benwtrent commented on code in PR #12657:
URL: https://github.com/apache/lucene/pull/12657#discussion_r1360502250


##########
lucene/core/src/java/org/apache/lucene/util/hnsw/InitializedHnswGraphBuilder.java:
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@@ -0,0 +1,78 @@
+/*
+ * 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.util.hnsw;
+
+import static org.apache.lucene.search.DocIdSetIterator.NO_MORE_DOCS;
+
+import java.io.IOException;
+import java.util.Map;
+import java.util.Set;
+import org.apache.lucene.util.CollectionUtil;
+
+/**
+ * This creates a graph builder that is initialized with the provided 
HnswGraph. This is useful for
+ * merging HnswGraphs from multiple segments.
+ *
+ * @lucene.internal
+ */
+public final class InitializedHnswGraphBuilder extends HnswGraphBuilder {

Review Comment:
   @msokolov I think we can just have `int[]`, where `int[oldOrd]=newOrd` since 
old vector ordinals are continuous.



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