the begginning

utils/funcexp/func_pow.cpp

@@ -0,0 +1,79 @@
+/* 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_pow.cpp 3495 2013-01-21 14:09:51Z rdempsey $
+*
+*
+****************************************************************************/
+
+#include <cstdlib>
+#include <string>
+#include <cmath>
+#if defined(_MSC_VER) && !defined(isfinite)
+#include <float.h>
+#define isfinite _finite
+#endif
+using namespace std;
+
+#include "functor_real.h"
+#include "functioncolumn.h"
+using namespace execplan;
+
+#include "rowgroup.h"
+using namespace rowgroup;
+
+namespace funcexp
+{
+
+CalpontSystemCatalog::ColType Func_pow::operationType(FunctionParm& fp, CalpontSystemCatalog::ColType& resultType)
+{
+	// operation type is not used by this functor
+	return fp[0]->data()->resultType();
+}
+
+
+double Func_pow::getDoubleVal(Row& row,
+							FunctionParm& parm,
+							bool& isNull,
+							CalpontSystemCatalog::ColType&)
+{
+	// null value is indicated by isNull
+	double base = parm[0]->data()->getDoubleVal(row, isNull);
+	if (!isNull)
+	{
+		double exponent = parm[1]->data()->getDoubleVal(row, isNull); 
+
+		if (!isNull)
+		{
+			errno = 0;
+			double x = pow(base, exponent);
+
+			// @bug3490, 4461, rule out domain error, pole error and overflow range error.
+			if (!isfinite(x))
+				isNull = true;
+
+			return x;
+		}
+	}
+
+	return 0.0;
+}
+
+
+} // namespace funcexp
+// vim:ts=4 sw=4: