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From "Mikhail Khludnev (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-4571) speedup disjunction with minShouldMatch
Date Fri, 23 Nov 2012 15:00:59 GMT
Mikhail Khludnev created LUCENE-4571:
----------------------------------------

             Summary: speedup disjunction with minShouldMatch 
                 Key: LUCENE-4571
                 URL: https://issues.apache.org/jira/browse/LUCENE-4571
             Project: Lucene - Core
          Issue Type: Improvement
          Components: core/search
    Affects Versions: 4.1
            Reporter: Mikhail Khludnev


even minShouldMatch is supplied for DisjunctionSumScorer it enumerates whole disjunction,
and verifies minShouldMatch condition [on every doc|https://github.com/apache/lucene-solr/blob/trunk/lucene/core/src/java/org/apache/lucene/search/DisjunctionSumScorer.java#L70]:

{code}
  public int nextDoc() throws IOException {
    assert doc != NO_MORE_DOCS;
    while(true) {
      while (subScorers[0].docID() == doc) {
        if (subScorers[0].nextDoc() != NO_MORE_DOCS) {
          heapAdjust(0);
        } else {
          heapRemoveRoot();
          if (numScorers < minimumNrMatchers) {
            return doc = NO_MORE_DOCS;
          }
        }
      }
      afterNext();
      if (nrMatchers >= minimumNrMatchers) {
        break;
      }
    }
    
    return doc;
  }
{code}

[~spo] proposes (as well as I get it) to pop nrMatchers-1 scorers from the heap first, and
then push them back advancing behind that top doc. For me the question no.1 is there a performance
test for minShouldMatch constrained disjunction. 


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