Index: lucene/contrib/misc/src/java/org/apache/lucene/index/IndexSorter.java
===================================================================
--- lucene/contrib/misc/src/java/org/apache/lucene/index/IndexSorter.java	(revision 1036920)
+++ lucene/contrib/misc/src/java/org/apache/lucene/index/IndexSorter.java	(working copy)
@@ -183,6 +183,11 @@
       }
     }
 
+    @Override
+    public IndexReader[] getSequentialSubReaders() {
+      return null;
+    }
+
     public Document document(int n) throws IOException {
       return document(n, null);
     }
Index: lucene/contrib/misc/src/java/org/apache/lucene/index/MultiPassIndexSplitter.java
===================================================================
--- lucene/contrib/misc/src/java/org/apache/lucene/index/MultiPassIndexSplitter.java	(revision 1036920)
+++ lucene/contrib/misc/src/java/org/apache/lucene/index/MultiPassIndexSplitter.java	(working copy)
@@ -221,6 +221,11 @@
     }
 
     @Override
+    public IndexReader[] getSequentialSubReaders() {
+      return null;
+    }
+
+    @Override
     public TermPositions termPositions() throws IOException {
       return new FilterTermPositions(in.termPositions()) {
 
Index: lucene/src/java/org/apache/lucene/index/SegmentMerger.java
===================================================================
--- lucene/src/java/org/apache/lucene/index/SegmentMerger.java	(revision 1036920)
+++ lucene/src/java/org/apache/lucene/index/SegmentMerger.java	(working copy)
@@ -30,6 +30,7 @@
 import org.apache.lucene.store.Directory;
 import org.apache.lucene.store.IndexInput;
 import org.apache.lucene.store.IndexOutput;
+import org.apache.lucene.util.ReaderUtil;
 
 /**
  * The SegmentMerger class combines two or more Segments, represented by an IndexReader ({@link #add},
@@ -113,19 +114,10 @@
    * @param reader
    */
   final void add(IndexReader reader) {
-    readers.add(reader);
+    ReaderUtil.gatherSubReaders(readers, reader);
   }
 
   /**
-   * 
-   * @param i The index of the reader to return
-   * @return The ith reader to be merged
-   */
-  final IndexReader segmentReader(int i) {
-    return readers.get(i);
-  }
-
-  /**
    * Merges the readers specified by the {@link #add} method into the directory passed to the constructor
    * @return The number of documents that were merged
    * @throws CorruptIndexException if the index is corrupt
@@ -456,7 +448,7 @@
         final SegmentReader matchingSegmentReader = matchingSegmentReaders[idx++];
         TermVectorsReader matchingVectorsReader = null;
         if (matchingSegmentReader != null) {
-          TermVectorsReader vectorsReader = matchingSegmentReader.getTermVectorsReaderOrig();
+          TermVectorsReader vectorsReader = matchingSegmentReader.getTermVectorsReader();
 
           // If the TV* files are an older format then they cannot read raw docs:
           if (vectorsReader != null && vectorsReader.canReadRawDocs()) {
@@ -731,7 +723,7 @@
             output = directory.createOutput(IndexFileNames.segmentFileName(segment, IndexFileNames.NORMS_EXTENSION));
             output.writeBytes(NORMS_HEADER,NORMS_HEADER.length);
           }
-          for ( IndexReader reader : readers) {
+          for (IndexReader reader : readers) {
             int maxDoc = reader.maxDoc();
             if (normBuffer == null || normBuffer.length < maxDoc) {
               // the buffer is too small for the current segment