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From "Randy Puttick (JIRA)" <>
Subject [jira] Created: (LUCENE-517) norm compression breaks ranking for small fields
Date Fri, 10 Mar 2006 18:19:41 GMT
norm compression breaks ranking for small fields

         Key: LUCENE-517
     Project: Lucene - Java
        Type: Bug
  Components: Index, Search  
    Versions: 1.9    
 Environment: N/A
    Reporter: Randy Puttick

The scheme of compressing document norms to one byte loses a lot of information.  This completely
breaks search ranking on small fields because there is no way to see the difference between
documents with shorter and longer fields that contain the same number of matching query terms.
 Unfortunately the export of norms as a byte array seems to be pretty well embedded in the
code base so a fix would seem to require a major rev.

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