mariadb-columnstore-engine/utils/funcexp/func_pow.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_pow.cpp 3495 2013-01-21 14:09:51Z rdempsey $
 *
 *
 ****************************************************************************/

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

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

#include "rowgroup.h"
using namespace rowgroup;

#include "errorcodes.h"
#include "idberrorinfo.h"
#include "errorids.h"
using namespace logging;

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

double Func_pow::getDoubleVal(Row& row, FunctionParm& parm, bool& isNull, CalpontSystemCatalog::ColType&)
{
  // null value is indicated by isNull
  double base = parm[0]->data()->getDoubleVal(row, isNull);

  if (!isNull)
  {
    double exponent = parm[1]->data()->getDoubleVal(row, isNull);

    if (!isNull)
    {
      errno = 0;
      double x = pow(base, exponent);

      // @bug3490, 4461, rule out domain error, pole error and overflow range error.
      if (!isfinite(x))
      {
        isNull = true;
        Message::Args args;
        args.add("pow");
        args.add(base);
        args.add(exponent);
        unsigned errcode = ERR_FUNC_OUT_OF_RANGE_RESULT;
        throw IDBExcept(IDBErrorInfo::instance()->errorMsg(errcode, args), errcode);
      }

      return x;
    }
  }

  return 0.0;
}

long double Func_pow::getLongDoubleVal(Row& row, FunctionParm& parm, bool& isNull,
                                       CalpontSystemCatalog::ColType&)
{
  // null value is indicated by isNull
  long double base = parm[0]->data()->getLongDoubleVal(row, isNull);

  if (!isNull)
  {
    // Should this be long double? Not sure on usage.
    double exponent = parm[1]->data()->getDoubleVal(row, isNull);

    if (!isNull)
    {
      errno = 0;
      long double x = powl(base, (long double)exponent);

      // @bug3490, 4461, rule out domain error, pole error and overflow range error.
      if (!isfinite(x))
      {
        isNull = true;
        Message::Args args;
        args.add("pow");
        args.add((double)base);
        args.add(exponent);
        unsigned errcode = ERR_FUNC_OUT_OF_RANGE_RESULT;
        throw IDBExcept(IDBErrorInfo::instance()->errorMsg(errcode, args), errcode);
      }

      return x;
    }
  }

  return 0.0;
}

}  // namespace funcexp