Adrien Grand created LUCENE-7939:
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             Summary: Speed up MinShouldMatchSumScorer in conjunctions
                 Key: LUCENE-7939
                 URL: https://issues.apache.org/jira/browse/LUCENE-7939
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Adrien Grand
            Priority: Minor
             Fix For: master (8.0), 7.1


MinShouldMatchSumScorer has good iteration capabilities, but if it is not used 
as a lead for the iteration then the advance() call might make a lot of efforts 
in order to find the next match while we should instead let the lead iterator 
of the conjunction skip over non-matching documents. In this issue I'd like to 
explore changing MinShouldMatchSumScorer by giving it a two-phase iterator and 
making advance() return a candidate for the next match that is less good but 
much cheaper to compute.



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