chore(codestyle): mark virtual methods as override

utils/windowfunction/wf_count.cpp

@@ -17,29 +17,19 @@
 
 //  $Id: wf_count.cpp 3932 2013-06-25 16:08:10Z xlou $
 
-//#define NDEBUG
-#include <iostream>
-#include <cassert>
+// #define NDEBUG
 #include <cmath>
-#include <sstream>
-#include <iomanip>
 using namespace std;
 
 #include <boost/shared_ptr.hpp>
 using namespace boost;
 
 #include "loggingid.h"
-#include "errorcodes.h"
-#include "idberrorinfo.h"
 using namespace logging;
 
-#include "rowgroup.h"
-using namespace rowgroup;
-
 #include "idborderby.h"
 using namespace ordering;
 
-#include "joblisttypes.h"
 #include "calpontsystemcatalog.h"
 using namespace execplan;