the begginning

utils/funcexp/func_period_add.cpp

@@ -0,0 +1,98 @@
+/* Copyright (C) 2014 InfiniDB, Inc.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; version 2 of
+   the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA. */
+
+/****************************************************************************
+* $Id: func_period_add.cpp 2477 2011-04-01 16:07:35Z rdempsey $
+*
+*
+****************************************************************************/
+
+#include <cstdlib>
+#include <string>
+#include <sstream>
+using namespace std;
+
+#include "functor_int.h"
+#include "funchelpers.h"
+#include "functioncolumn.h"
+#include "rowgroup.h"
+using namespace execplan;
+
+#include "dataconvert.h"
+
+namespace funcexp
+{
+
+CalpontSystemCatalog::ColType Func_period_add::operationType( FunctionParm& fp, CalpontSystemCatalog::ColType& resultType )
+{
+	return resultType;
+}
+
+int64_t Func_period_add::getIntVal(rowgroup::Row& row,
+						FunctionParm& parm,
+						bool& isNull,
+						CalpontSystemCatalog::ColType& op_ct)
+{
+	int64_t period = parm[0]->data()->getIntVal(row, isNull);
+
+	if ( period < 10000 ) {
+		//get first 2 digits of year
+		time_t now;
+		now = time(NULL);
+		struct tm tm;
+		localtime_r(&now, &tm);
+		char timestamp[10];
+		strftime (timestamp, 10, "%Y", &tm);
+		string Syear = timestamp;
+		Syear = Syear.substr(0,2);
+		int topyear = atoi(Syear.c_str());
+		period = (topyear * 10000) + period;
+	}
+
+	int64_t year = period / 100;
+
+	int64_t month = period - (year * 100);
+
+	int64_t months = parm[1]->data()->getIntVal(row, isNull);
+
+	int64_t yearsAdd = months / 12;
+
+	int64_t monthsAdd = months - (yearsAdd * 12) ;
+
+	year = year + yearsAdd;
+	month = month + monthsAdd;
+
+	if ( month > 12 ) {
+		year++;
+		month = month - 12;
+	}
+	else
+	{
+		if ( month < 1 ) {
+			year--;
+			month = month + 12;
+		}
+	}
+
+
+	int64_t value = (year * 100) + month;
+	return value;
+}
+
+
+} // namespace funcexp
+// vim:ts=4 sw=4: