[jira] [Commented] (LUCENE-8025) compute avgdl correctly for DOCS_ONLY

["ASF subversion and git services (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-8025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16234956#comment-16234956 ] 

ASF subversion and git services commented on LUCENE-8025:
---------------------------------------------------------

Commit 7495a9d75bb2efde2f76d68b376560ab86693cd9 in lucene-solr's branch refs/heads/master from [~rcmuir]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=7495a9d ]

LUCENE-8025: Use totalTermFreq=sumDocFreq when scoring DOCS_ONLY fields


> compute avgdl correctly for DOCS_ONLY
> -------------------------------------
>
>                 Key: LUCENE-8025
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8025
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>            Priority: Major
>         Attachments: LUCENE-8025.patch
>
>
> Spinoff of LUCENE-8007:
> If you omit term frequencies, we should score as if all tf values were 1. This is the way it worked for e.g. ClassicSimilarity and you can understand how it degrades. 
> However for sims such as BM25, we bail out on computing avg doclength (and just return a bogus value of 1) today, screwing up stuff related to length normalization too, which is separate.
> Instead of a bogus value, we should substitute sumDocFreq for sumTotalTermFreq (all postings have freq of 1, since you omitted them).



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