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https://issues.apache.org/jira/browse/LUCENE-8956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16923568#comment-16923568
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Paul Sanwald commented on LUCENE-8956:
--------------------------------------
Sorry for the noise here: The bug here was that the test that exercises rescore
twice was re-using the hits object, which contains an array of ScoreDocs that
are mutated by rescore. I've uploaded a new patch that I believe addresses the
bug.
> 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
> Fix For: 8.3
>
> 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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