Index: java/org/apache/lucene/search/DisjunctionSumScorer.java
===================================================================
--- java/org/apache/lucene/search/DisjunctionSumScorer.java	(revision 614534)
+++ java/org/apache/lucene/search/DisjunctionSumScorer.java	(working copy)
@@ -50,7 +50,6 @@
    * and all scorers are after the matching doc, or are exhausted.
    */
   private ScorerDocQueue scorerDocQueue = null;
-  private int queueSize = -1; // used to avoid size() method calls on scorerDocQueue
   
   /** The document number of the current match. */
   private int currentDoc = -1;
@@ -99,13 +98,10 @@
   private void initScorerDocQueue() throws IOException {
     Iterator si = subScorers.iterator();
     scorerDocQueue = new ScorerDocQueue(nrScorers);
-    queueSize = 0;
     while (si.hasNext()) {
       Scorer se = (Scorer) si.next();
       if (se.next()) { // doc() method will be used in scorerDocQueue.
-        if (scorerDocQueue.insert(se)) {
-          queueSize++;
-        }
+        scorerDocQueue.insert(se);
       }
     }
   }
@@ -173,7 +169,7 @@
       nrMatchers = 1;
       do { // Until all subscorers are after currentDoc
         if (! scorerDocQueue.topNextAndAdjustElsePop()) {
-          if (--queueSize == 0) {
+          if (scorerDocQueue.size() == 0) {
             break; // nothing more to advance, check for last match.
           }
         }
@@ -186,7 +182,7 @@
       
       if (nrMatchers >= minimumNrMatchers) {
         return true;
-      } else if (queueSize < minimumNrMatchers) {
+      } else if (scorerDocQueue.size() < minimumNrMatchers) {
         return false;
       }
     } while (true);
@@ -217,7 +213,7 @@
     if (scorerDocQueue == null) {
       initScorerDocQueue();
     }
-    if (queueSize < minimumNrMatchers) {
+    if (scorerDocQueue.size() < minimumNrMatchers) {
       return false;
     }
     if (target <= currentDoc) {
@@ -227,7 +223,7 @@
       if (scorerDocQueue.topDoc() >= target) {
         return advanceAfterCurrent();
       } else if (! scorerDocQueue.topSkipToAndAdjustElsePop(target)) {
-        if (--queueSize < minimumNrMatchers) {
+        if (scorerDocQueue.size() < minimumNrMatchers) {
           return false;
         }
       }