Index: lucene/core/src/java/org/apache/lucene/index/MultiDocValues.java
===================================================================
--- lucene/core/src/java/org/apache/lucene/index/MultiDocValues.java	(revision 1449709)
+++ lucene/core/src/java/org/apache/lucene/index/MultiDocValues.java	(working copy)
@@ -397,10 +397,12 @@
   }
   
   /** implements MultiSortedDocValues over n subs, using an OrdinalMap */
-  static class MultiSortedSetDocValues extends SortedSetDocValues {
+  // nocommit public
+  public static class MultiSortedSetDocValues extends SortedSetDocValues {
     final int docStarts[];
     final SortedSetDocValues values[];
-    final OrdinalMap mapping;
+    // nocommit public
+    public final OrdinalMap mapping;
     int currentSubIndex;
     
     MultiSortedSetDocValues(SortedSetDocValues values[], int docStarts[], OrdinalMap mapping) throws IOException {
Index: lucene/facet/src/java/org/apache/lucene/facet/search/SortedSetDocValuesCollector.java
===================================================================
--- lucene/facet/src/java/org/apache/lucene/facet/search/SortedSetDocValuesCollector.java	(revision 0)
+++ lucene/facet/src/java/org/apache/lucene/facet/search/SortedSetDocValuesCollector.java	(working copy)
@@ -0,0 +1,78 @@
+package org.apache.lucene.facet.search;
+
+/*
+ * 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.
+ */
+
+import java.io.IOException;
+
+import org.apache.lucene.index.AtomicReaderContext;
+import org.apache.lucene.index.MultiDocValues.MultiSortedSetDocValues;
+import org.apache.lucene.index.MultiDocValues;
+import org.apache.lucene.index.SlowCompositeReaderWrapper;
+import org.apache.lucene.index.SortedSetDocValues;
+import org.apache.lucene.search.Collector;
+import org.apache.lucene.search.Scorer;
+
+public class SortedSetDocValuesCollector extends Collector {
+
+  final MultiDocValues.OrdinalMap ordinalMap; // for mapping per-segment
+                                              // ords to global ones
+  final String field;
+  final int[] counts;
+
+  private SortedSetDocValues segValues;
+  private int subIndex = -1;
+
+  public SortedSetDocValuesCollector(String field, SlowCompositeReaderWrapper reader) throws IOException {
+    SortedSetDocValues dv = reader.getSortedSetDocValues(field);
+    // nocommit dv isn't MultiSortedSetDV when index is optimized
+    ordinalMap = ((MultiSortedSetDocValues) dv).mapping;
+    this.field = field;
+    // nocommit must check if this overflows int!
+    counts = new int[(int) dv.getValueCount()];
+  }
+
+  @Override
+  public final boolean acceptsDocsOutOfOrder() {
+    return true;
+  }
+
+  @Override
+  public final void collect(int doc) throws IOException {
+    // nocommit change to "accumulate in the end": it's faster
+    segValues.setDocument(doc);
+    // strange do-while to collect the missing count (first ord is NO_MORE_ORDS)
+    int term = (int) segValues.nextOrd();
+    while (term > 0) {
+      counts[(int) ordinalMap.getGlobalOrd(subIndex, term)]++;
+      term = (int) segValues.nextOrd();
+    }
+  }
+
+  @Override
+  public final void setScorer(Scorer scorer) throws IOException {
+  }
+
+  @Override
+  public final void setNextReader(AtomicReaderContext context) throws IOException {
+    subIndex++;
+    segValues = context.reader().getSortedSetDocValues(field);
+    if (segValues == null) {
+      segValues = SortedSetDocValues.EMPTY;
+    }
+  }
+}

Property changes on: lucene/facet/src/java/org/apache/lucene/facet/search/SortedSetDocValuesCollector.java
___________________________________________________________________
Added: svn:eol-style
## -0,0 +1 ##
+native
\ No newline at end of property