From 493f69c64e459b752af2424da93baf3ba372db44 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=AB=98=E9=93=81?= <shaojin.wensj@alibaba-inc.com>
Date: Wed, 29 Jun 2016 02:19:10 +0800
Subject: [PATCH] bug fixed db2 PageUtils.limit

---
 src/main/java/com/alibaba/druid/sql/PagerUtils.java | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/main/java/com/alibaba/druid/sql/PagerUtils.java b/src/main/java/com/alibaba/druid/sql/PagerUtils.java
index df50903727..2b67e23ee4 100644
--- a/src/main/java/com/alibaba/druid/sql/PagerUtils.java
+++ b/src/main/java/com/alibaba/druid/sql/PagerUtils.java
@@ -159,8 +159,16 @@ public class PagerUtils {
 
             SQLAggregateExpr aggregateExpr = new SQLAggregateExpr("ROW_NUMBER");
             SQLOrderBy orderBy = select.getOrderBy();
+            
+            if (orderBy == null && select.getQuery() instanceof SQLSelectQueryBlock) {
+                SQLSelectQueryBlock selectQueryBlcok = (SQLSelectQueryBlock) select.getQuery();
+                orderBy = selectQueryBlcok.getOrderBy();
+                selectQueryBlcok.setOrderBy(null);
+            } else {
+                select.setOrderBy(null);                
+            }
+            
             aggregateExpr.setOver(new SQLOver(orderBy));
-            select.setOrderBy(null);
 
             queryBlock.getSelectList().add(new SQLSelectItem(aggregateExpr, "ROWNUM"));