uschindler commented on code in PR #12314:
URL: https://github.com/apache/lucene/pull/12314#discussion_r1246177620


##########
lucene/core/src/java/org/apache/lucene/index/DocsWithVectorsSet.java:
##########
@@ -0,0 +1,112 @@
+/*
+ * 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.index;
+
+import org.apache.lucene.util.FixedBitSet;
+import org.apache.lucene.util.RamUsageEstimator;
+
+import java.util.Stack;

Review Comment:
   Please don't use the outdated `Stack` class, which is also synchronized. 
Modern replacement is `ArrayDeque` implementing `Deque` interface.



##########
lucene/core/src/java/org/apache/lucene/index/FloatVectorValues.java:
##########
@@ -57,4 +63,13 @@ public final long cost() {
    * @return the vector value
    */
   public abstract float[] vectorValue() throws IOException;
+
+  /**
+   * Return the document ID corresponding to the input vector id(ordinal)
+   * @param ord vector ID(ordinal)
+   * @return the document ID
+   */
+  public int ordToDoc(int ord){

Review Comment:
   The problem with the new implementation is that ordinal numbers need to get 
longs (like in SortedSetDocValues), because as each document of a 2B docs index 
sement may have more than one value, so the total number of ordinals may go 
beyond 2B.
   
   Of course this needs more work.



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