[jira] [Commented] (LUCENE-8031) DOCS_ONLY fields set incorrect length norms

["Adrien Grand (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-8031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16325975#comment-16325975 ] 

Adrien Grand commented on LUCENE-8031:
--------------------------------------

+1 to disallow downgrading

> DOCS_ONLY fields set incorrect length norms
> -------------------------------------------
>
>                 Key: LUCENE-8031
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8031
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>            Priority: Major
>         Attachments: LUCENE-8031.patch
>
>
> Term frequencies are discarded in the DOCS_ONLY case from the postings list but they still count against the length normalization, which looks like it may screw stuff up.
> I ran some quick experiments on LUCENE-8025, by encoding fieldInvertState.getUniqueTermCount() and it seemed worth fixing (e.g. 20% or 30% improvement potentially). Happy to do testing for real, if we want to fix.
> But this seems tricky, today you can downgrade to DOCS_ONLY on the fly, and its hard for me to think about that case (i think its generally screwed up besides this, but still).



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