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https://issues.apache.org/jira/browse/LUCENE-9944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17356502#comment-17356502
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Michael McCandless commented on LUCENE-9944:
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Also, do we plan to backport this to 8.x?
> Implement alternative drill sideways faceting with provided CollectorManager
> ----------------------------------------------------------------------------
>
> Key: LUCENE-9944
> URL: https://issues.apache.org/jira/browse/LUCENE-9944
> 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
>
> Today, if a user of {{DrillSideways}} wants to provide their own
> {{CollectorManager}} when invoking {{search}}, they get this alternate,
> "concurrent" implementation that creates N copies of the provided
> {{DrillDownQuery}} (where N is the number of drill-down dimensions) and runs
> them all concurrently. This is a very different implementation than the one a
> user would get if providing a {{Collector}} instead. Additionally, an
> {{ExecutorService}} must be provided when constructing a {{DrillSideways}}
> instance if the user wants to bring their own {{CollectorManager}}
> (otherwise, they'll get an unfriendly NPE when calling {{search}}).
> I propose adding an implementation to {{DrillSideways}} that will run the
> "non-concurrent" algorithm in the case that a user wants to provide their own
> {{CollectorManager}} but doesn't want to provide an {{ExecutorService}} (and
> doesn't want the concurrent algorithm).
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