fix

Author: michaelzhao820

src/test/java/org/ogo/test/datastructuretests/DataStructureTest.java

@@ -22,7 +22,8 @@ public static void initQueryEngine() throws InterruptedException, IOException, N
             OGO.followRoot = true;
             OGO.whitelist = true;
             queryEngineInitialized = true;
+            OGO.clearDatabase = OGOProperties.getClearDatabase();
+
         }
-        OGO.clearDatabase = OGOProperties.getClearDatabase();
     }
 }