Greg Miller created LUCENE-9944:
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Summary: 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
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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