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https://issues.apache.org/jira/browse/LUCENE-9962?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17368846#comment-17368846
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ASF subversion and git services commented on LUCENE-9962:
---------------------------------------------------------
Commit 22c1c78bb395c77de19d6d9e9677b6efa872c11f in lucene-solr's branch
refs/heads/branch_8x from Greg Miller
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=22c1c78 ]
LUCENE-9962, LUCENE-9944, LUCENE-9988: DrillSideways improvement backports
(#2506)
* LUCENE-9962: Allow DrillSideways sub-classes to provide their own "drill
down" facet counting implementation (or null)
* LUCENE-9944: Allow DrillSideways users to pass a CollectorManager without
requiring an ExecutorService (and concurrent DrillSideways approach)
* LUCENE-9988: Fix DrillSideways bug discovered in randomized testing
> 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)
>
> Time Spent: 1h 40m
> 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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