mariadb-columnstore-engine/utils/funcexp/func_str_to_date.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_str_to_date.cpp 2578 2011-05-12 16:26:55Z chao $
*
*
****************************************************************************/

#include <unistd.h>
#include <cstdlib>
#include <string>
using namespace std;

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

#include "dataconvert.h"
#define MAX_DAY_NUMBER 3652424L

#include "timeextract.h"

namespace
{
using namespace funcexp;

dataconvert::DateTime getDateTime (rowgroup::Row& row,
                                   FunctionParm& parm,
                                   bool& isNull,
                                   CalpontSystemCatalog::ColType&)
{
    TimeExtractor extractor;
    dataconvert::DateTime dateTime;
    dateTime.year = 0;
    dateTime.month = 0;
    dateTime.day = 0;
    dateTime.hour = 0;
    dateTime.minute = 0;
    dateTime.second = 0;
    dateTime.msecond = 0;
    int64_t val = 0;
    string valStr;
    const string& formatStr = parm[1]->data()->getStrVal(row, isNull);
    int rc = 0;

    switch (parm[0]->data()->resultType().colDataType)
    {
        case CalpontSystemCatalog::DATE:
        {
            val = parm[0]->data()->getIntVal(row, isNull);
            valStr = dataconvert::DataConvert::dateToString (val);
            rc = extractor.extractTime (valStr, formatStr, dateTime);

            if ( rc < 0)
            {
                isNull = true;
                return -1;
            }

            break;
        }

        case CalpontSystemCatalog::DATETIME:
        {
            val = parm[0]->data()->getIntVal(row, isNull);
            valStr = dataconvert::DataConvert::datetimeToString (val);
            rc = extractor.extractTime (valStr, formatStr, dateTime);

            if ( rc < 0)
            {
                isNull = true;
                return -1;
            }

            break;
        }

        case CalpontSystemCatalog::CHAR:
        case CalpontSystemCatalog::TEXT:
        case CalpontSystemCatalog::VARCHAR:
        {
            const string& valref = parm[0]->data()->getStrVal(row, isNull);
            //decode with provided format
            rc = extractor.extractTime (valref, formatStr, dateTime);

            if ( rc < 0)
            {
                isNull = true;
                return -1;
            }

            break;
        }

        case CalpontSystemCatalog::BIGINT:
        case CalpontSystemCatalog::MEDINT:
        case CalpontSystemCatalog::SMALLINT:
        case CalpontSystemCatalog::TINYINT:
        case CalpontSystemCatalog::INT:
        {
            val = parm[0]->data()->getIntVal(row, isNull);
            //decode with provided format
            rc = extractor.extractTime (helpers::intToString(val), formatStr, dateTime);

            if ( rc < 0)
            {
                isNull = true;
                return -1;
            }

            break;
        }

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

                //decode with provided format
                rc = extractor.extractTime (helpers::intToString(val), formatStr, dateTime);

                if ( rc < 0)
                {
                    isNull = true;
                    return -1;
                }
            }

            break;
        }

        default:
            isNull = true;
            return -1;
    }

    return dateTime;
}

}

namespace funcexp
{

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

string Func_str_to_date::getStrVal(rowgroup::Row& row,
                                   FunctionParm& parm,
                                   bool& isNull,
                                   CalpontSystemCatalog::ColType& ct)
{
    dataconvert::DateTime dateTime;
    dateTime = getDateTime(row, parm, isNull, ct);
    string convertedDate = dataconvert::DataConvert::datetimeToString(*((long long*) &dateTime));
    return convertedDate;
}

int32_t Func_str_to_date::getDateIntVal(rowgroup::Row& row,
                                        FunctionParm& parm,
                                        bool& isNull,
                                        CalpontSystemCatalog::ColType& ct)
{
    dataconvert::DateTime dateTime;
    dateTime = getDateTime(row, parm, isNull, ct);
    int64_t time = *(reinterpret_cast<int64_t*>(&dateTime));
    return ((((int32_t)(time >> 32)) & 0xFFFFFFC0) | 0x3E);
}

int64_t Func_str_to_date::getDatetimeIntVal(rowgroup::Row& row,
        FunctionParm& parm,
        bool& isNull,
        CalpontSystemCatalog::ColType& ct)
{
    dataconvert::DateTime dateTime;
    dateTime = getDateTime(row, parm, isNull, ct);
    int64_t time = *(reinterpret_cast<int64_t*>(&dateTime));
    return time;
}

int64_t Func_str_to_date::getIntVal(rowgroup::Row& row,
                                    FunctionParm& parm,
                                    bool& isNull,
                                    CalpontSystemCatalog::ColType& ct)
{
    dataconvert::DateTime dateTime;
    dateTime = getDateTime(row, parm, isNull, ct);
    int64_t time = *(reinterpret_cast<int64_t*>(&dateTime));
    return time;
}


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