I think what Tomislav was trying to ask is: Can filters replace only strictly boolean clauses (i.e. only MUST and MUST_NOT), such as: +gender:F, -rating:xxx)? Or can filters also replace SHOULD clauses, such as: food:banana (which is neither absolutely required or strictly prohibited)?
Otis ---- Sematext :: http://sematext.com/ :: Solr - Lucene - Nutch Lucene ecosystem search :: http://search-lucene.com/ ----- Original Message ---- > From: Erick Erickson <[email protected]> > To: [email protected] > Sent: Fri, May 7, 2010 8:30:18 PM > Subject: Re: TermsFilter instead of "should" TermQueries > > Well, you construct the filter by enumerating the terms you're interested in > and pass it along to the relevant search. But it looks like you've > figured that part out. If you're asking how can you use a Filter and still > have the terms replaced by the filter contribute to scoring, you can't. But > it's a reasonable question to ask whether it changes the score enough > to matter given that this is only a problem when there are > many terms. If this doesn't speak to your question, can you ask for > more detail? HTH Erick On Fri, May 7, 2010 at 1:19 PM, > Tomislav Poljak < > href="mailto:[email protected]";>[email protected]> wrote: > > Hi, > in API documentation for TermsFilter: > > > > href="http://search-lucene.com/jd/lucene/org/apache/lucene/search/TermsFilter.html"; > > target=_blank > >http://search-lucene.com/jd/lucene/org/apache/lucene/search/TermsFilter.html > > > it states: > > 'As a filter, this is much faster than the equivalent > query (a > BooleanQuery with many "should" TermQueries)' > > I > would like to replace "should" TermQueries with TermsFilter to benefit > > in performance, but I'm trying to understand how this change/switch can > > work. > > I was under the impression that the BooleanQuery with many > "should" > TermQueries affects scoring like: each "should" term present in > result, > increases the result's score. > > If someone could > explain how can a TermsFilter (which is like any filter > a binary thing - > result document is matched or not) be used to replace > should clauses, I > would really appreciate it. > > Tomislav > > > > --------------------------------------------------------------------- > To > unsubscribe, e-mail: > href="mailto:[email protected]";>[email protected] > > For additional commands, e-mail: > ymailto="mailto:[email protected]"; > href="mailto:[email protected]";>[email protected] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
