From 8364dcc49f48f45fab1f97764f577785f45cbea7 Mon Sep 17 00:00:00 2001
From: Yako <yako@YakotekiMacBook-Pro.local>
Date: Fri, 17 Oct 2014 22:32:13 +0800
Subject: [PATCH] improve sqlwall

---
 .../com/alibaba/druid/wall/spi/WallVisitorUtils.java  | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/main/java/com/alibaba/druid/wall/spi/WallVisitorUtils.java b/src/main/java/com/alibaba/druid/wall/spi/WallVisitorUtils.java
index 0bba971376..81fecd25b6 100644
--- a/src/main/java/com/alibaba/druid/wall/spi/WallVisitorUtils.java
+++ b/src/main/java/com/alibaba/druid/wall/spi/WallVisitorUtils.java
@@ -2182,16 +2182,25 @@ public class WallVisitorUtils {
         if (query instanceof SQLSelectQueryBlock) {
             SQLSelectQueryBlock queryBlock = (SQLSelectQueryBlock) query;
             SQLTableSource from = queryBlock.getFrom();
+            
+            if (queryBlock.getSelectList().size() < 1) {
+                return false;
+            }
 
             if (from == null) {
                 boolean itemIsConst = true;
+                boolean itemHasAlias = false;
                 for (SQLSelectItem item : queryBlock.getSelectList()) {
                     if (item.getExpr() instanceof SQLIdentifierExpr || item.getExpr() instanceof SQLPropertyExpr) {
                         itemIsConst = false;
                         break;
                     }
+                    if(item.getAlias() != null ) {
+                        itemHasAlias = true;
+                        break;
+                    }
                 }
-                if (itemIsConst) {
+                if (itemIsConst && !itemHasAlias) {
                     return true;
                 } else {
                     return false;