improve WallFilter, support intersectAllow

src/test/java/com/alibaba/druid/bvt/filter/wall/IntersectTest.java

@@ -0,0 +1,23 @@
+package com.alibaba.druid.bvt.filter.wall;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.wall.WallConfig;
+import com.alibaba.druid.wall.WallUtils;
+
+public class IntersectTest extends TestCase {
+
+    public void test_false() throws Exception {
+        Assert.assertFalse(WallUtils.isValidateOracle(//
+        "SELECT * FROM A MINUS SELECT * FROM B")); //
+    }
+
+    public void test_true() throws Exception {
+        WallConfig config = new WallConfig();
+        config.setMinusAllow(true);
+        Assert.assertTrue(WallUtils.isValidateOracle(//
+        "SELECT * FROM A MINUS SELECT * FROM B", config)); //
+    }
+}

src/test/java/com/alibaba/druid/bvt/filter/wall/MinusTest.java

@@ -11,13 +11,13 @@ public class MinusTest extends TestCase {
 
     public void test_false() throws Exception {
         Assert.assertFalse(WallUtils.isValidateOracle(//
-        "SELECT * FROM A MINUS SELECT * FROM B")); //
+        "SELECT * FROM A Intersect SELECT * FROM B")); //
     }
 
     public void test_true() throws Exception {
         WallConfig config = new WallConfig();
-        config.setMinusAllow(true);
+        config.setIntersectAllow(true);
         Assert.assertTrue(WallUtils.isValidateOracle(//
-        "SELECT * FROM A MINUS SELECT * FROM B", config)); //
+        "SELECT * FROM A Intersect SELECT * FROM B", config)); //
     }
 }