QueryParser has a special capability to lowercase wildcard and prefix
queries, simply because they are not passed to an analyzer. Term
queries, phrase queries (like your example), etc are passed on to the
analyzer. You are using the KeywordAnalyzer for the title field, and
thus it is not lowercased. Choose a different analyzer that
lowercases and it will.
Erik
On Feb 1, 2010, at 1:10 PM, java8964 java8964 wrote:
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: u...@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: u...@thetaphi.de
-----Original Message-----
From: java8964 java8964 [mailto:java8...@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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