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https://issues.apache.org/jira/browse/LUCENE-8956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16920853#comment-16920853
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Adrien Grand commented on LUCENE-8956:
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I was thinking that we could verify that we have the right hits by rescoring
twice, once with topN=random().nextInt(numDocs) like in your patch, and another
time with topN=numDocs, then make sure that the first topN hits are the same in
both cases (CheckHits#checkEquals might help).
> QueryRescorer sort optimization
> -------------------------------
>
> Key: LUCENE-8956
> URL: https://issues.apache.org/jira/browse/LUCENE-8956
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/query/scoring
> Reporter: Paul Sanwald
> Priority: Minor
> Attachments: LUCENE-8956.patch
>
>
> This patch addresses a TODO in QueryRescorer: We should not sort the full
> array of the results returned from rescoring, but rather only topN, when topN
> is less than total hits.
>
> Made this optimization with some suggestions from [~jpountz] and [~jimczi],
> this is my first lucene patch submission.
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