the begginning

utils/funcexp/func_from_days.cpp

@@ -0,0 +1,92 @@
+/* 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_from_days.cpp 3921 2013-06-19 18:59:56Z bwilkinson $
+*
+*
+****************************************************************************/
+
+#include <cstdlib>
+#include <string>
+#include <sstream>
+using namespace std;
+
+#include "functor_dtm.h"
+#include "funchelpers.h"
+#include "functioncolumn.h"
+#include "rowgroup.h"
+using namespace execplan;
+
+#include "dataconvert.h"
+using namespace dataconvert;
+
+namespace funcexp
+{
+
+CalpontSystemCatalog::ColType Func_from_days::operationType( FunctionParm& fp, CalpontSystemCatalog::ColType& resultType )
+{
+	return resultType;
+}
+
+int64_t Func_from_days::getIntVal(rowgroup::Row& row,
+						FunctionParm& parm,
+						bool& isNull,
+						CalpontSystemCatalog::ColType& op_ct)
+{
+	return getDatetimeIntVal(row, parm, isNull, op_ct);
+}
+
+string Func_from_days::getStrVal(rowgroup::Row& row,
+							FunctionParm& parm,
+							bool& isNull,
+							CalpontSystemCatalog::ColType& ct)
+{
+	return intToString(getIntVal(row, parm, isNull, ct));
+}
+
+int32_t Func_from_days::getDateIntVal(rowgroup::Row& row,
+							FunctionParm& parm,
+							bool& isNull,
+							CalpontSystemCatalog::ColType& ct)
+{
+	return (((getDatetimeIntVal(row, parm, isNull, ct) >> 32) & 0xFFFFFFC0) | 0x3E);
+}
+
+int64_t Func_from_days::getDatetimeIntVal(rowgroup::Row& row,
+							FunctionParm& parm,
+							bool& isNull,
+							CalpontSystemCatalog::ColType& ct)
+{
+	double val1 = parm[0]->data()->getDoubleVal(row, isNull);
+	int64_t daynr = (int64_t)(val1 > 0 ? val1 + 0.5 : val1 - 0.5);
+
+	DateTime aDaytime;
+	helpers::get_date_from_mysql_daynr( daynr, aDaytime );
+	
+	// to be safe
+	aDaytime.hour = 0;
+	aDaytime.minute = 0;
+	aDaytime.second = 0;
+	aDaytime.msecond = 0;
+
+	return (*(reinterpret_cast<uint64_t *> (&aDaytime)));
+}
+
+
+} // namespace funcexp
+// vim:ts=4 sw=4: