the begginning

utils/funcexp/func_period_diff.cpp

@@ -0,0 +1,156 @@
+/* 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_diff.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
+{
+#define YY_PART_YEAR 70
+
+inline int64_t convert_period_to_month(int64_t period)
+{
+  int64_t a,b;
+  if (period == 0)
+    return 0L;
+  if ((a=period/100) < YY_PART_YEAR)
+    a+=2000;
+  else if (a < 100)
+    a+=1900;
+  b=period%100;
+  return a*12+b-1;
+}
+
+
+CalpontSystemCatalog::ColType Func_period_diff::operationType( FunctionParm& fp, CalpontSystemCatalog::ColType& resultType )
+{
+	return resultType;
+}
+
+int64_t Func_period_diff::getIntVal(rowgroup::Row& row,
+						FunctionParm& parm,
+						bool& isNull,
+						CalpontSystemCatalog::ColType& op_ct)
+{
+	int64_t period1 = 0;
+
+	switch (parm[0]->data()->resultType().colDataType)
+	{
+		case execplan::CalpontSystemCatalog::BIGINT:
+		case execplan::CalpontSystemCatalog::INT:
+		case execplan::CalpontSystemCatalog::MEDINT:
+		case execplan::CalpontSystemCatalog::TINYINT:
+		case execplan::CalpontSystemCatalog::SMALLINT:
+		case execplan::CalpontSystemCatalog::DATE:
+		case execplan::CalpontSystemCatalog::DATETIME:
+		{
+			period1 = parm[0]->data()->getIntVal(row, isNull);
+			break;
+		}
+		case execplan::CalpontSystemCatalog::DECIMAL:
+        case execplan::CalpontSystemCatalog::UDECIMAL:
+		{
+			IDB_Decimal d = parm[0]->data()->getDecimalVal(row, isNull);
+			period1 = d.value / helpers::power(d.scale);
+			break;
+		}
+		case execplan::CalpontSystemCatalog::VARCHAR:
+		case execplan::CalpontSystemCatalog::CHAR:
+		{
+			period1 = atoi(parm[0]->data()->getStrVal(row, isNull).c_str());
+			break;
+		}
+		case execplan::CalpontSystemCatalog::DOUBLE:
+		case execplan::CalpontSystemCatalog::FLOAT:
+		{
+			period1 = (int64_t) parm[0]->data()->getDoubleVal(row, isNull);
+			break;
+		}
+		default:
+		{
+			isNull = true;
+		}
+	}
+
+	if (isNull)
+		return 0;
+
+	int64_t period2 = 0;
+
+	switch (parm[1]->data()->resultType().colDataType)
+	{
+		case execplan::CalpontSystemCatalog::BIGINT:
+		case execplan::CalpontSystemCatalog::INT:
+		case execplan::CalpontSystemCatalog::MEDINT:
+		case execplan::CalpontSystemCatalog::TINYINT:
+		case execplan::CalpontSystemCatalog::SMALLINT:
+		case execplan::CalpontSystemCatalog::DATE:
+		case execplan::CalpontSystemCatalog::DATETIME:
+		{
+			period2 = parm[1]->data()->getIntVal(row, isNull);
+			break;
+		}
+		case execplan::CalpontSystemCatalog::DECIMAL:
+        case execplan::CalpontSystemCatalog::UDECIMAL:
+		{
+			IDB_Decimal d = parm[1]->data()->getDecimalVal(row, isNull);
+			period2 = d.value / helpers::power(d.scale);
+			break;
+		}
+		case execplan::CalpontSystemCatalog::VARCHAR:
+		case execplan::CalpontSystemCatalog::CHAR:
+		{
+			period2 = atoi(parm[1]->data()->getStrVal(row, isNull).c_str());
+			break;
+		}
+		case execplan::CalpontSystemCatalog::DOUBLE:
+		case execplan::CalpontSystemCatalog::FLOAT:
+		{
+			period2 = (int64_t) parm[1]->data()->getDoubleVal(row, isNull);
+			break;
+		}
+		default:
+		{
+			isNull = true;
+		}
+	}
+
+	if (isNull)
+		return 0;
+
+	return convert_period_to_month(period1) - convert_period_to_month(period2);
+}
+
+
+} // namespace funcexp
+// vim:ts=4 sw=4: