Hi
The problem I would like to solve is determining the lucene score of a word in
_a particular_ given document. The 2 candidates i have been trying are
- QueryWrapperFilter
- BooleanQuery
Both are to restrict search within a search space. But according to Doug
Cutting QueryWrapperFilter option is less preferable than Boolean Query.
However, I am experiencing both performance (very slow) and response problems
(query is not matched to any doc).
The setup is as follows. Given a user query "word":
QueryParser parser = new QueryParser(Version.LUCENE_32, "content",new
StandardAnalyzer(Version.LUCENE_32));
Query query = parser.parse(word);
Document d = WikiIndexSearcher.doc(match.doc);
docTitle = d.get("title");
TermQuery titleQuery = new TermQuery(new Term("title", docTitle));
BooleanQuery bQuery = new BooleanQuery();
bQuery.add(titleQuery, BooleanClause.Occur.MUST);
bQuery.add(query, BooleanClause.Occur.MUST);
TopDocs hits = WikiIndexSearcher.search(bQuery, 1);
In other words, find a wikipedia doc with a particular title (in example below
it is "list of newspapers in New York
http://en.wikipedia.org/wiki/List_of_newspapers_in_New_York";). We then create a
boolean term query with that must match on the title and content must match the
user query ('american' in the example below).
Here is the output of a run on user query "american" in a doc with title "list
of newspapers in New York").
... QUERY: content:american
... doc: List of newspapers in New York
... query: +title:List of newspapers in New York +content:american
... explanation 568744: 0.0 = (NON-MATCH) Failure to meet condition(s) of
required/prohibited clause(s)
0.0 = no match on required clause (title:List of newspapers in New York)
0.011818626 = (MATCH) weight(content:american in 212081), product of:
0.15625292 = queryWeight(content:american), product of:
2.4204094 = idf(docFreq=392249, maxDocs=1623450)
0.0645564 = queryNorm
0.075637795 = (MATCH) fieldWeight(content:american in 212081), product of:
1.0 = tf(termFreq(content:american)=1)
2.4204094 = idf(docFreq=392249, maxDocs=1623450)
0.03125 = fieldNorm(field=content, doc=212081)
As you can see there is no match to the query (and hits.totalcounts is 0). The
search is very slow too.
Any help would be much appreciated
