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From Ian Lea <ian....@gmail.com>
Subject Re: During the wild card search, will lucene 2.9.0 to convert the search string to lower case?
Date Wed, 03 Feb 2010 10:06:04 GMT
I think you'll have to write your own.  Or just downcase the text
yourself first.


--
Ian.


On Tue, Feb 2, 2010 at 9:30 PM, java8964 java8964 <java8964@hotmail.com> wrote:
>
> Is there an analyzer like keyword analyzer, but will also lowering the data from lucene?
Or I have to do a customer analyzer by myself?
>
> Thanks
>
>> From: java8964@hotmail.com
>> To: java-user@lucene.apache.org
>> Subject: RE: During the wild card search, will lucene 2.9.0 to convert the search
string to lower case?
>> Date: Mon, 1 Feb 2010 14:24:00 -0500
>>
>>
>> This is maybe something I am looking for. We are using the default value, which is
true.
>>
>> Let me examine this method more.
>>
>> Thanks for your help.
>>
>> > From: digydigy@gmail.com
>> > To: java-user@lucene.apache.org
>> > Subject: RE: During the wild card search, will lucene 2.9.0 to convert the search
string to lower case?
>> > Date: Mon, 1 Feb 2010 20:36:29 +0200
>> >
>> > Did you try queryParser.SetLowercaseExpandedTerms(false)?
>> >
>> > DIGY
>> >
>> > -----Original Message-----
>> > From: java8964 java8964 [mailto:java8964@hotmail.com]
>> > Sent: Monday, February 01, 2010 8:11 PM
>> > To: java-user@lucene.apache.org
>> > Subject: RE: During the wild card search, will lucene 2.9.0 to convert the
>> > search string to lower case?
>> >
>> >
>> > I would like to confirm your reply. You mean that the query parse will lower
>> > casing. In fact, it looks like that it only does this for wild card query,
>> > right?
>> >
>> > For the term query, it didn't. As proved by if you change the line to:
>> >
>> >             Query query = new QueryParser("title",
>> > wrapper).parse("title:\"BBB CCC\"");
>> >
>> > You will get 1 hits back. So in this case, the query parser class did in
>> > different way for term query and wild card query.
>> >
>> > We have to use the query parse in this case, but we have our own Query
>> > parser class extends from the lucene query parser class. Anything we can do
>> > to about it?
>> >
>> > Will lucense's query parser class be fixed for the above inconsistent
>> > implementation?
>> >
>> > Thanks
>> >
>> >
>> > > From: uwe@thetaphi.de
>> > > To: java-user@lucene.apache.org
>> > > Subject: RE: During the wild card search, will lucene 2.9.0 to convert
the
>> > search string to lower case?
>> > > Date: Mon, 1 Feb 2010 17:41:08 +0100
>> > >
>> > > Only query parser does the lower casing. For such a special case, I would
>> > suggest to use a PrefixQuery or WildcardQuery directly and not use query
>> > parser.
>> > >
>> > > -----
>> > > Uwe Schindler
>> > > H.-H.-Meier-Allee 63, D-28213 Bremen
>> > > http://www.thetaphi.de
>> > > eMail: uwe@thetaphi.de
>> > >
>> > > > -----Original Message-----
>> > > > From: java8964 java8964 [mailto:java8964@hotmail.com]
>> > > > Sent: Monday, February 01, 2010 5:27 PM
>> > > > To: java-user@lucene.apache.org
>> > > > Subject: During the wild card search, will lucene 2.9.0 to convert
the
>> > > > search string to lower case?
>> > > >
>> > > >
>> > > > I noticed a strange result from the following test case. For wildcard
>> > > > search, my understanding is that lucene will NOT use any analyzer
on
>> > > > the query string. But as the following simple code to show, it looks
>> > > > like that lucene will lower case the search query in the wildcard
>> > > > search. Why? If not, why the following test case show the search hits
>> > > > as one for lower case wildcard search, but not for the upper case
data?
>> > > > My original data is NOT analyzed, so they should be stored as the
>> > > > original data in the index segment, right?
>> > > >
>> > > > Lucene version: 2.9.0
>> > > >
>> > > > JDK version: JDK 1.6.0_17
>> > > >
>> > > >
>> > > > public class IndexTest1 {
>> > > >     public static void main(String[] args) {
>> > > >         try {
>> > > >             Directory directory = new RAMDirectory();
>> > > >             IndexWriter writer = new IndexWriter(directory,
new
>> > > > StandardAnalyzer(Version.LUCENE_CURRENT),
>> > > > IndexWriter.MaxFieldLength.UNLIMITED);
>> > > >             Document doc = new Document();
>> > > >             doc.add(new Field("title", "BBB CCC", Field.Store.YES,
>> > > > Field.Index.NOT_ANALYZED));
>> > > >             writer.addDocument(doc);
>> > > >             doc = new Document();
>> > > >             doc.add(new Field("title", "ddd eee", Field.Store.YES,
>> > > > Field.Index.NOT_ANALYZED));
>> > > >             writer.addDocument(doc);
>> > > >
>> > > >             writer.close();
>> > > >
>> > > >             IndexSearcher searcher = new IndexSearcher(directory,
>> > > > true);
>> > > >             PerFieldAnalyzerWrapper wrapper = new
>> > > > PerFieldAnalyzerWrapper(new StandardAnalyzer(Version.LUCENE_CURRENT));
>> > > >             wrapper.addAnalyzer("title", new KeywordAnalyzer());
>> > > >             Query query = new QueryParser("title",
>> > > >                     wrapper).parse("title:BBB*");
>> > > >             System.out.println("hits of title = " +
>> > > > searcher.search(query, 100).totalHits);
>> > > >             query = new QueryParser("title",
>> > > >                     wrapper).parse("title:ddd*");
>> > > >             System.out.println("hits of title = " +
>> > > > searcher.search(query, 100).totalHits);
>> > > >             searcher.close();
>> > > >         } catch (Exception e) {
>> > > >             System.out.println(e);
>> > > >         }
>> > > >     }
>> > > > }
>> > > >
>> > > > The output:
>> > > > hits of title = 0
>> > > > hits of title = 1
>> > > >
>> > > >
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