this by: > 1) make a TermQuery for your input term (ie: "title:lucene") > 2) put that TermQuery in a QueryFilter, and call bits(reader) > 3) call FieldCache.DEFAULT.getStrings(reader,"category") > 3) loop over the true bits in the BitSet from #3, and for each one, add > the corrisponding entry from the String[] in #4 to a Set. > > when you're all done, the Set will be the list of categories, and the size > of that Set is the number (i think) you wanted. > > (DISCLAIMER: I've never acctaully used FieldCache, i'm just giving you my > advice based on reading the javadocs) > > -Hoss > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > -- Pablo Gomes Ludermir [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
