mikemccand commented on a change in pull request #923: LUCENE-8988: Introduce 
Global Feature Based Early Termination For Sorted Fields
URL: https://github.com/apache/lucene-solr/pull/923#discussion_r335023015
 
 

 ##########
 File path: lucene/core/src/java/org/apache/lucene/search/FieldValueChecker.java
 ##########
 @@ -0,0 +1,114 @@
+/*
+ * 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;
+
+/**
+ * Maintains bottom feature value across multiple collectors
+ */
+public class FieldValueChecker {
+  public volatile Object value;
+  public volatile int minimumDoc;
+  private FieldComparator[] fieldComparators;
+  private int[] reverseMul;
+  private boolean isEnabled = true;
+
+  public FieldValueChecker(final FieldComparator[] fieldComparators, final 
int[] reverseMul) {
+    assert fieldComparators.length == reverseMul.length;
+
+    this.fieldComparators = fieldComparators;
+    this.reverseMul = reverseMul;
+  }
+
+  void disableGlobalHitCheck() {
+    isEnabled = false;
+  }
+
+  boolean isBottomValuePresent() {
+    if (!isEnabled) {
 
 Review comment:
   `isEnabled == false`?

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