Other use is for custom Query objects to reboost or expand the user query from information gathered from the indexreader at search time. -John
On Mon, Apr 7, 2008 at 2:56 PM, Paul Elschot <[EMAIL PROTECTED]> wrote: > Itamar, > > Query rewrite replaces wildcards with terms available from > the index. Usually that involves replacing a wildcard with a > BooleanQuery that is an effective OR over the available > terms while using a flat coordination factor, i.e. it does not > matter how many of the available terms actually match > a document, as long as at least one matches. > > For the required query parts (AND like), Scorer.skipTo() > is used, and that could well be the filter mechanism you > are referring to; have a look at the javadocs of Scorer, > and, if necessary, at the actual code of ConjunctionScorer. > > Regards, > Paul Elschot > > > > > > Op Monday 07 April 2008 23:13:09 schreef Itamar Syn-Hershko: > > Hi all, > > > > Can someone from the experts here explain why Lucene has to get a > > "rewritten" query for the Searcher - so Phrase or Wildcards queries > > have to rewrite themselves into a "primitive" query, that is then > > passed to Lucene to look for? I'm probably not familiar too much with > > the internals of Lucene, but I'd imagine that if you can inflate a > > query using wildcards via xxxxQuery sub classing, you could as easily > > (?) have some sort of Filter mechanism during the search, so that > > Lucene retrieves the Position vectors for all the terms that pass > > that filter, instead of retrieving only the position data for > > deterministic terms (with no wildcards etc.). If that was possible to > > do somehow, it could greatly increase the searchability of Lucene > > indices by using RegEx (without re-writing and getting the dreaded > > MaxClauseCount error) and similar. > > > > Would love to hear some insights on this one. > > > > Itamar. > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > >
