mkhludnev commented on code in PR #814:
URL: https://github.com/apache/solr/pull/814#discussion_r867240926


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solr/core/src/java/org/apache/solr/query/FilterQuery.java:
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@@ -125,11 +126,24 @@ public Weight createWeight(IndexSearcher searcher, 
ScoreMode scoreMode, float bo
       return new ConstantScoreQuery(q).createWeight(searcher, scoreMode, 0f);
     }
 
-    SolrIndexSearcher solrSearcher = (SolrIndexSearcher) searcher;
-    DocSet docs = solrSearcher.getDocSet(q);
+    DocSet docs = createDocSet((SolrIndexSearcher) searcher);
     // reqInfo.addCloseHook(docs);  // needed for off-heap refcounting
 
     // note: DocSet.makeQuery is basically a CSQ
     return docs.makeQuery().createWeight(searcher, scoreMode, 0f);
   }
+
+  @Override
+  public DocSet createDocSet(SolrIndexSearcher searcher) throws IOException {
+    /*
+    There is a substantial practical reason for FilterQuery to implement 
DocSetProducer:

Review Comment:
   Well, you know, it might not be a good idea to open this can of worms. 
   There's `org.apache.solr.search.SolrIndexSearcher#getDocSetNC`, where NC 
implies NOcache, I suppose. That method hits  
org.apache.solr.search.DocSetUtil#createDocSet(), which checks for 
`DocSetProducer`. I'm not sure if reaching filtercache here is what 
`getDocSetNC` is plan to do. 



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