romseygeek commented on code in PR #16070:
URL: https://github.com/apache/lucene/pull/16070#discussion_r3247287740


##########
lucene/core/src/java/org/apache/lucene/search/SortedSkipperScorerSupplier.java:
##########
@@ -0,0 +1,177 @@
+/*
+ * 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.search;
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.util.function.LongPredicate;
+import org.apache.lucene.index.DocValuesSkipper;
+
+/**
+ * Constant-score supplier that uses a {@link DocValuesSkipper} to approximate 
the document interval
+ * matching a numeric or ordinal range when the leaf's primary {@link 
SortField} aligns with that
+ * field.
+ *
+ * <p>The skipper yields coarse min/max doc IDs that contain all matching 
documents. When the
+ * skipper interval at a boundary is not exact for the query range, {@link 
#nextDoc} scans forward
+ * from that doc to the first document whose value satisfies the appropriate 
comparison, producing a
+ * tight {@link DocIdSetIterator#range} iterator.
+ *
+ * @lucene.internal
+ */
+public abstract class SortedSkipperScorerSupplier extends 
ConstantScoreScorerSupplier {

Review Comment:
   Let's make this package private?



##########
lucene/core/src/java/org/apache/lucene/document/SortedSetDocValuesRangeQuery.java:
##########
@@ -167,120 +168,39 @@ private ScorerSupplier 
getScorerSupplierFromDensePrimarySort(
           SortedDocValues singleton,
           SortedSetDocValues values,
           DocValuesSkipper skipper) {
-        final Sort indexSort = context.reader().getMetaData().sort();
-        return new ConstantScoreScorerSupplier(score(), scoreMode, 
context.reader().maxDoc()) {
-          int skipperMinDocId = -1, skipperMaxDocId = -1;
-          long minOrd, maxOrd;
-          boolean skipperMinDocIdExact = false, skipperMaxDocIdExact = false;
+        final SortField sortField = 
context.reader().getMetaData().sort().getSort()[0];

Review Comment:
   This feels a bit dangerous - maybe we can change isDensePrimarySort() to 
return the primary SortField if it exists and then pass it to this method?



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