7536ed
@@ -5370,8 +5370,8 @@
private Operator genGroupByPlan1ReduceMultiGBY(List<String> dests, QB qb, Operat
 
         GenericUDFOPOr or = new GenericUDFOPOr();
         List<ExprNodeDesc> expressions = new ArrayList<ExprNodeDesc>(2);
-        expressions.add(previous);
         expressions.add(current);
+        expressions.add(previous);
         ExprNodeDesc orExpr =
             new ExprNodeGenericFuncDesc(TypeInfoFactory.booleanTypeInfo, or, expressions);
         previous = orExpr;
