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From "Lance Norskog (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-517) norm compression breaks ranking for small fields
Date Sat, 21 Nov 2009 03:05:39 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12780901#action_12780901
] 

Lance Norskog commented on LUCENE-517:
--------------------------------------

[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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