[jira] [Created] (LUCENE-9962) DrillSideways users should be able to opt-out of "drill down" facet collecting

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

Greg Miller created LUCENE-9962:
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             Summary: 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


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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