Github user jpountz commented on a diff in the pull request:
https://github.com/apache/lucene-solr/pull/345#discussion_r179742203
--- Diff:
lucene/core/src/java/org/apache/lucene/search/DisjunctionMatchesIterator.java
---
@@ -0,0 +1,160 @@
+/*
+ * 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 java.util.ArrayList;
+import java.util.List;
+
+import org.apache.lucene.index.LeafReaderContext;
+import org.apache.lucene.index.PostingsEnum;
+import org.apache.lucene.index.Term;
+import org.apache.lucene.index.Terms;
+import org.apache.lucene.index.TermsEnum;
+import org.apache.lucene.util.BytesRef;
+import org.apache.lucene.util.BytesRefIterator;
+import org.apache.lucene.util.PriorityQueue;
+
+/**
+ * A {@link MatchesIterator} that combines matches from a set of
sub-iterators
+ *
+ * Matches are sorted by their start positions, and then by their end
positions, so that
+ * prefixes sort first. Matches may overlap, or be duplicated if they
appear in more
+ * than one of the sub-iterators.
+ */
+public final class DisjunctionMatchesIterator implements MatchesIterator {
+
+ /**
+ * Create a {@link DisjunctionMatchesIterator} over a list of terms
+ *
+ * Only terms that have at least one match in the given document will be
included
+ */
+ public static DisjunctionMatchesIterator fromTerms(LeafReaderContext
context, int doc, String field, List<Term> terms) throws IOException {
+ return fromTermsEnum(context, doc, field, asBytesRefIterator(terms));
+ }
+
+ private static BytesRefIterator asBytesRefIterator(List<Term> terms) {
+ return new BytesRefIterator() {
+ int i = 0;
+ @Override
+ public BytesRef next() {
+ if (i >= terms.size())
+ return null;
+ return terms.get(i++).bytes();
+ }
+ };
+ }
+
+ /**
+ * Create a {@link DisjunctionMatchesIterator} over a list of terms
extracted from a {@link BytesRefIterator}
+ *
+ * Only terms that have at least one match in the given document will be
included
+ */
+ public static DisjunctionMatchesIterator fromTermsEnum(LeafReaderContext
context, int doc, String field, BytesRefIterator terms) throws IOException {
--- End diff --
maybe return MatchesIterator? the impl shouldn't matter
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