the begginning

utils/funcexp/func_strcmp.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_strcmp.cpp 2477 2011-04-01 16:07:35Z rdempsey $
+*
+*
+****************************************************************************/
+
+#include <cstdlib>
+#include <string>
+#include <sstream>
+using namespace std;
+
+#include "functor_int.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_strcmp::operationType(FunctionParm& fp, CalpontSystemCatalog::ColType& resultType)
+{
+	// operation type is not used by this functor
+	//return fp[0]->data()->resultType();
+	return resultType;
+}
+
+int64_t Func_strcmp::getIntVal(rowgroup::Row& row,
+						FunctionParm& fp,
+						bool& isNull,
+						execplan::CalpontSystemCatalog::ColType& op_ct)
+{
+	const string& str = fp[0]->data()->getStrVal(row, isNull);
+
+	const string& str1 = fp[1]->data()->getStrVal(row, isNull);
+	int ret = utf8::idb_strcoll(str.c_str(), str1.c_str());
+	// mysql's strcmp returns only -1, 0, and 1
+	return (ret < 0 ? -1 : (ret > 0 ? 1 : 0));
+}
+
+
+std::string Func_strcmp::getStrVal(rowgroup::Row& row,
+						FunctionParm& fp,
+						bool& isNull,
+						execplan::CalpontSystemCatalog::ColType& op_ct)
+{
+	uint64_t val = getIntVal(row, fp, isNull, op_ct);
+	if (val > 0)
+		return string("1");
+	else if (val < 0)
+		return string("-1");
+	else
+		return string("0");
+}
+
+} // namespace funcexp
+// vim:ts=4 sw=4:
+