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https://issues.apache.org/jira/browse/LUCENE-10067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17403974#comment-17403974
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Robert Muir commented on LUCENE-10067:
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here is the commits/diff between the two benchmark runs: 
https://github.com/apache/lucene/compare/636d10be64ba78230e9ba2b398b7a9d0cf098e44...db26215f156d956143e29f1ce43f90c30cd8a107

(I opened a luceneutil bug to fix this to point at apache/lucene instead of 
apache/lucene-solr, that is why point-n-click doesnt work)

> investigate 6/23/2001 -> 6/24/2001 drop in facets perf
> ------------------------------------------------------
>
>                 Key: LUCENE-10067
>                 URL: https://issues.apache.org/jira/browse/LUCENE-10067
>             Project: Lucene - Core
>          Issue Type: Task
>            Reporter: Robert Muir
>            Priority: Major
>
> Just looking at perf graph (and recent gains from LUCENE-5309), it is unclear 
> why performance dropped on that date, and if we paved new, better 
> performance, or instead just regained some lost-ground only in the single 
> value case?
> Example:
> https://home.apache.org/~mikemccand/lucenebench/BrowseDayOfYearSSDVFacets.html
> after some debugging, it looks like LUCENE-9613 change may be responsible. It 
> was the only relevant change between the 6/23 and 6/24 benchmarks. 



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