David Smiley created LUCENE-8103:
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             Summary: QueryValueSource should use TwoPhaseIterator
                 Key: LUCENE-8103
                 URL: https://issues.apache.org/jira/browse/LUCENE-8103
             Project: Lucene - Core
          Issue Type: Improvement
          Components: modules/other
            Reporter: David Smiley
            Priority: Minor


QueryValueSource (in "queries" module) is a ValueSource representation of a 
Query; the score is the value.  It ought to try to use a TwoPhaseIterator from 
the query if it can be offered. This will prevent possibly expensive advancing 
beyond documents that we aren't interested in.



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