[jira] [Created] (LUCENE-9402) Let MultiCollector Scorer handle minCompetitiveScore calls

["Tomas Eduardo Fernandez Lobbe (Jira)" <ji...@apache.org>]

Tomas Eduardo Fernandez Lobbe created LUCENE-9402:
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             Summary: Let MultiCollector Scorer handle minCompetitiveScore calls
                 Key: LUCENE-9402
                 URL: https://issues.apache.org/jira/browse/LUCENE-9402
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Tomas Eduardo Fernandez Lobbe


See SOLR-14554. MultiCollector creates a scorer that explicitly prevents setting the {{minCompetitiveScore}}:

{code:java}
@Override
    public void setScorer(Scorable scorer) throws IOException {
      if (cacheScores) {
        scorer = new ScoreCachingWrappingScorer(scorer);
      }
      scorer = new FilterScorable(scorer) {
        @Override
        public void setMinCompetitiveScore(float minScore) throws IOException {
          // Ignore calls to setMinCompetitiveScore so that if we wrap two
          // collectors and one of them wants to skip low-scoring hits, then
          // the other collector still sees all hits. We could try to reconcile
          // min scores and take the maximum min score across collectors, but
          // this is very unlikely to be helpful in practice.
        }

      };
      for (int i = 0; i < numCollectors; ++i) {
        final LeafCollector c = collectors[i];
        c.setScorer(scorer);
      }
    }
{code}
Solr uses MultiCollector when scores are requested (to collect the max score), which means it wouldn't be able to use WAND algorithm.



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