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  1. Lucene - Core
  2. LUCENE-1302

explain should not mask negative scores

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Minor
    • Resolution: Invalid
    • Affects Version/s: None
    • Fix Version/s: 2.4
    • Component/s: core/query/scoring
    • Labels:
      None
    • Lucene Fields:
      Patch Available

      Description

      Explanation.isMatch() returns false for 0 or negative scores.
      Hence negative scores are omitted from the explanation.
      This causes, when using e.g. BoostingTermQuery with negative boosts, a difference between the collected doc score and the score shown by explain().

      A word on the usage of this - BTQ with negative boosts is useful for "punishing" documents for containing a term. It also allows all sorts of tricks with multiplying query boost by the BTQ boost, so you get a positive score if both boosts have the same sign but negative otherwise. - I am sure there other uses as well.

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            • Assignee:
              doronc Doron Cohen
              Reporter:
              doronc Doron Cohen
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              • Created:
                Updated:
                Resolved: