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https://issues.apache.org/jira/browse/LUCENE-7997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16218204#comment-16218204
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Adrien Grand commented on LUCENE-7997:
--------------------------------------

Thanks Robert!

> More sanity testing of similarities
> -----------------------------------
>
>                 Key: LUCENE-7997
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7997
>             Project: Lucene - Core
>          Issue Type: Task
>            Reporter: Adrien Grand
>            Priority: Minor
>             Fix For: master (8.0)
>
>         Attachments: LUCENE-7997.patch, LUCENE-7997_wip.patch, 
> LUCENE-7997_wip.patch, LUCENE-7997_wip.patch, LUCENE-7997_wip.patch, 
> LUCENE-7997_wip.patch, LUCENE-7997_wip.patch, LUCENE-7997_wip.patch, 
> LUCENE-7997_wip.patch, LUCENE-7997_wip.patch, LUCENE-7997_wip.patch, 
> LUCENE-7997_wip.patch, LUCENE-7997_wip.patch
>
>
> LUCENE-7993 is a potential optimization that we could only apply if the 
> similarity is an increasing functions of {{freq}} (all other things like DF 
> and length being equal). This sounds like a very reasonable requirement for a 
> similarity, so we should test it in the base similarity test case and maybe 
> move broken similarities to sandbox?



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