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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-901) DefaultSimilarity.queryNorm() should never return Infinity
Date Fri, 01 Jun 2007 17:53:15 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12500782
] 

Hoss Man commented on LUCENE-901:
---------------------------------

> From a scoring perspective, it's a multiplier that's only used at the top level, so the
scores produced will be zero anyway. 

huh?  queryNorm is passed down by BooleanWeight to all of the sub clauses ... am i miss understanding
something? 

> DefaultSimilarity.queryNorm() should never return Infinity
> ----------------------------------------------------------
>
>                 Key: LUCENE-901
>                 URL: https://issues.apache.org/jira/browse/LUCENE-901
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Search
>            Reporter: Michael Busch
>            Priority: Trivial
>
> Currently DefaultSimilarity.queryNorm() returns Infinity if sumOfSquaredWeights=0.
> This can result in a score of NaN (e. g. in TermScorer) if boost=0.0f.
> A simple fix would be to return 1.0f in case zero is passed in.
> See LUCENE-698 for discussions about this.

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