Uwe, thank you very much for such verbose answer!
I tried the code you mentioned ( searcher.createNormalizedWeight(query) ),
but it doesn't work on Lucene 3.5 for me either :(
My Solr server returns the document correctly on specified term
(field and value), field is indexed and stored.
I'm really stuck on it, because the API code seems to be simple and
has to behave as expected, index exists, solr returns correct results.
May be you have some thoughts on it, because my knowledge of "inner
Lucene" is not very good.
My code is:
File file = new File(luceneDir);
Preconditions.checkArgument(file.isDirectory(), "Lucene
directory: " + file.getAbsolutePath() + " does not exist or is not a
directory");
Directory directory = FSDirectory.open(file); //index exists,
IndexReader reader = SegmentReader.open(directory, true);
IndexSearcher searcher = new IndexSearcher(reader);
TermQuery termQuery = new TermQuery(new Term("lang", "en"));
Weight weight = searcher.createNormalizedWeight(termQuery);
Scorer scorer = weight.scorer(reader, true, false);
System.out.println("scorer = " + scorer); //outputs "scorer = null"
On 01/27/2012 08:46 PM, Uwe Schindler wrote:
One addition:
In general, your way how to get a scorer from a query is not supported (and
does not work correct for all queries), the right way is *not* to use
query.createWeight(searcher) but instead
searcher.createNormalizedWeight(query).
But that has nothing to do with the null scorer, which is a valid return
value if the term does not exist and no docs can ever match.
You are creating a TermScorer on a composite (non atomic IndexReader like
SegmentReader). That's still supported in 3.x, but no longer allowed in
4.0.
The backwards layer in 3.x had a bug before Lucene 3.5, so theoretically
your
code should work on 3.5:
https://issues.apache.org/jira/browse/LUCENE-3442
But still: null is a valid return value for scorer()!!! It may return
null, if no
document can match this query. Means the term does not exist at all.
Uwe
-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: u...@thetaphi.de
-----Original Message-----
From: Michael Kazekin [mailto:michael.kaze...@mediainsight.info]
Sent: Friday, January 27, 2012 4:39 PM
To: java-user@lucene.apache.org
Subject: Null scorer constructed by TermQuery
Hi!
I have a Solr-constructed index, which I read with this code:
Directory directory = FSDirectory.open(file); IndexReader reader =
IndexReader.open(directory, true); IndexSearcher searcher = new
IndexSearcher(reader);
I try to get a Scorer with this TermQuery ("lang" field is indexed and
stored and
all data is available)
TermQuery atomQuery = new TermQuery(new Term("lang", "ru"));
Weight weight = atomQuery.createWeight(searcher); Scorer scorer =
weight.scorer(reader, true, false);
after this scorer is null.
Does anyone know, what could be the problem here?
I tried it with Solr. 3.4 and with Solr 3.5, results are the same.
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