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https://issues.apache.org/jira/browse/LUCENE-517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12780901#action_12780901
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Lance Norskog commented on LUCENE-517:
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[LUCENE-1360|http://issues.apache.org/jira/browse/LUCENE-1360] is a more
complete version of this problem. Please close this in favor of 1360.
> norm compression breaks ranking for small fields
> ------------------------------------------------
>
> Key: LUCENE-517
> URL: https://issues.apache.org/jira/browse/LUCENE-517
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index, Search
> Affects Versions: 1.9
> Environment: N/A
> Reporter: Randy Puttick
> Priority: Minor
>
> 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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