Adrien Grand created LUCENE-7716:
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             Summary: Reduce specialization in TopFieldCollector
                 Key: LUCENE-7716
                 URL: https://issues.apache.org/jira/browse/LUCENE-7716
             Project: Lucene - Core
          Issue Type: Wish
            Reporter: Adrien Grand
            Priority: Minor


TopFieldCollector optimizes the single-comparator case. I think we could 
replace this specialization with a MultiLeafFieldComparator wrapper, similarly 
to how MultiCollector works. This would have the benefit of replacing code 
duplication of non-trivial logic with a simple wrapper that delegates calls to 
its sub comparators.



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