the begginning

utils/windowfunction/wf_min_max.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: wf_min_max.cpp 3932 2013-06-25 16:08:10Z xlou $
+
+
+//#define NDEBUG
+#include <cassert>
+#include <cmath>
+#include <sstream>
+#include <iomanip>
+using namespace std;
+
+#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 "joblisttypes.h"
+#include "calpontsystemcatalog.h"
+using namespace execplan;
+
+#include "windowfunctionstep.h"
+using namespace joblist;
+
+#include "wf_min_max.h"
+
+
+namespace windowfunction
+{
+
+
+template<typename T>
+boost::shared_ptr<WindowFunctionType> WF_min_max<T>::makeFunction(int id, const string& name, int ct)
+{
+	boost::shared_ptr<WindowFunctionType> func;
+	switch (ct)
+	{
+		case CalpontSystemCatalog::TINYINT:
+		case CalpontSystemCatalog::SMALLINT:
+		case CalpontSystemCatalog::MEDINT:
+		case CalpontSystemCatalog::INT:
+		case CalpontSystemCatalog::BIGINT:
+		case CalpontSystemCatalog::DECIMAL:
+		{
+			func.reset(new WF_min_max<int64_t>(id, name));
+			break;
+		}
+		case CalpontSystemCatalog::UTINYINT:
+		case CalpontSystemCatalog::USMALLINT:
+		case CalpontSystemCatalog::UMEDINT:
+		case CalpontSystemCatalog::UINT:
+		case CalpontSystemCatalog::UBIGINT:
+		case CalpontSystemCatalog::UDECIMAL:
+		case CalpontSystemCatalog::DATE:
+		case CalpontSystemCatalog::DATETIME:
+		{
+			func.reset(new WF_min_max<uint64_t>(id, name));
+			break;
+		}
+		case CalpontSystemCatalog::DOUBLE:
+		case CalpontSystemCatalog::UDOUBLE:
+		{
+			func.reset(new WF_min_max<double>(id, name));
+			break;
+		}
+		case CalpontSystemCatalog::FLOAT:
+		case CalpontSystemCatalog::UFLOAT:
+		{
+			func.reset(new WF_min_max<float>(id, name));
+			break;
+		}
+		default:
+		{
+			func.reset(new WF_min_max<string>(id, name));
+			break;
+		}
+	}
+
+	return func;
+}
+
+
+template<typename T>
+WindowFunctionType* WF_min_max<T>::clone() const
+{
+	return new WF_min_max<T>(*this);
+}
+
+
+template<typename T>
+void WF_min_max<T>::resetData()
+{
+	fCount = 0;
+
+	WindowFunctionType::resetData();
+}
+
+
+template<typename T>
+void WF_min_max<T>::operator()(int64_t b, int64_t e, int64_t c)
+{
+	// for unbounded - current row special handling
+	if (fPrev >= b && fPrev < c)
+		b = c;
+	else if (fPrev <= e && fPrev > c)
+		e = c;
+
+	uint64_t colIn = fFieldIndex[1];
+	for (int64_t i = b; i <= e; i++)
+	{
+		if (i % 1000 == 0 && fStep->cancelled())
+			break;
+
+		fRow.setData(getPointer(fRowData->at(i)));
+		if (fRow.isNullValue(colIn) == true)
+			continue;
+
+		T valIn;
+		getValue(colIn, valIn);
+		if ((fCount == 0) ||
+			(valIn < fValue && fFunctionId == WF__MIN) ||
+			(valIn > fValue && fFunctionId == WF__MAX))
+		{
+			fValue = valIn;
+		}
+
+		fCount++;
+	}
+
+	T* v = ((fCount > 0) ? &fValue : NULL);
+	setValue(fRow.getColType(fFieldIndex[0]), b, e, c, v);
+
+	fPrev = c;
+}
+
+
+template
+boost::shared_ptr<WindowFunctionType> WF_min_max<int64_t>::makeFunction(int, const string&, int);
+
+
+}   //namespace
+// vim:ts=4 sw=4:
+