Adrien Grand created LUCENE-6261:
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             Summary: TwoPhaseDocIdSetIterator.matches should be called at most 
once per doc ID
                 Key: LUCENE-6261
                 URL: https://issues.apache.org/jira/browse/LUCENE-6261
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Adrien Grand
            Assignee: Adrien Grand
            Priority: Minor


We did not document it but TwoPhaseDocIdSetIterator.matches should only be 
called once per doc ID. In some cases, running it twice might not work (eg. 
phrases since the positions would already be consumed when we try to call 
matches() on the second time) and in the general case it would be a performance 
bug if this method is called several times anyway.



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