revert the referenceentry change
diff --git a/hyracks/hyracks-dataflow-std/src/main/java/edu/uci/ics/hyracks/dataflow/std/util/ReferenceEntry.java b/hyracks/hyracks-dataflow-std/src/main/java/edu/uci/ics/hyracks/dataflow/std/util/ReferenceEntry.java
index 5f78362..c1efa91 100644
--- a/hyracks/hyracks-dataflow-std/src/main/java/edu/uci/ics/hyracks/dataflow/std/util/ReferenceEntry.java
+++ b/hyracks/hyracks-dataflow-std/src/main/java/edu/uci/ics/hyracks/dataflow/std/util/ReferenceEntry.java
@@ -20,7 +20,6 @@
     private final int runid;
     private FrameTupleAccessor acccessor;
     private int tupleIndex;
-    private int tupleOffset;
 
     public ReferenceEntry(int runid, FrameTupleAccessor fta, int tupleIndex) {
         super();