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package org.apache.lucene.index;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import java.io.IOException;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.Random;
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import org.apache.lucene.analysis.MockAnalyzer;
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import org.apache.lucene.document.Document;
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import org.apache.lucene.document.Field;
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import org.apache.lucene.document.MapFieldSelector;
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import org.apache.lucene.search.BooleanQuery;
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import org.apache.lucene.search.IndexSearcher;
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import org.apache.lucene.search.Query;
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import org.apache.lucene.search.ScoreDoc;
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import org.apache.lucene.search.TermQuery;
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import org.apache.lucene.search.BooleanClause.Occur;
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import org.apache.lucene.store.Directory;
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import org.apache.lucene.util.LuceneTestCase;
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public class TestParallelReader extends LuceneTestCase {
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private IndexSearcher parallel;
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private IndexSearcher single;
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private Directory dir, dir1, dir2;
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public void setUp() throws Exception {
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single = single(random);
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parallel = parallel(random);
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public void tearDown() throws Exception {
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single.getIndexReader().close();
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parallel.getIndexReader().close();
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public void testQueries() throws Exception {
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queryTest(new TermQuery(new Term("f1", "v1")));
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queryTest(new TermQuery(new Term("f1", "v2")));
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queryTest(new TermQuery(new Term("f2", "v1")));
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queryTest(new TermQuery(new Term("f2", "v2")));
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queryTest(new TermQuery(new Term("f3", "v1")));
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queryTest(new TermQuery(new Term("f3", "v2")));
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queryTest(new TermQuery(new Term("f4", "v1")));
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queryTest(new TermQuery(new Term("f4", "v2")));
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BooleanQuery bq1 = new BooleanQuery();
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bq1.add(new TermQuery(new Term("f1", "v1")), Occur.MUST);
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bq1.add(new TermQuery(new Term("f4", "v1")), Occur.MUST);
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public void testFieldNames() throws Exception {
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Directory dir1 = getDir1(random);
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Directory dir2 = getDir2(random);
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ParallelReader pr = new ParallelReader();
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pr.add(IndexReader.open(dir1, false));
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pr.add(IndexReader.open(dir2, false));
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Collection<String> fieldNames = pr.getFieldNames(IndexReader.FieldOption.ALL);
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assertEquals(4, fieldNames.size());
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assertTrue(fieldNames.contains("f1"));
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assertTrue(fieldNames.contains("f2"));
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assertTrue(fieldNames.contains("f3"));
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assertTrue(fieldNames.contains("f4"));
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public void testDocument() throws IOException {
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Directory dir1 = getDir1(random);
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Directory dir2 = getDir2(random);
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ParallelReader pr = new ParallelReader();
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pr.add(IndexReader.open(dir1, false));
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pr.add(IndexReader.open(dir2, false));
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Document doc11 = pr.document(0, new MapFieldSelector(new String[] {"f1"}));
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Document doc24 = pr.document(1, new MapFieldSelector(Arrays.asList(new String[] {"f4"})));
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Document doc223 = pr.document(1, new MapFieldSelector(new String[] {"f2", "f3"}));
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assertEquals(1, doc11.getFields().size());
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assertEquals(1, doc24.getFields().size());
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assertEquals(2, doc223.getFields().size());
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assertEquals("v1", doc11.get("f1"));
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assertEquals("v2", doc24.get("f4"));
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assertEquals("v2", doc223.get("f2"));
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assertEquals("v2", doc223.get("f3"));
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public void testIncompatibleIndexes() throws IOException {
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Directory dir1 = getDir1(random);
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// one document only:
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Directory dir2 = newDirectory();
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IndexWriter w2 = new IndexWriter(dir2, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));
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Document d3 = new Document();
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d3.add(newField("f3", "v1", Field.Store.YES, Field.Index.ANALYZED));
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ParallelReader pr = new ParallelReader();
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pr.add(IndexReader.open(dir1, false));
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IndexReader ir = IndexReader.open(dir2, false);
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fail("didn't get exptected exception: indexes don't have same number of documents");
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} catch (IllegalArgumentException e) {
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// expected exception
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public void testIsCurrent() throws IOException {
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Directory dir1 = getDir1(random);
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Directory dir2 = getDir2(random);
