epotyom commented on code in PR #13568:
URL: https://github.com/apache/lucene/pull/13568#discussion_r1678175501


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lucene/sandbox/src/test/org/apache/lucene/sandbox/facet/SandboxFacetTestCase.java:
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@@ -0,0 +1,407 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.lucene.sandbox.facet;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import org.apache.lucene.facet.FacetResult;
+import org.apache.lucene.facet.FacetsCollector;
+import org.apache.lucene.facet.FacetsCollector.MatchingDocs;
+import org.apache.lucene.facet.FacetsConfig;
+import org.apache.lucene.facet.LabelAndValue;
+import org.apache.lucene.facet.taxonomy.FacetLabel;
+import org.apache.lucene.facet.taxonomy.TaxonomyFacetLabels;
+import org.apache.lucene.facet.taxonomy.TaxonomyFacetLabels.FacetLabelReader;
+import org.apache.lucene.facet.taxonomy.TaxonomyReader;
+import org.apache.lucene.sandbox.facet.abstracts.OrdLabelBiMap;
+import org.apache.lucene.sandbox.facet.abstracts.OrdToComparable;
+import org.apache.lucene.sandbox.facet.abstracts.OrdinalIterator;
+import org.apache.lucene.sandbox.facet.ordinal_iterators.TopnOrdinalIterator;
+import org.apache.lucene.sandbox.facet.recorders.CountFacetRecorder;
+import 
org.apache.lucene.sandbox.facet.taxonomy.TaxonomyChildrenOrdinalIterator;
+import org.apache.lucene.sandbox.facet.taxonomy.TaxonomyOrdLabelBiMap;
+import org.apache.lucene.search.DocIdSetIterator;
+import org.apache.lucene.tests.util.LuceneTestCase;
+import org.apache.lucene.tests.util.TestUtil;
+import org.apache.lucene.util.BytesRef;
+
+public abstract class SandboxFacetTestCase extends LuceneTestCase {
+  // we don't have access to overall count for all facets from count recorder,
+  // and we can't compute it as a SUM of values for each facet ID because we 
need to respect cases
+  // where
+  // the same doc belongs to multiple facets (e.g. overlapping ranges and
+  // multi value fields). We can add an extra range that includes everything,
+  // or consider supporting overall count in CountFacetRecorder. But it is not 
exactly the value
+  // we can get now, as this value wouldn't respect top-n cutoff. Is this 
value a must have facets

Review Comment:
    I was under impression that it has to be sum value only for docs from top 
N, I think I misread javadoc for `FacetResult#value`, it says "Total number of 
documents containing a value for this path, **even those not included in the 
topN**.". So we actually *can* implement computing the value, just need to 
change range facets and add a facet ordinal that means "some range from the 
list".
   
   At the same time I'd suggest that we do it as a follow up task, I think it's 
ok to not have full feature parity in the first release? If you're ok with it, 
I'll just update the comment and add a TODO item for now.



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