[jira] [Created] (LUCENE-10469) ConstantScoreQuery doesn't propagate its score mode correctly

["Adrien Grand (Jira)" <ji...@apache.org>]

Adrien Grand created LUCENE-10469:
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             Summary: 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


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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