the begginning

utils/funcexp/func_greatest.cpp

@@ -0,0 +1,164 @@
+/* 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_greatest.cpp 3954 2013-07-08 16:30:15Z bpaul $
+*
+*
+****************************************************************************/
+
+#include <cstdlib>
+#include <string>
+#include <sstream>
+using namespace std;
+
+#include "functor_all.h"
+#include "functioncolumn.h"
+using namespace execplan;
+
+#include "rowgroup.h"
+using namespace rowgroup;
+
+#include "joblisttypes.h"
+using namespace joblist;
+
+#include "utils_utf8.h"
+using namespace funcexp;
+
+
+class to_lower
+{
+    public:
+        char operator() (char c) const            // notice the return type
+        {
+            return tolower(c);
+        }
+};
+
+
+namespace funcexp
+{
+
+CalpontSystemCatalog::ColType Func_greatest::operationType(FunctionParm& fp, CalpontSystemCatalog::ColType& resultType)
+{
+	// operation type is not used by this functor
+	//return fp[0]->data()->resultType();
+	return resultType;
+}
+
+int64_t Func_greatest::getIntVal(rowgroup::Row& row,
+						FunctionParm& fp,
+						bool& isNull,
+						execplan::CalpontSystemCatalog::ColType& op_ct)
+{
+	double str = fp[0]->data()->getDoubleVal(row, isNull);
+
+	double greatestStr = str;
+	for (uint32_t i = 1; i < fp.size(); i++)
+	{
+		double str1 = fp[i]->data()->getDoubleVal(row, isNull);
+
+		if ( greatestStr < str1 )
+			greatestStr = str1;
+	}
+    uint64_t tmp = (uint64_t)greatestStr;
+	return (int64_t) tmp;
+}
+
+uint64_t Func_greatest::getUintVal(rowgroup::Row& row,
+						FunctionParm& fp,
+						bool& isNull,
+						execplan::CalpontSystemCatalog::ColType& op_ct)
+{
+	double str = fp[0]->data()->getDoubleVal(row, isNull);
+
+	double greatestStr = str;
+	for (uint32_t i = 1; i < fp.size(); i++)
+	{
+		double str1 = fp[i]->data()->getDoubleVal(row, isNull);
+
+		if ( greatestStr < str1 )
+			greatestStr = str1;
+	}
+
+	return (uint64_t) greatestStr;
+}
+
+double Func_greatest::getDoubleVal(rowgroup::Row& row,
+						FunctionParm& fp,
+						bool& isNull,
+						execplan::CalpontSystemCatalog::ColType& op_ct)
+{
+	double str = fp[0]->data()->getDoubleVal(row, isNull);
+
+	double greatestStr = str;
+	for (uint32_t i = 1; i < fp.size(); i++)
+	{
+		double str1 = fp[i]->data()->getDoubleVal(row, isNull);
+
+		if ( greatestStr < str1 )
+			greatestStr = str1;
+	}
+
+	return (double) greatestStr;
+}
+
+std::string Func_greatest::getStrVal(rowgroup::Row& row,
+						FunctionParm& fp,
+						bool& isNull,
+						execplan::CalpontSystemCatalog::ColType& op_ct)
+{
+	const string& str = fp[0]->data()->getStrVal(row, isNull);
+
+	string greatestStr = str;
+	for (uint32_t i = 1; i < fp.size(); i++)
+	{
+		const string& str1 = fp[i]->data()->getStrVal(row, isNull);
+
+		int tmp = utf8::idb_strcoll(greatestStr.c_str(), str1.c_str());
+		if ( tmp < 0 )
+
+//		if ( greatestStr < str1 )
+			greatestStr = str1;
+	}
+
+	return greatestStr;
+}
+
+IDB_Decimal Func_greatest::getDecimalVal(Row& row,
+							FunctionParm& fp,
+							bool& isNull,
+							CalpontSystemCatalog::ColType& ct)
+{
+//	double str = fp[0]->data()->getDoubleVal(row, isNull);
+	IDB_Decimal str = fp[0]->data()->getDecimalVal(row, isNull);
+
+	IDB_Decimal greatestStr = str;
+	for (uint32_t i = 1; i < fp.size(); i++)
+	{
+		IDB_Decimal str1 = fp[i]->data()->getDecimalVal(row, isNull);
+
+		if ( greatestStr < str1 )
+			greatestStr = str1;
+	}
+
+	return greatestStr;
+}
+
+} // namespace funcexp
+// vim:ts=4 sw=4:
+