Should we should detect the case of all negative clauses and throw in a MatchAllDocsQuery?
I guess this would be done in the QueryParser, but one could also make a case for doing it in the BooleanQuery. -Yonik On 1/6/06, Erik Hatcher <[EMAIL PROTECTED]> wrote: > With Lucene's trunk, there is a MatchAllDocsQuery. You could use > this in a BooleanQuery with your negative-only query. > > Another option, if you're at Lucene 1.4.3 is to index the same value > for a dummy field for every document (say like "dummy:all") and use a > TermQuery in a BooleanQuery with the negative-only query. > > As for BitSet's, if you need to go that route a QueryFilter would > give you the BitSet back that you could easily complement, but that > might be a bit overkill for what you need given the option above. > > Erik > > > On Jan 6, 2006, at 12:04 PM, Beady Geraghty wrote: > > > I would like to do queries that are negative. I mean a query with > > only negative terms and phrases. For example, retrieve all > > documents that do not contain the term "apple". > > > > For now, I have a limited set of documents (say, 10000) to index. > > I can create a bitset that represents the search result of hits on > > "apple". > > Then I complement (XOR) the result. > > Each bit corresponds to a document ID. > > My question is : > > Inside Lucene, are the hits represented in some form of a bitset. > > Can I get at it directly. I saw the BitSet class. (I now use > > Java's Bitset class). > > Assuming that hits are internally represented as bitset, for a > > small number of documets, the bitset won't be very big, > > and if there are plenty of hits and many many more documents, > > is the bitset still kept entirely > > in memory as well ? > > > > Thank you > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
