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https://issues.apache.org/jira/browse/LUCENE-4800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13587166#comment-13587166
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Robert Muir commented on LUCENE-4800:
-------------------------------------
the current patch will return 'true' for NaN
> FloatDocValues does not return true for 0 >< 1 values
> -----------------------------------------------------
>
> Key: LUCENE-4800
> URL: https://issues.apache.org/jira/browse/LUCENE-4800
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/search
> Affects Versions: 5.0
> Environment: 5.0-SNAPSHOT 1427825:1444730M - markus - 2013-02-11
> 11:39:54
> Reporter: Markus Jelsma
> Fix For: 5.0
>
> Attachments: LUCENE-4800-trunk.patch
>
>
> The following function query should always yield 1 if the document's field
> matchers the query:
> {code}if(query({!lucene df=FIELD v=$q},0),1,0){code}
> This is, however, not true if due to low IDF the score end up below 1 but,
> obviously, above 0. The if() statement does not recognize a number between
> zero and one as positive and therefore TRUE.
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