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ParallelReader pr = new ParallelReader();
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pr.add(IndexReader.open(dir1, false));
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pr.add(IndexReader.open(dir2, false));
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assertTrue(pr.isCurrent());
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IndexReader modifier = IndexReader.open(dir1, false);
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modifier.setNorm(0, "f1", 100);
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// one of the two IndexReaders which ParallelReader is using
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// is not current anymore
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assertFalse(pr.isCurrent());
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modifier = IndexReader.open(dir2, false);
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modifier.setNorm(0, "f3", 100);
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// now both are not current anymore
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assertFalse(pr.isCurrent());
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public void testAllTermDocs() throws IOException {
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Directory dir1 = getDir1(random);
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Directory dir2 = getDir2(random);
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ParallelReader pr = new ParallelReader();
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pr.add(IndexReader.open(dir1, false));
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pr.add(IndexReader.open(dir2, false));
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TermDocs td = pr.termDocs(null);
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for(int i=0;i<NUM_DOCS;i++) {
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assertTrue(td.next());
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assertEquals(i, td.doc());
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assertEquals(1, td.freq());
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private void queryTest(Query query) throws IOException {
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ScoreDoc[] parallelHits = parallel.search(query, null, 1000).scoreDocs;
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ScoreDoc[] singleHits = single.search(query, null, 1000).scoreDocs;
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assertEquals(parallelHits.length, singleHits.length);
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for(int i = 0; i < parallelHits.length; i++) {
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assertEquals(parallelHits[i].score, singleHits[i].score, 0.001f);
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Document docParallel = parallel.doc(parallelHits[i].doc);
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Document docSingle = single.doc(singleHits[i].doc);
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assertEquals(docParallel.get("f1"), docSingle.get("f1"));
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assertEquals(docParallel.get("f2"), docSingle.get("f2"));
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assertEquals(docParallel.get("f3"), docSingle.get("f3"));
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assertEquals(docParallel.get("f4"), docSingle.get("f4"));
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// Fields 1-4 indexed together:
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private IndexSearcher single(Random random) throws IOException {
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dir = newDirectory();
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IndexWriter w = new IndexWriter(dir, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));
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Document d1 = new Document();
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d1.add(newField("f1", "v1", Field.Store.YES, Field.Index.ANALYZED));
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d1.add(newField("f2", "v1", Field.Store.YES, Field.Index.ANALYZED));
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d1.add(newField("f3", "v1", Field.Store.YES, Field.Index.ANALYZED));
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d1.add(newField("f4", "v1", Field.Store.YES, Field.Index.ANALYZED));
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Document d2 = new Document();
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d2.add(newField("f1", "v2", Field.Store.YES, Field.Index.ANALYZED));
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d2.add(newField("f2", "v2", Field.Store.YES, Field.Index.ANALYZED));
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d2.add(newField("f3", "v2", Field.Store.YES, Field.Index.ANALYZED));
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d2.add(newField("f4", "v2", Field.Store.YES, Field.Index.ANALYZED));
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return new IndexSearcher(dir, false);
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// Fields 1 & 2 in one index, 3 & 4 in other, with ParallelReader:
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private IndexSearcher parallel(Random random) throws IOException {
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dir1 = getDir1(random);
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dir2 = getDir2(random);
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ParallelReader pr = new ParallelReader();
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pr.add(IndexReader.open(dir1, false));
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pr.add(IndexReader.open(dir2, false));
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return newSearcher(pr);
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private Directory getDir1(Random random) throws IOException {
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Directory dir1 = newDirectory();
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IndexWriter w1 = new IndexWriter(dir1, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));
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Document d1 = new Document();
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d1.add(newField("f1", "v1", Field.Store.YES, Field.Index.ANALYZED));
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d1.add(newField("f2", "v1", Field.Store.YES, Field.Index.ANALYZED));
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Document d2 = new Document();
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d2.add(newField("f1", "v2", Field.Store.YES, Field.Index.ANALYZED));
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d2.add(newField("f2", "v2", Field.Store.YES, Field.Index.ANALYZED));
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private Directory getDir2(Random random) throws IOException {
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Directory dir2 = newDirectory();
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IndexWriter w2 = new IndexWriter(dir2, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));
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Document d3 = new Document();
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d3.add(newField("f3", "v1", Field.Store.YES, Field.Index.ANALYZED));
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d3.add(newField("f4", "v1", Field.Store.YES, Field.Index.ANALYZED));
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Document d4 = new Document();
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d4.add(newField("f3", "v2", Field.Store.YES, Field.Index.ANALYZED));
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d4.add(newField("f4", "v2", Field.Store.YES, Field.Index.ANALYZED));