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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
*
* 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 <drizzled/server_includes.h>
#include CSTDINT_H
#include <drizzled/functions/multiply.h>
double Item_func_mul::real_op()
{
assert(fixed == 1);
double value= args[0]->val_real() * args[1]->val_real();
if ((null_value=args[0]->null_value || args[1]->null_value))
return 0.0;
return fix_result(value);
}
int64_t Item_func_mul::int_op()
{
assert(fixed == 1);
int64_t value=args[0]->val_int()*args[1]->val_int();
if ((null_value=args[0]->null_value || args[1]->null_value))
return 0;
return value;
}
/** See Item_func_plus::decimal_op for comments. */
my_decimal *Item_func_mul::decimal_op(my_decimal *decimal_value)
{
my_decimal value1, *val1;
my_decimal value2, *val2;
val1= args[0]->val_decimal(&value1);
if ((null_value= args[0]->null_value))
return 0;
val2= args[1]->val_decimal(&value2);
if (!(null_value= (args[1]->null_value ||
(my_decimal_mul(E_DEC_FATAL_ERROR, decimal_value, val1,
val2) > 3))))
return decimal_value;
return 0;
}
void Item_func_mul::result_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;
decimals= cmin(args[0]->decimals + args[1]->decimals, DECIMAL_MAX_SCALE);
int precision= cmin(args[0]->decimal_precision() + args[1]->decimal_precision(),
(unsigned int)DECIMAL_MAX_PRECISION);
max_length= my_decimal_precision_to_length(precision, decimals,unsigned_flag);
}
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