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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems, 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include <drizzled/function/additive_op.h>
#include <drizzled/type/decimal.h>
#include <algorithm>
using namespace std;
namespace drizzled
{
/**
Set precision of results for additive operations (+ and -)
*/
void Item_func_additive_op::result_precision()
{
decimals= max(args[0]->decimals, args[1]->decimals);
int max_int_part= max(args[0]->decimal_precision() - args[0]->decimals,
args[1]->decimal_precision() - args[1]->decimals);
int precision= min(max_int_part + 1 + decimals, DECIMAL_MAX_PRECISION);
/* Integer operations keep unsigned_flag if one of arguments is unsigned */
if (result_type() == INT_RESULT)
unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;
else
unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag;
max_length= class_decimal_precision_to_length(precision, decimals,
unsigned_flag);
}
} /* namespace drizzled */
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