fastest way to get raw hit count

hi all,
   
  is there a faster way to retrieve ONLY the count of
results for a query?
   
  lucene ranks (scores) the first batch of docs and sorts
them by rank, this is functionality i dont need in certain
queries and i assume, not doing this can return the count
faster then the hits.length()
   
  any ideas???
   
  thanks,,,

		
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On Monday 29 May 2006 15:54, zzzzz shalev wrote:
> hi all,
>    
>   is there a faster way to retrieve ONLY the count of
results for a query?
>    
>   lucene ranks (scores) the first batch of docs and
sorts them by rank, this 
is functionality i dont need in certain queries and i
assume, not doing this 
can return the count faster then the hits.length()

Untested:

Scorer scorer =
 query.weight(indexSearcher).scorer(indexSearcher.getIndexRe
ader());

int docCount = 0;
while (scorer.next()) docCount++;


Regards,
Paul Elschot

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: Scorer scorer =
: 
query.weight(indexSearcher).scorer(indexSearcher.getIndexRea
der());

You'd need to rewrite the query first to be safe.

A slightly higher level API approach would be a HitCollector
that just
counts the hits...

http://lucene.apache.org/java/d
ocs/api/org/apache/lucene/search/HitCollector.html

   Searcher searcher = new IndexSearcher(indexReader);
   final int[] count = new int[0]; // use array container
since need final
   searcher.search(query, new HitCollector() {
      public void collect(int doc, float score) {
         count[0]++;
      }
    });
    System.out.println("count of matches: " +
count[0]):



-Hoss


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