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92 lines
1.9 KiB
C++
92 lines
1.9 KiB
C++
/*
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Copyright (c) 2017, MariaDB
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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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*/
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//#define NDEBUG
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#include <cassert>
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#include <cmath>
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#include <sstream>
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#include <iomanip>
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using namespace std;
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#include <boost/scoped_ptr.hpp>
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#include <boost/shared_ptr.hpp>
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using namespace boost;
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#include "loggingid.h"
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#include "errorcodes.h"
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#include "idberrorinfo.h"
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using namespace logging;
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#include "rowgroup.h"
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using namespace rowgroup;
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#include "windowframe.h"
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namespace
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{
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string UnitStr[] = {"ROWS", "RANGE"};
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}
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namespace windowfunction
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{
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pair<uint64_t, uint64_t> WindowFrame::getWindow(int64_t b, int64_t e, int64_t c)
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{
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int64_t upper = fUpper->getBound(b, e, c);
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int64_t lower = fLower->getBound(b, e, c);
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// case 1 || case 2 || case 3
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if ((upper > lower) || (upper < b && lower < b) || (upper > e && lower > e))
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{
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// construct an empty window
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upper = b+1;
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lower = b;
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}
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if (upper < b) // case 2, lower >= b
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{
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upper = b;
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}
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if (lower > e) // case 3, upper <= e
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{
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lower = e;
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}
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return make_pair(upper, lower);
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}
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const string WindowFrame::toString() const
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{
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string ret(UnitStr[fUnit]);
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ret = ret + " between " + fUpper->toString() + " and " + fLower->toString();
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return ret;
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}
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} //namespace
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// vim:ts=4 sw=4:
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