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https://issues.apache.org/jira/browse/LUCENE-1586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12695788#action_12695788
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Uwe Schindler commented on LUCENE-1586:
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Sorry,
that cannot work, because the segments can share the same terms, so the sum is
always > the real unique term count.
> add IndexReader.getUniqueTermCount
> ----------------------------------
>
> Key: LUCENE-1586
> URL: https://issues.apache.org/jira/browse/LUCENE-1586
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 2.9
>
> Attachments: LUCENE-1586.patch
>
>
> Simple API to return number of unique terms (across all fields). Spinoff
> from here:
> http://www.lucidimagination.com/search/document/536b22e017be3e27/term_limit
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