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Posted to issues@lucene.apache.org by "ASF subversion and git services (Jira)" <ji...@apache.org> on 2022/03/16 12:20:00 UTC
[jira] [Commented] (LUCENE-10469) ConstantScoreQuery doesn't propagate its score mode correctly
[ https://issues.apache.org/jira/browse/LUCENE-10469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17507549#comment-17507549 ]
ASF subversion and git services commented on LUCENE-10469:
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Commit 86bd921fcedce6be69ff2aff70c99dcb78bd8ce5 in lucene's branch refs/heads/main from Adrien Grand
[ https://gitbox.apache.org/repos/asf?p=lucene.git;h=86bd921f ]
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
> 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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