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https://issues.apache.org/jira/browse/LUCENE-9962?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17355308#comment-17355308
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ASF subversion and git services commented on LUCENE-9962:
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Commit 3c7a76a148b28cd2b2dc3a60f32e0b2816b75e21 in lucene's branch
refs/heads/main from Greg Miller
[ https://gitbox.apache.org/repos/asf?p=lucene.git;h=3c7a76a ]
LUCENE-9962: Allow DrillSideways sub-classes to provide their own "drill down"
facet counting implementation (or null). (#143)
> 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
> Time Spent: 1h
> 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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