mariadb-columnstore-engine/utils/funcexp/func_last_day.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: func_last_day.cpp 2477 2011-05-11 16:07:35Z chao $
*
*
****************************************************************************/

#include <cstdlib>
#include <string>
#include <sstream>
using namespace std;

#include "functor_int.h"
#include "funchelpers.h"
#include "functioncolumn.h"
#include "rowgroup.h"
using namespace execplan;

#include "dataconvert.h"
using namespace dataconvert;

namespace funcexp
{

CalpontSystemCatalog::ColType Func_last_day::operationType( FunctionParm& fp, CalpontSystemCatalog::ColType& resultType )
{
    return resultType;
}


int64_t Func_last_day::getIntVal(rowgroup::Row& row,
                                 FunctionParm& parm,
                                 bool& isNull,
                                 CalpontSystemCatalog::ColType& op_ct)
{
    uint32_t year = 0;
    uint32_t month = 0;
    uint32_t day = 0;
    int64_t val = 0;

    switch (parm[0]->data()->resultType().colDataType)
    {
        case CalpontSystemCatalog::DATE:
            val = parm[0]->data()->getIntVal(row, isNull);
            year = (uint32_t)((val >> 16) & 0xffff);
            month = (uint32_t)((val >> 12) & 0xf);
            day = (uint32_t)((val >> 6) & 0x3f);
            break;

        case CalpontSystemCatalog::DATETIME:
            val = parm[0]->data()->getIntVal(row, isNull);
            year = (uint32_t)((val >> 48) & 0xffff);
            month = (uint32_t)((val >> 44) & 0xf);
            day = (uint32_t)((val >> 38) & 0x3f);
            break;

        case CalpontSystemCatalog::CHAR:
        case CalpontSystemCatalog::TEXT:
        case CalpontSystemCatalog::VARCHAR:
            val = dataconvert::DataConvert::stringToDatetime(parm[0]->data()->getStrVal(row, isNull));

            if (val == -1)
            {
                isNull = true;
                return -1;
            }
            else
            {
                year = (uint32_t)((val >> 48) & 0xffff);
                month = (uint32_t)((val >> 44) & 0xf);
                day = (uint32_t)((val >> 38) & 0x3f);
            }

            break;

        case CalpontSystemCatalog::BIGINT:
        case CalpontSystemCatalog::MEDINT:
        case CalpontSystemCatalog::SMALLINT:
        case CalpontSystemCatalog::TINYINT:
        case CalpontSystemCatalog::INT:
            val = dataconvert::DataConvert::intToDatetime(parm[0]->data()->getIntVal(row, isNull));

            if (val == -1)
            {
                isNull = true;
                return -1;
            }
            else
            {
                year = (uint32_t)((val >> 48) & 0xffff);
                month = (uint32_t)((val >> 44) & 0xf);
                day = (uint32_t)((val >> 38) & 0x3f);
            }

            break;

        case CalpontSystemCatalog::DECIMAL:
            if (parm[0]->data()->resultType().scale == 0)
            {
                val = dataconvert::DataConvert::intToDatetime(parm[0]->data()->getIntVal(row, isNull));

                if (val == -1)
                {
                    isNull = true;
                    return -1;
                }
                else
                {
                    year = (uint32_t)((val >> 48) & 0xffff);
                    month = (uint32_t)((val >> 44) & 0xf);
                    day = (uint32_t)((val >> 38) & 0x3f);
                }
            }

            break;

        default:
            isNull = true;
            return -1;
    }

    uint32_t lastday = day;

    if (isLeapYear(year) && (month == 2))
    {
        lastday = 29;
    }
    else if ( month == 2)
    {
        lastday = 28;
    }
    else
    {
        lastday = daysInMonth[month - 1];
    }

    if (day > lastday)
    {
        isNull = true;
        return -1;
    }

    dataconvert::DateTime aDay;
    aDay.year = year;
    aDay.month = month;
    aDay.day = lastday;
    aDay.hour = 0;
    aDay.minute = 0;
    aDay.second = 0;
    aDay.msecond = 0;
    val = *(reinterpret_cast<uint64_t*>(&aDay));
    return val;
}


} // namespace funcexp
// vim:ts=4 sw=4: