mariadb-columnstore-engine/utils/funcexp/func_ifnull.cpp

/* Copyright (C) 2014 InfiniDB, Inc.
   Copyright (C) 2019 MariaDB Corporation

   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_ifnull.cpp 3923 2013-06-19 21:43:06Z bwilkinson $
 *
 *
 ****************************************************************************/

#include <string>
using namespace std;

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

#include "rowgroup.h"
using namespace rowgroup;

namespace funcexp
{
// IFNULL(expression1, expression12)
//
// if parm order:
//   expression1 expression2
//
// If expression1 is not NULL, IFNULL() returns expression1;
// otherwise it returns expression2.
//

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

int64_t Func_ifnull::getIntVal(Row& row, FunctionParm& parm, bool& isNull, CalpontSystemCatalog::ColType&)
{
  if (isNull)
    return 0;

  int64_t r = parm[0]->data()->getIntVal(row, isNull);

  if (isNull)
  {
    isNull = false;
    r = parm[1]->data()->getIntVal(row, isNull);
    // MCOL-5237 In case we substitude a null value for `DATETIME` column with a value from `ConstantColumn`
    // we have to convert the value into the `DATETIME` format for `int64_t` type.
    if (parm[0]->data()->resultType().colDataType == CalpontSystemCatalog::DATETIME &&
        dynamic_cast<ConstantColumn*>(parm[1]->data()))
    {
      r = r << 48;
    }
  }

  return r;
}

string Func_ifnull::getStrVal(Row& row, FunctionParm& parm, bool& isNull, CalpontSystemCatalog::ColType&)
{
  const auto& r = parm[0]->data()->getStrVal(row, isNull);

  if (isNull)
  {
    isNull = false;
    return parm[1]->data()->getStrVal(row, isNull).safeString("");
  }

  return r.safeString("");
}

IDB_Decimal Func_ifnull::getDecimalVal(Row& row, FunctionParm& parm, bool& isNull,
                                       CalpontSystemCatalog::ColType&)
{
  if (isNull)
    return IDB_Decimal();

  IDB_Decimal r = parm[0]->data()->getDecimalVal(row, isNull);

  if (isNull)
  {
    isNull = false;
    return parm[1]->data()->getDecimalVal(row, isNull);
  }

  return r;
}

double Func_ifnull::getDoubleVal(Row& row, FunctionParm& parm, bool& isNull, CalpontSystemCatalog::ColType&)
{
  if (isNull)
    return 0.0;

  double r = parm[0]->data()->getDoubleVal(row, isNull);

  if (isNull)
  {
    isNull = false;
    return parm[1]->data()->getDoubleVal(row, isNull);
  }

  return r;
}

long double Func_ifnull::getLongDoubleVal(Row& row, FunctionParm& parm, bool& isNull,
                                          CalpontSystemCatalog::ColType&)
{
  if (isNull)
    return 0.0;

  long double r = parm[0]->data()->getLongDoubleVal(row, isNull);

  if (isNull)
  {
    isNull = false;
    return parm[1]->data()->getLongDoubleVal(row, isNull);
  }

  return r;
}

int32_t Func_ifnull::getDateIntVal(Row& row, FunctionParm& parm, bool& isNull, CalpontSystemCatalog::ColType&)
{
  if (isNull)
    return 0;

  int64_t r = parm[0]->data()->getDateIntVal(row, isNull);

  if (isNull)
  {
    isNull = false;
    return parm[1]->data()->getDateIntVal(row, isNull);
  }

  return r;
}

int64_t Func_ifnull::getDatetimeIntVal(Row& row, FunctionParm& parm, bool& isNull,
                                       CalpontSystemCatalog::ColType&)
{
  if (isNull)
    return 0;

  int64_t r = parm[0]->data()->getDatetimeIntVal(row, isNull);

  if (isNull)
  {
    isNull = false;
    return parm[1]->data()->getDatetimeIntVal(row, isNull);
  }

  return r;
}

int64_t Func_ifnull::getTimestampIntVal(Row& row, FunctionParm& parm, bool& isNull,
                                        CalpontSystemCatalog::ColType&)
{
  if (isNull)
    return 0;

  int64_t r = parm[0]->data()->getTimestampIntVal(row, isNull);

  if (isNull)
  {
    isNull = false;
    return parm[1]->data()->getTimestampIntVal(row, isNull);
  }

  return r;
}

int64_t Func_ifnull::getTimeIntVal(Row& row, FunctionParm& parm, bool& isNull, CalpontSystemCatalog::ColType&)
{
  if (isNull)
    return 0;

  int64_t r = parm[0]->data()->getTimeIntVal(row, isNull);

  if (isNull)
  {
    isNull = false;
    return parm[1]->data()->getTimeIntVal(row, isNull);
  }

  return r;
}

bool Func_ifnull::getBoolVal(Row& row, FunctionParm& parm, bool& isNull, CalpontSystemCatalog::ColType& ct)
{
  int64_t ret = getIntVal(row, parm, isNull, ct);
  return (ret == 0 ? false : true);
}

}  // namespace funcexp