the begginning

utils/windowfunction/windowframe.cpp

@@ -0,0 +1,90 @@
+/* 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: windowframe.cpp 3821 2013-05-17 23:58:16Z xlou $
+
+
+//#define NDEBUG
+#include <cassert>
+#include <cmath>
+#include <sstream>
+#include <iomanip>
+using namespace std;
+
+#include <boost/scoped_ptr.hpp>
+#include <boost/shared_ptr.hpp>
+using namespace boost;
+
+#include "loggingid.h"
+#include "errorcodes.h"
+#include "idberrorinfo.h"
+using namespace logging;
+
+#include "rowgroup.h"
+using namespace rowgroup;
+
+#include "windowframe.h"
+
+
+namespace
+{
+string UnitStr[] = {"ROWS", "RANGE"};
+}
+
+
+namespace windowfunction
+{
+
+
+pair<uint64_t, uint64_t> WindowFrame::getWindow(int64_t b, int64_t e, int64_t c)
+{
+	int64_t upper = fUpper->getBound(b, e, c);
+	int64_t lower = fLower->getBound(b, e, c);
+
+	//     case 1       ||         case 2           ||        case 3
+	if ((upper > lower) || (upper < b && lower < b) || (upper > e && lower > e))
+	{
+		// construct an empty window
+		upper = b+1;
+		lower = b;
+	}
+
+	if (upper < b)  // case 2, lower >= b
+	{
+		upper = b;
+	}
+
+	if (lower > e)  // case 3, upper <= e
+	{
+		lower = e;
+	}
+
+	return make_pair(upper, lower);
+}
+
+
+const string WindowFrame::toString() const
+{
+	string ret(UnitStr[fUnit]);
+	ret = ret + " between " + fUpper->toString() + " and " + fLower->toString();
+
+	return ret;
+}
+
+}   //namespace
+// vim:ts=4 sw=4:
+