> indexing your terms in reverse Unfortunately the suffix requires a wildcard as well in our case. There are a limited number of prefixes though (10ish), so perhaps we could combine them all into one query. We'd still need some sort of InverseWildcardQuery implementation.
> use another analyzer so you don't need wildcards I know analyzers can be used with IndexWriter and with QueryParser. Is there somewhere an analyzer could be used to alter the field to match the query at search time instead of altering the query to match the field? Our current path to solving our problem requires additional fields which need rewritten causing a much larger performance degredation. One of the two paths above would be much more desirable. ----- Original Message ---- From: Uwe Schindler <u...@thetaphi.de> To: java-user@lucene.apache.org Sent: Fri, July 30, 2010 10:41:13 AM Subject: RE: InverseWildcardQuery With all these requirements you slow down your queries immense. You should think about indexing your terms different: - if you need leading wildcards, think about indexing your terms in reverse! Wildcards starting with * needs to iterate all terms, so it's very slow (and because of this defaults to be disabled) - wildcards and regexes should always be used sparingly, as it can happen that the whole term dictionary needs to be checked. Maybe you should use another analyzer, so you don't need wildcards. Uwe ----- Uwe Schindler H.-H.-Meier-Allee 63, D-28213 Bremen http://www.thetaphi.de eMail: u...@thetaphi.de > -----Original Message----- > From: Ian Lea [mailto:ian....@gmail.com] > Sent: Friday, July 30, 2010 5:33 PM > To: java-user@lucene.apache.org > Subject: Re: InverseWildcardQuery > > > I think you're suggesting, for example, "*:* AND -myfield:foo*". > > Yes, I think that is equivalent. > > > If my document contains "myfield:foobar" and "myfield:dog", the > > document would be thrown out because of the first field. I want to > > keep the document because the second field does not match. > > OK, too hard for me ... > > > Related, is there a way to use wildcards to match the beginning of the > field? > > > > org.apache.lucene.queryParser.ParseException: Cannot parse '*:* AND > > -myfield:*foo*': '*' or '?' not allowed as first character in > > WildcardQuery > > Yes. QueryParser.setAllowLeadingWildcard(). > > > -- > Ian. > > --------------------------------------------------------------------- > 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 --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
