[jira] [Created] (LUCENE-9944) Implement alternative drill sideways faceting with provided CollectorManager

["Greg Miller (Jira)" <ji...@apache.org>]

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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