[jira] [Created] (OAK-5143) Augmented query terms due to FulltextQueryTermsProvider tend to get more weight while scoring results

["Vikas Saurabh (JIRA)" <ji...@apache.org>]

Vikas Saurabh created OAK-5143:
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             Summary: Augmented query terms due to FulltextQueryTermsProvider tend to get more weight while scoring results
                 Key: OAK-5143
                 URL: https://issues.apache.org/jira/browse/OAK-5143
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: lucene
    Affects Versions: 1.4
            Reporter: Vikas Saurabh
            Assignee: Vikas Saurabh
            Priority: Minor
             Fix For: 1.8


Current implementation of using FulltextQueryTermsProvider service(s) collects query terms from these objects and attaches it to full text query as a big or clause. So, if original query was {{a='b' OR c='d'}} and we had a query term provider which would add {{e='f'}} then the final query would look like {{(a='b' OR c='d') OR e='f'}}. This query is correct semantically but while scoring from lucene's perspective the clause {{e='f'}} can singly allow the condition to be true and hence it gets more weight (actually, the truth is that the first part get less weight if only one condition from first part is met - ie if indeed a='b' but c!='d' then the score for first part of the query get a multiplier of 0.5 aka coord-factor \[0]).

\[0]: https://lucene.apache.org/core/4_7_0/core/org/apache/lucene/search/similarities/TFIDFSimilarity.html



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