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https://issues.apache.org/jira/browse/LUCENE-4571?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mikhail Khludnev updated LUCENE-4571:
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Comment: was deleted
(was: Robert,
I've got your points. I need some time to familiarize with luceneutil. btw, why
it's not in the main Lucene codebase (I assume it's a frequent question)?
About BS1 (despite it's an offtop formally), I'm not really understand how you
want to score via
[term-at-time|http://nlp.stanford.edu/IR-book/html/htmledition/computing-vector-scores-1.html#fig:cosinealg]
for minShouldMatch, will you allocate more than single bit (or even byte) per
document in a buffer? )
> 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 to 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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