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https://issues.apache.org/jira/browse/LUCENE-8007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16226945#comment-16226945
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Adrien Grand commented on LUCENE-8007:
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bq. the codec (e.g. BlockTree) could just return docFreq and sumDocFreq instead
Good point. Given that PostingsEnum#freq returns 1 with DOCS_ONLY, that would
be consistent.
bq. Also the patch corrects calculations for SImilarityBase but not BM25. We
should either fix BM25 here too (essentially fold in LUCENE-8025) or just
revert the change to SimilarityBase to avoid confusion?
I did these changes since you suggested them in your previous comment. I will
revert.
> 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, LUCENE-8007.patch, 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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