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https://issues.apache.org/jira/browse/LUCENE-698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12499673
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Michael Busch commented on LUCENE-698:
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> but we should probably also fix FilteredQuery so that a boost of 0
> produces some other result then just a NaN score (either an exception,
> or a score of 0) since as you say: NaN scores are bad.
TermQuery actually behaves the same way. If boost is zero, then
sumOfSquaredWeights() returns zero as well, resulting in a
queryNorm of Infinity (due to a div by zero if DefaultSimilarity is
used). Then it multiplies boost and queryNorm and 0*Infinity=NaN.
> FilteredQuery ignores boost
> ---------------------------
>
> Key: LUCENE-698
> URL: https://issues.apache.org/jira/browse/LUCENE-698
> Project: Lucene - Java
> Issue Type: Bug
> Components: Search
> Affects Versions: 2.0.0
> Reporter: Yonik Seeley
> Assignee: Michael Busch
> Priority: Minor
> Attachments: lucene-698.patch
>
>
> Filtered query ignores it's own boost.
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