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Posted to issues@lucene.apache.org by "Julie Tibshirani (Jira)" <ji...@apache.org> on 2021/03/04 23:55:00 UTC

[jira] [Created] (LUCENE-9823) SynonymQuery rewrite can change field boost calculation

Julie Tibshirani created LUCENE-9823:
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             Summary: SynonymQuery rewrite can change field boost calculation
                 Key: LUCENE-9823
                 URL: https://issues.apache.org/jira/browse/LUCENE-9823
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Julie Tibshirani


SynonymQuery accepts a boost per term, which acts as a multiplier on the term frequency in the document. When rewriting a SynonymQuery with a single term, we create a BoostQuery wrapping a TermQuery. This changes the meaning of the boost: it now multiplies the final TermQuery score instead of multiplying the term frequency before it's passed to the score calculation.

This is a small point, but maybe it's worth avoiding rewriting a single-term SynonymQuery unless the boost is 1.0.

The same consideration affects CombinedFieldQuery in sandbox.



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