bug fixed for WallFilter deny show table statement. issue #1380

src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest145.java

@@ -0,0 +1,20 @@
+package com.alibaba.druid.bvt.filter.wall;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.wall.WallProvider;
+import com.alibaba.druid.wall.spi.MySqlWallProvider;
+
+public class MySqlWallTest145 extends TestCase {
+
+    public void test_false() throws Exception {
+        WallProvider provider = new MySqlWallProvider();
+
+        String sql = "SHOW FULL TABLES WHERE Table_type != 'VIEW'";
+        Assert.assertTrue(
+                provider.checkValid(sql)
+        );
+    }
+}