mirror of
https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
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158 lines
3.7 KiB
C++
158 lines
3.7 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: wf_ranking.cpp 3932 2013-06-25 16:08:10Z xlou $
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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/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 "idborderby.h"
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using namespace ordering;
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#include "joblisttypes.h"
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#include "calpontsystemcatalog.h"
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using namespace execplan;
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#include "windowfunctionstep.h"
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using namespace joblist;
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#include "wf_ranking.h"
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namespace windowfunction
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{
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boost::shared_ptr<WindowFunctionType> WF_ranking::makeFunction(int id, const string& name, int ct)
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{
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boost::shared_ptr<WindowFunctionType> func(new WF_ranking(id, name));
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return func;
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}
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WindowFunctionType* WF_ranking::clone() const
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{
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return new WF_ranking(*this);
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}
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void WF_ranking::resetData()
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{
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fRank = 0;
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fDups = 0;
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WindowFunctionType::resetData();
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}
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void WF_ranking::operator()(int64_t b, int64_t e, int64_t c)
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{
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// one row handling
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if (fPartition.first == fPartition.second)
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{
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fRow.setData(getPointer(fRowData->at(fPartition.first)));
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int64_t r = (fFunctionId == WF__PERCENT_RANK) ? 0 : 1;
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if (fFunctionId == WF__RANK || fFunctionId == WF__DENSE_RANK)
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setIntValue(fFieldIndex[0], r);
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else
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setDoubleValue(fFieldIndex[0], r);
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return;
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}
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// more than one row, e > b
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b = fPartition.first;
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e = fPartition.second;
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double n1 = e - b; // count(*) - 1, n will not be 0.
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for (c = b; c <= e; c++)
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{
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if (c % 1000 == 0 && fStep->cancelled())
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break;
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if (c != b &&
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fPeer->operator()(getPointer(fRowData->at(c)), getPointer(fRowData->at(c - 1))))
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{
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fDups++;
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}
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else
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{
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fRank++;
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if (fFunctionId != WF__DENSE_RANK)
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fRank += fDups;
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fDups = 0;
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}
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fRow.setData(getPointer(fRowData->at(c)));
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if (fFunctionId != WF__PERCENT_RANK)
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setIntValue(fFieldIndex[0], fRank);
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else
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setDoubleValue(fFieldIndex[0], (fRank - 1) / n1);
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}
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// Two-pass, need to find peers.
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if (fFunctionId == WF__CUME_DIST)
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{
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int prevRank = ++fRank + fDups; // hypothetical row at (e+1)
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double n0 = (e - b + 1); // count(*)
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double cumeDist = 1;
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fRow.setData(getPointer(fRowData->at(e)));
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for (c = e; c >= b; c--)
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{
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if (c % 1000 == 0 && fStep->cancelled())
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break;
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fRow.setData(getPointer(fRowData->at(c)));
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int currRank = getIntValue(fFieldIndex[0]);
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if (currRank != prevRank)
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{
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cumeDist = ((double) (prevRank - 1)) / n0;
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prevRank = currRank;
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}
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setDoubleValue(fFieldIndex[0], cumeDist);
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}
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}
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}
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} //namespace
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// vim:ts=4 sw=4:
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