• Type: Bug Bug
    • Status: Resolved
    • Priority: Minor Minor
    • Resolution: Fixed
    • Affects Version/s: 1.2
    • Fix Version/s: Trunk, 5.x
    • Component/s: core/search
    • Labels:
    • Environment:

      Operating System: All
      Platform: All


      Queries which automatically produce multiple terms (wildcard, range, prefix,
      fuzzy etc)currently suffer from two problems:

      1) Scores for matching documents are significantly smaller than term queries
      because of the volume of terms introduced (A match on query Foo~ is 0.1
      whereas a match on query Foo is 1).
      2) The rarer forms of expanded terms are favoured over those of more common
      forms because of the IDF. When using Fuzzy queries for example, rare mis-
      spellings typically appear in results before the more common correct spellings.

      I will attach a patch that corrects the issues identified above by
      1) Overriding Similarity.coord to counteract the downplaying of scores
      introduced by expanding terms.
      2) Taking the IDF factor of the most common form of expanded terms as the
      basis of scoring all other expanded terms.

      1. LUCENE-329.patch
        11 kB
        Mark Harwood
      2. LUCENE-329.patch
        12 kB
        Mark Harwood
      3. LUCENE-329.patch
        13 kB
        Mark Harwood
      4. LUCENE-329.patch
        13 kB
        Mark Harwood
      5. ASF.LICENSE.NOT.GRANTED--patch.txt
        11 kB
        Mark Harwood

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            • Assignee:
              Mark Harwood
              Mark Harwood
            • Votes:
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              8 Start watching this issue


              • Created: