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https://issues.apache.org/jira/browse/LUCENE-8007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16218687#comment-16218687
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Robert Muir commented on LUCENE-8007:
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Do we need the terms.size? I am concerned about a trappy method there: do we
need it?
I don't see this as an index statistic (e.g. no similarity uses it) but instead
a heuristic for sizing datastructures and the like.
> Require that codecs always store totalTermFreq, sumDocFreq and
> sumTotalTermFreq
> -------------------------------------------------------------------------------
>
> Key: LUCENE-8007
> URL: https://issues.apache.org/jira/browse/LUCENE-8007
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Fix For: master (8.0)
>
> Attachments: LUCENE-8007.patch
>
>
> Javadocs allow codecs to not store some index statistics. Given discussion
> that occurred on LUCENE-4100, this was mostly implemented this way to support
> pre-flex codecs. We should now require that all codecs store these statistics.
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