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https://issues.apache.org/jira/browse/LUCENE-4859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13607666#comment-13607666
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Robert Muir commented on LUCENE-4859:
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+1 to this idea. none of these stats cost anything to expose this way... its
just summing.
> Expose more stats on IndexReader
> --------------------------------
>
> Key: LUCENE-4859
> URL: https://issues.apache.org/jira/browse/LUCENE-4859
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> Reporter: Shai Erera
> Assignee: Shai Erera
>
> IndexReader exposes stats like totalTermFreq(term) and docFreq(term). I'd
> like to add more stats from Terms, e.g.
> getDocCount/getSumDocFreq/getSumTotalTermFreq(field) for convenience. The
> implementation is very easy to do on CompositeReader, so I'll add these impls
> to BaseCompositeReader. I'll attach a patch shortly.
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