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126 lines
3.2 KiB
C++
126 lines
3.2 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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// $Id: windowfunction.h 3932 2013-06-25 16:08:10Z xlou $
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#ifndef UTILS_WINDOWFUNCTION_H
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#define UTILS_WINDOWFUNCTION_H
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#include <vector>
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#include <utility>
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#include <boost/shared_ptr.hpp>
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#include <boost/thread.hpp>
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#include "rowgroup.h"
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#include "windowfunctionstep.h"
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namespace ordering
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{
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// forward reference
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class EqualCompData;
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class OrderByData;
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};
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namespace windowfunction
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{
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// forward reference
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class WindowFunctionType;
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class WindowFrame;
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/** @brief class WindowFunction
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*
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*/
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class WindowFunction
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{
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public:
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/** @brief WindowFunction constructor
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* @param f: shared pointer to a WindowFuncitonType
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* @param p: shared pointer to equal compare functor
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* @param o: shared pointer to order by functor
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* @param w: shared pointer to window specification
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* @param r: row meta data
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*/
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WindowFunction(boost::shared_ptr<WindowFunctionType>& f,
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boost::shared_ptr<ordering::EqualCompData>& p,
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boost::shared_ptr<ordering::OrderByData>& o,
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boost::shared_ptr<WindowFrame>& w,
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const rowgroup::RowGroup& g,
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const rowgroup::Row& r);
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/** @brief WindowFunction destructor
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*/
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virtual ~WindowFunction();
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/** @brief virtual void Run method
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*/
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void operator()();
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const std::string toString() const;
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void setCallback(joblist::WindowFunctionStep*, int);
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const rowgroup::Row& getRow() const;
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protected:
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// cancellable sort function
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void sort(std::vector<joblist::RowPosition>::iterator, uint64_t);
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// special window frames
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void processUnboundedWindowFrame1();
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void processUnboundedWindowFrame2();
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void processUnboundedWindowFrame3();
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void processExprWindowFrame();
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// for string table
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rowgroup::Row::Pointer getPointer(joblist::RowPosition& r)
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{ return fStep->getPointer(r, fRowGroup, fRow); }
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// function type
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boost::shared_ptr<WindowFunctionType> fFunctionType;
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// window clause
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boost::shared_ptr<ordering::EqualCompData> fPartitionBy;
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boost::shared_ptr<ordering::OrderByData> fOrderBy;
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boost::shared_ptr<WindowFrame> fFrame;
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std::vector<std::pair<int64_t, int64_t> > fPartition;
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// data
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boost::shared_ptr<std::vector<joblist::RowPosition> > fRowData;
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// row meta data
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rowgroup::RowGroup fRowGroup;
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rowgroup::Row fRow;
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// pointer back to step
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joblist::WindowFunctionStep* fStep;
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int fId;
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friend class joblist::WindowFunctionStep;
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};
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} // namespace
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#endif // UTILS_WINDOWFUNCTION_H
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// vim:ts=4 sw=4:
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