FAQ
do you mean get tf of the hited documents when doing search?
it's a difficult problem because only TermScorer has TermDocs and using tf
in score() function.
but this we can't know whether these doc is selected because we use a
priorityQueue in TopScoreDocCollector

public void collect(int doc) throws IOException {
float score = scorer.score();

// This collector cannot handle these scores:
assert score != Float.NEGATIVE_INFINITY;
assert !Float.isNaN(score);

totalHits++;
if (score <= pqTop.score) {
// Since docs are returned in-order (i.e., increasing doc Id), a
document
// with equal score to pqTop.score cannot compete since HitQueue
favors
// documents with lower doc Ids. Therefore reject those docs too.
return;
}
pqTop.doc = doc + docBase;
pqTop.score = score;
pqTop = (ScoreDoc) pq.updateTop();
}
Because the scorer in BooleanScorer2 is
ConjuctionScorer(DisjuctionScorer). it can not get tf.
If you want to do this. you have to modify many codes
2010/12/25 Ranjit Kumar <Ranjit.Kumar@otssolutions.com>
Hi,

Merry Christmas!!



In case of Boolean query like *’sql AND server’ *.

I am using parser to get correct document containing both *sql* and *
server*. Inside for loop in below code I get correct documented and to get
frequency I need to sum frequency of ‘sql’ and ‘server’ individually with
the help of *termDocs.read(). *

As I am searching through millions of document. So, to calculate frequency
it takes about *160 Second* for *80k* document.



Is there any way to get frequency of ‘*Boolean query’ *directly without
manipulation. As it takes lots of time. In case of single term and phrase
query, I got frequency for 80k document within 10 Seconds.



*QueryParser parser = new QueryParser(Version.LUCENE_CURRENT, field,
analyzer);*

*parser.setDefaultOperator(QueryParser.AND_OPERATOR);*

*Query query = parser.parse(“sql AND server”);*

*TopDocs docs = searcher.search(query, null, n);*

*TermDocs termDocs = reader.termDocs();*

* termDocs.seek(new Term(field,
query.toString(field).split(" ")[0].toLowerCase()));*

* int[] ints = new int[docs.totalHits];*

* int[] ints1 = new int[docs.totalHits];*

* termDocs.read(ints, ints1);*

* List lsts = Arrays.asList(ArrayUtils.toObject(ints));
*

* List lsts1 =
Arrays.asList(ArrayUtils.toObject(ints1));*

* *

* termDocs.seek(new Term(field,
query.toString(field).split(" ")[1].toLowerCase()));*

* int[] inta = new int[docs.totalHits];*

* int[] inta1 = new int[docs.totalHits];*

* termDocs.read(inta, inta1);*

* List lsta = Arrays.asList(ArrayUtils.toObject(inta));
*

* List lsta1 =
Arrays.asList(ArrayUtils.toObject(inta1));*

* *

* int totalFreq = 0;*

* int docId = -1;*

* String a = null;*

* int contId = 0;*

* String path=null;*

*for (int i = 0; i < docs2.scoreDocs.length; i++) { *

* docId = docs2.scoreDocs[i].doc;*

* path=reader.document(docId).get("path");*

* a = path.substring(path.lastIndexOf("\\") + 1,
path.lastIndexOf("."));*

* try {*

* if(a.indexOf("e")>-1){*

* contId =
Integer.parseInt(a.substring(0, a.length()-1));*

* }else{*

* contId = Integer.parseInt(a);*

* }*

* } catch (Exception e) {*

*// e.printStackTrace();*

* }*

* *

* if ((lsts.indexOf(docId) > -1 &&
lsta.indexOf(docId) > -1) || (lsta.indexOf(docId) > -1) &&
lsts.indexOf(docId) > -1) {*

* totalFreq = (Integer)
lsts1.get(lsts.indexOf(docId)) + (Integer) lsta1.get(lsta.indexOf(docId));
*

* } else if (lsts.indexOf(docId) > -1) {*

* totalFreq = (Integer)
lsts1.get(lsts.indexOf(docId));*

* } else if (lsta.indexOf(docId) > -1) {*

* totalFreq = (Integer)
lsta1.get(lsta.indexOf(docId));*

* }*

* *

*
w.write(contId+"\t"+ID+"\t"+totalFreq+"\t"+reader.document(docId).get("path")+"\n");
*

* }*





Thanks & Regards,

*Ranjit Kumar ***

Associate Software Engineer



[image: cid:image002.jpg@01CB7089.C0069B40]



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