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https://issues.apache.org/jira/browse/LUCENE-8103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17053517#comment-17053517
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David Smiley commented on LUCENE-8103:
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Notice that {{TwoPhaseIterator.asDocIdSetIterator(tpi);}} will return an
implementation whose {{advance(docId)}} method will move beyond the passed in
docID and call matches until it finds a match. That is a waste _if the user of
this DISI doesn't care what the next matching document is if the approximation
doesn't match_. So QueryValueSource's exists() method could work with the
approximation first and if that matches, then and only then call TPI.match. If
there is no TPI then the the scorer's DISI is accurate.
> 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
> Attachments: LUCENE-8103.patch
>
>
> 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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