mariadb-columnstore-engine/utils/windowfunction/wf_min_max.cpp

/* 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: