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  1. Lucene - Core
  2. LUCENE-1360

A Similarity class which has unique length norms for numTerms <= 10

    Details

    • Type: Improvement
    • Status: Open
    • Priority: Trivial
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: core/query/scoring
    • Labels:
      None
    • Lucene Fields:
      New

      Description

      A Similarity class which extends DefaultSimilarity and simply overrides lengthNorm. lengthNorm is implemented as a lookup for numTerms <= 10, else as 1/sqrt(numTerms). This is to avoid term counts below 11 from having the same lengthNorm after stored as a single byte in the index.

      This is useful if your search is only on short fields such as titles or product descriptions.

      See mailing list discussion: http://www.nabble.com/How-to-boost-the-score-higher-in-case-user-query-matches-entire-field-value-than-just-some-words-within-a-field-td19079221.html

        Attachments

        1. LUCENE-1360.patch
          4 kB
          Robert Muir
        2. LUCENE-1380 visualization.pdf
          9 kB
          Lance Norskog
        3. ShortFieldNormSimilarity.java
          2 kB
          Sean Timm

          Activity

            People

            • Assignee:
              otis Otis Gospodnetic
              Reporter:
              timmsc Sean Timm
            • Votes:
              3 Vote for this issue
              Watchers:
              2 Start watching this issue

              Dates

              • Created:
                Updated: