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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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* Copyright (C) 2008 Sun Microsystems
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#include <drizzled/server_includes.h>
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#include <drizzled/function/math/divide.h>
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#include <drizzled/session.h>
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double Item_func_div::real_op()
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double value= args[0]->val_real();
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double val2= args[1]->val_real();
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if ((null_value= args[0]->null_value || args[1]->null_value))
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signal_divide_by_null();
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return fix_result(value/val2);
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my_decimal *Item_func_div::decimal_op(my_decimal *decimal_value)
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my_decimal value1, *val1;
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my_decimal value2, *val2;
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val1= args[0]->val_decimal(&value1);
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if ((null_value= args[0]->null_value))
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val2= args[1]->val_decimal(&value2);
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if ((null_value= args[1]->null_value))
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if ((err= my_decimal_div(E_DEC_FATAL_ERROR & ~E_DEC_DIV_ZERO, decimal_value,
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val1, val2, prec_increment)) > 3)
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if (err == E_DEC_DIV_ZERO)
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signal_divide_by_null();
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void Item_func_div::result_precision()
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uint32_t precision= min(args[0]->decimal_precision() + prec_increment,
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(unsigned int)DECIMAL_MAX_PRECISION);
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/* Integer operations keep unsigned_flag if one of arguments is unsigned */
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if (result_type() == INT_RESULT)
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unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;
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unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag;
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decimals= min(args[0]->decimals + prec_increment, (unsigned int)DECIMAL_MAX_SCALE);
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max_length= my_decimal_precision_to_length(precision, decimals,
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void Item_func_div::fix_length_and_dec()
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prec_increment= current_session->variables.div_precincrement;
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Item_num_op::fix_length_and_dec();
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decimals= max(args[0]->decimals,args[1]->decimals)+prec_increment;
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set_if_smaller(decimals, NOT_FIXED_DEC);
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max_length= args[0]->max_length - args[0]->decimals + decimals;
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uint32_t tmp= float_length(decimals);
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set_if_smaller(max_length,tmp);
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hybrid_type= DECIMAL_RESULT;
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maybe_null= 1; // devision by zero