bug fixed for WallFilter. issue #1943

src/test/java/com/alibaba/druid/bvt/filter/wall/mysql/MySqlWallTest147_optimize.java

@@ -0,0 +1,18 @@
+package com.alibaba.druid.bvt.filter.wall.mysql;
+
+import com.alibaba.druid.wall.WallProvider;
+import com.alibaba.druid.wall.spi.MySqlWallProvider;
+import junit.framework.TestCase;
+import org.junit.Assert;
+
+public class MySqlWallTest147_optimize extends TestCase {
+
+    public void test_false() throws Exception {
+        WallProvider provider = new MySqlWallProvider();
+
+        String sql = "optimize table table1";
+        Assert.assertTrue(
+                provider.checkValid(sql)
+        );
+    }
+}