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https://issues.apache.org/jira/browse/LUCENE-10469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17507556#comment-17507556
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ASF subversion and git services commented on LUCENE-10469:
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Commit 31ddf6a6cd42aaf24d768a815700448c169d2efb in lucene's branch
refs/heads/branch_9x from Adrien Grand
[ https://gitbox.apache.org/repos/asf?p=lucene.git;h=31ddf6a ]
LUCENE-10469: Fix score mode propagation in ConstantScoreQuery. (#750)
> ConstantScoreQuery doesn't propagate its score mode correctly
> -------------------------------------------------------------
>
> Key: LUCENE-10469
> URL: https://issues.apache.org/jira/browse/LUCENE-10469
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Adrien Grand
> Priority: Minor
> Fix For: 9.1
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> We just noticed a performance bug on Elasticsearch that if you issue a search
> request sorted by field and the query is a MatchAllDocsQuery then everything
> works as expected.
> But if you change the query to be a MatchAllDocsQuery within a
> ConstantScoreQuery then the query suddenly visits all matching documents.
> This is due to the fact that ConstantScoreQuery always passes
> COMPLETE_NO_SCORES to the inner weight, and thet the MatchAllDocsQuery's
> optimized bulk scorer performs a brute-force for-loop over the documents to
> score unless the score mode is not exhaustive.
> The fix consists of making ConstantScoreQuery propagate a non-exhaustive
> score mode to the inner weight when the score mode that is passed to the
> ConstantScoreQuery is not exhaustive itself.
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