gsmiller commented on a change in pull request #240:
URL: https://github.com/apache/lucene/pull/240#discussion_r693359352



##########
File path: lucene/facet/src/java/org/apache/lucene/facet/DrillSideways.java
##########
@@ -520,10 +458,39 @@ private DrillDownQuery getDrillDownQuery(
   }
 
   @SuppressWarnings("unchecked")
-  private <R> ConcurrentDrillSidewaysResult<R> searchSequentially(
-      final DrillDownQuery query, final CollectorManager<?, R> 
hitCollectorManager)
+  private <C extends Collector, R> ConcurrentDrillSidewaysResult<R> 
searchSequentially(
+      final DrillDownQuery query, final CollectorManager<C, R> 
hitCollectorManager)
       throws IOException {
 
+    // This mirrors a similar hack from DrillSideways#search(query, collector).
+    // Without this cache, LRU cache will be used, causing acceptDocs to be 
null during collection

Review comment:
       Also, @zacharymorn, since this appears to be a pre-existing bug that's 
separate from the change you're working on here, I went ahead and cut an issue 
for it: [LUCENE-10060](https://issues.apache.org/jira/browse/LUCENE-10060). 
Let's take our conversation over there so your PR doesn't get too overwhelmed 
by it :).




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