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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