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https://issues.apache.org/jira/browse/LUCENE-9962?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17368865#comment-17368865
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ASF subversion and git services commented on LUCENE-9962:
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Commit 9942d59f0dc92db28d1dd79bf321cd2a05cdb6d1 in lucene's branch 
refs/heads/main from Greg Miller
[ https://gitbox.apache.org/repos/asf?p=lucene.git;h=9942d59 ]

Move CHANGES entries to 8.10 for LUCENE-9962/9946/9944/9988 (#194)



> DrillSideways users should be able to opt-out of "drill down" facet collecting
> ------------------------------------------------------------------------------
>
>                 Key: LUCENE-9962
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9962
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/facet
>    Affects Versions: main (9.0)
>            Reporter: Greg Miller
>            Priority: Minor
>             Fix For: main (9.0), 8.10
>
>          Time Spent: 1h 50m
>  Remaining Estimate: 0h
>
> The {{DrillSideways}} search methods will _always_ populate a 
> {{FacetsCollector}} for the "drill down" dimensions in addition to the "drill 
> sideways" dimensions. For most cases, this makes sense, but it would be nice 
> if users had a way to opt-out of this collection. It's possible a user may 
> not care to do any faceting on "drill down" dims, or may have custom needs 
> for facet collecting on the "drill downs." For the latter case, the user 
> might want to provide a {{Collector}}/{{CollectorManager}} that does facet 
> collecting with some custom logic (e.g., behind a 
> {{MultiCollector}}/{{MultiCollectorManager}}), in which case the population 
> of an additional {{FacetsCollector}} in {{DrillSideways}} is wasteful.
> The {{DrillSidewaysScorer}} already supports a {{null}} 
> {{drillDownCollector}} gracefully, so this change should mostly just involve 
> creating a {{protected}} method in {{DrillSideways}} for the purpose of 
> creating a "drill down" {{FacetsCollector}} that users can override by 
> providing {{null}}.



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