Github user jimczi commented on a diff in the pull request:
https://github.com/apache/lucene-solr/pull/495#discussion_r231992058
--- Diff:
lucene/core/src/test/org/apache/lucene/search/TestConstantScoreScorer.java ---
@@ -0,0 +1,104 @@
+/*
+ * 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 org.apache.lucene.document.Document;
+import org.apache.lucene.document.Field;
+import org.apache.lucene.index.IndexReader;
+import org.apache.lucene.index.LeafReaderContext;
+import org.apache.lucene.index.RandomIndexWriter;
+import org.apache.lucene.index.Term;
+import org.apache.lucene.store.Directory;
+import org.apache.lucene.util.LuceneTestCase;
+
+import static org.apache.lucene.search.BooleanClause.Occur;
+import static org.apache.lucene.search.DocIdSetIterator.NO_MORE_DOCS;
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.hamcrest.CoreMatchers.is;
+
+public class TestConstantScoreScorer extends LuceneTestCase {
+ private static final String FIELD = "f";
+ private static final String[] VALUES = new String[]{"foo", "bar", "foo
bar", "azerty"};
+
+ public void testBasics() throws Exception {
+ try (final TestConstantScoreScorerIndex index = new
TestConstantScoreScorerIndex()) {
+ BooleanQuery query = new BooleanQuery.Builder()
+ .add(new ConstantScoreQuery(new TermQuery(new Term(FIELD,
"foo"))), Occur.MUST)
+ .build();
+
+ final ConstantScoreScorer scorer = index.constantScoreScorer(query,
1f);
+ assertThat(scorer.iterator().nextDoc(), equalTo(0));
+ assertThat(scorer.score(), is(equalTo(1f)));
+ assertThat(scorer.iterator().nextDoc(), equalTo(2));
+ assertThat(scorer.score(), is(equalTo(1f)));
+ assertThat(scorer.iterator().nextDoc(), equalTo(NO_MORE_DOCS));
+ }
+ }
+
+ public void testWithMinCompetitiveScoreSet() throws Exception {
+ try (final TestConstantScoreScorerIndex index = new
TestConstantScoreScorerIndex()) {
+ BooleanQuery query = new BooleanQuery.Builder()
+ .add(new ConstantScoreQuery(new TermQuery(new Term(FIELD,
"foo"))), Occur.MUST)
+ .build();
+
+ final ConstantScoreScorer scorer = index.constantScoreScorer(query,
1f);
+ assertThat(scorer.iterator().nextDoc(), equalTo(0));
+ assertThat(scorer.score(), is(equalTo(1f)));
+ scorer.setMinCompetitiveScore(2f);
+ assertThat(scorer.iterator().nextDoc(), equalTo(NO_MORE_DOCS));
+ }
+ }
+
+ static class TestConstantScoreScorerIndex implements AutoCloseable {
+
+ private final Directory directory;
+ private final RandomIndexWriter writer;
+ private final IndexReader reader;
+
+ TestConstantScoreScorerIndex() throws IOException {
+ directory = newDirectory();
+
+ writer = new RandomIndexWriter(random(), directory);
--- End diff --
you need to use a merger that retains doc id order. Something like:
```
RandomIndexWriter w = new RandomIndexWriter(random(), dir,
newIndexWriterConfig().setMergePolicy(
// retain doc id order
newLogMergePolicy(random().nextBoolean())));
```
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