mariadb-columnstore-engine/utils/funcexp/func_greatest.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_greatest.cpp 3954 2013-07-08 16:30:15Z bpaul $
*
*
****************************************************************************/

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

#include "functor_all.h"
#include "functioncolumn.h"
using namespace execplan;

#include "rowgroup.h"
using namespace rowgroup;

#include "joblisttypes.h"
using namespace joblist;

#include "utils_utf8.h"
using namespace funcexp;


class to_lower
{
public:
    char operator() (char c) const            // notice the return type
    {
        return tolower(c);
    }
};


namespace funcexp
{

CalpontSystemCatalog::ColType Func_greatest::operationType(FunctionParm& fp, CalpontSystemCatalog::ColType& resultType)
{
    // operation type is not used by this functor
    //return fp[0]->data()->resultType();
    return resultType;
}

int64_t Func_greatest::getIntVal(rowgroup::Row& row,
                                 FunctionParm& fp,
                                 bool& isNull,
                                 execplan::CalpontSystemCatalog::ColType& op_ct)
{
    double str = fp[0]->data()->getDoubleVal(row, isNull);

    double greatestStr = str;

    for (uint32_t i = 1; i < fp.size(); i++)
    {
        double str1 = fp[i]->data()->getDoubleVal(row, isNull);

        if ( greatestStr < str1 )
            greatestStr = str1;
    }

    uint64_t tmp = (uint64_t)greatestStr;
    return (int64_t) tmp;
}

uint64_t Func_greatest::getUintVal(rowgroup::Row& row,
                                   FunctionParm& fp,
                                   bool& isNull,
                                   execplan::CalpontSystemCatalog::ColType& op_ct)
{
    double str = fp[0]->data()->getDoubleVal(row, isNull);

    double greatestStr = str;

    for (uint32_t i = 1; i < fp.size(); i++)
    {
        double str1 = fp[i]->data()->getDoubleVal(row, isNull);

        if ( greatestStr < str1 )
            greatestStr = str1;
    }

    return (uint64_t) greatestStr;
}

double Func_greatest::getDoubleVal(rowgroup::Row& row,
                                   FunctionParm& fp,
                                   bool& isNull,
                                   execplan::CalpontSystemCatalog::ColType& op_ct)
{
    double str = fp[0]->data()->getDoubleVal(row, isNull);

    double greatestStr = str;

    for (uint32_t i = 1; i < fp.size(); i++)
    {
        double str1 = fp[i]->data()->getDoubleVal(row, isNull);

        if ( greatestStr < str1 )
            greatestStr = str1;
    }

    return (double) greatestStr;
}

std::string Func_greatest::getStrVal(rowgroup::Row& row,
                                     FunctionParm& fp,
                                     bool& isNull,
                                     execplan::CalpontSystemCatalog::ColType& op_ct)
{
    const string& str = fp[0]->data()->getStrVal(row, isNull);

    string greatestStr = str;

    for (uint32_t i = 1; i < fp.size(); i++)
    {
        const string& str1 = fp[i]->data()->getStrVal(row, isNull);

        int tmp = utf8::idb_strcoll(greatestStr.c_str(), str1.c_str());

        if ( tmp < 0 )

//		if ( greatestStr < str1 )
            greatestStr = str1;
    }

    return greatestStr;
}

IDB_Decimal Func_greatest::getDecimalVal(Row& row,
        FunctionParm& fp,
        bool& isNull,
        CalpontSystemCatalog::ColType& ct)
{
//	double str = fp[0]->data()->getDoubleVal(row, isNull);
    IDB_Decimal str = fp[0]->data()->getDecimalVal(row, isNull);

    IDB_Decimal greatestStr = str;

    for (uint32_t i = 1; i < fp.size(); i++)
    {
        IDB_Decimal str1 = fp[i]->data()->getDecimalVal(row, isNull);

        if ( greatestStr < str1 )
            greatestStr = str1;
    }

    return greatestStr;
}

int32_t Func_greatest::getDateIntVal(rowgroup::Row& row,
                                     FunctionParm& fp,
                                     bool& isNull,
                                     execplan::CalpontSystemCatalog::ColType& ct)
{
    int32_t str = fp[0]->data()->getDateIntVal(row, isNull);

    int32_t greatestStr = str;

    for (uint32_t i = 1; i < fp.size(); i++)
    {
        int32_t str1 = fp[i]->data()->getDateIntVal(row, isNull);

        if ( greatestStr < str1 )
            greatestStr = str1;
    }

    return greatestStr;
}

int64_t Func_greatest::getDatetimeIntVal(rowgroup::Row& row,
        FunctionParm& fp,
        bool& isNull,
        execplan::CalpontSystemCatalog::ColType& ct)
{
    int64_t str = fp[0]->data()->getDatetimeIntVal(row, isNull);

    int64_t greatestStr = str;

    for (uint32_t i = 1; i < fp.size(); i++)
    {
        int64_t str1 = fp[i]->data()->getDatetimeIntVal(row, isNull);

        if ( greatestStr < str1 )
            greatestStr = str1;
    }

    return greatestStr;
}

int64_t Func_greatest::getTimeIntVal(rowgroup::Row& row,
        FunctionParm& fp,
        bool& isNull,
        execplan::CalpontSystemCatalog::ColType& ct)
{
    // Strip off unused day
    int64_t greatestStr = fp[0]->data()->getTimeIntVal(row, isNull);

    int64_t str = greatestStr << 12;

    for (uint32_t i = 1; i < fp.size(); i++)
    {
        int64_t str1 = fp[i]->data()->getTimeIntVal(row, isNull);
        int64_t str2 = str1 << 12;

        if ( str < str2 )
        {
            greatestStr = str1;
            str = str2;
        }
    }

    return greatestStr;
}

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