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https://issues.apache.org/jira/browse/LUCENE-4289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13429001#comment-13429001
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Uwe Schindler commented on LUCENE-4289:
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Too funny, +1 to fix. Backport?
> highlighter idf calculation problems
> ------------------------------------
>
> Key: LUCENE-4289
> URL: https://issues.apache.org/jira/browse/LUCENE-4289
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Attachments: LUCENE-4289.patch
>
>
> * highlighter uses numDocs instead of maxDoc
> * fastvectorhighlighter uses numDocs - numDeletedDocs instead of maxDoc (will
> go negative if more than half of docs are marked deleted)
> * fastvectorhighlighter calls docFreq and computes IDF per-position when it
> won't change (inefficient)
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