-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 It works now - I simply applied MultiTermQuery.CONSTANT_SCORE_BOOLEAN_QUERY_REWRITE to all (sub)MultiTermQueries in the query given from QueryParser. Then, Query.extractTerms works again.
Someone only have to be clear that this gives BooleanQuery.getMaxClauseCount() terms at maximum. Performance could be improved by subclassing an own RewriteMethod. Thanks a lot Chris On 06.10.2014 19:35, Uwe Schindler wrote: > Hi, > > Lucene no longer rewrites Wildcards and other MultiTermQueries to Boolean > Queries by default, > because execution of such queries is too slow. If you just want to get the > filtered index > terms, it is easiest to write your own MultiTermQuery.RewriteMethod that > collects all terms > while rewriting and set it on the MultiTermQuery variant and rewrite it to > collect the terms. > > Uwe > > ----- Uwe Schindler H.-H.-Meier-Allee 63, D-28213 Bremen > http://www.thetaphi.de eMail: > u...@thetaphi.de > >> -----Original Message----- From: Christian Reuschling >> [mailto:reuschl...@dfki.uni-kl.de] >> Sent: Monday, October 06, 2014 6:06 PM To: java-user@lucene.apache.org >> Subject: >> query.extractTerms(..) on rewritten queries >> > Hi, > > currently I migrate to Lucene 4. In the past, I did a trick to get the index > specific terms for > an according (wildcard) query (see below). But it don't works anymore: > > String queryString = "n*"; // gives no result // String queryString = "nöä"; > // results, but > only the given String - not the real index terms > > Query query = new QueryParser(Version.LUCENE_CURRENT, "body", new > StandardAnalyzer(Version.LUCENE_CURRENT)).parse(queryString); > > Query rewritten = searcher.rewrite(query); > > HashSet<Term> hsTerms = new HashSet<>(); > > rewritten.extractTerms(hsTerms); > > in the past, searcher.rewrite on a wildcard query results into a new > BooleanQuery with simple > TermQueries in it, representing the matching primitive terms from the index. > > The javaDoc of the current release sounds to me that this could still work: > > Searcher.rewrite: /**Expert: called to re-write queries into primitive > queries.**/ > > Query.extractTerms: /**Expert: adds all terms occurring in this query to the > terms set. Only > works if this query is in its {@link #rewrite rewritten} form.**/ > > > > Thanks in advance! > > Christian > >> >> --------------------------------------------------------------------- To >> unsubscribe, e-mail: >> java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: >> java-user-h...@lucene.apache.org > > > --------------------------------------------------------------------- To > unsubscribe, e-mail: > java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: > java-user-h...@lucene.apache.org > - -- ______________________________________________________________________________ Christian Reuschling, Dipl.-Ing.(BA) Software Engineer Knowledge Management Department German Research Center for Artificial Intelligence DFKI GmbH Trippstadter Straße 122, D-67663 Kaiserslautern, Germany Phone: +49.631.20575-1250 mailto:reuschl...@dfki.de http://www.dfki.uni-kl.de/~reuschling/ - ------------Legal Company Information Required by German Law------------------ Geschäftsführung: Prof. Dr. Dr. h.c. mult. Wolfgang Wahlster (Vorsitzender) Dr. Walter Olthoff Vorsitzender des Aufsichtsrats: Prof. Dr. h.c. Hans A. Aukes Amtsgericht Kaiserslautern, HRB 2313= ______________________________________________________________________________ -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (GNU/Linux) iEYEARECAAYFAlQzvfcACgkQ6EqMXq+WZg9CCQCgge0f0v0yl7HKFr80d7yCHwgz kY0AniYUa/27VS4gIYZ/YzCCp7EHFXha =HMvr -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
