the begginning

utils/funcexp/functor_export.h

@@ -0,0 +1,71 @@
+/* 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: functor_export.h 3495 2013-01-21 14:09:51Z rdempsey $
+
+/** @file */
+
+#ifndef FUNCTOR_EXPORT_H
+#define FUNCTOR_EXPORT_H
+
+
+#include "functor.h"
+
+
+namespace funcexp
+{
+
+/** @brief Func_rand class
+  *    This function is exported, so visible to FunctionColumn in dbcon.
+  */
+class Func_rand : public Func
+{
+public:
+	Func_rand() : Func("rand"), fSeed1(0), fSeed2(0), fSeedSet(false){}
+	virtual ~Func_rand() {}
+
+	double getRand();
+	void seedSet(bool seedSet) { fSeedSet = seedSet; }
+	execplan::CalpontSystemCatalog::ColType operationType(FunctionParm& fp, execplan::CalpontSystemCatalog::ColType& resultType);
+
+	int64_t getIntVal(rowgroup::Row& row,
+						FunctionParm& fp,
+						bool& isNull,
+						execplan::CalpontSystemCatalog::ColType& op_ct)
+	{ return ((int64_t) getDoubleVal(row, fp, isNull, op_ct)); }
+
+	double getDoubleVal(rowgroup::Row& row,
+						FunctionParm& fp,
+						bool& isNull,
+						execplan::CalpontSystemCatalog::ColType& op_ct);
+
+	std::string getStrVal(rowgroup::Row& row,
+						FunctionParm& fp,
+						bool& isNull,
+						execplan::CalpontSystemCatalog::ColType& op_ct)
+	{ return doubleToString(getDoubleVal(row, fp, isNull, op_ct)); }
+
+private:
+	uint64_t fSeed1;
+	uint64_t fSeed2;
+	bool     fSeedSet;
+};
+
+
+}
+
+#endif