Commit 09976a27 authored by unknown's avatar unknown
Browse files

Merge mysql.com.:/data/BK/mysql-5.0 

into  mysql.com.:/data/BK/mysql-5.0_8461_b
parents 96268d4a c9bb7e1f

mysql-test/r/func_math.result

+15 −0
Original line number Diff line number Diff line
@@ -203,3 +203,18 @@ NULL 
Warnings:

Error	1365	Division by 0

set sql_mode='';

select round(111,-10);

round(111,-10)

0

select round(-5000111000111000155,-1);

round(-5000111000111000155,-1)

-5000111000111000160

select round(15000111000111000155,-1);

round(15000111000111000155,-1)

15000111000111000160

select truncate(-5000111000111000155,-1);

truncate(-5000111000111000155,-1)

-5000111000111000150

select truncate(15000111000111000155,-1);

truncate(15000111000111000155,-1)

15000111000111000150

mysql-test/t/func_math.test

+14 −0
Original line number Diff line number Diff line
@@ -141,3 +141,17 @@ select log(2,-1); 
select log(-2,1);

set sql_mode='';



#

# Bug #8461 truncate() and round() return false results 2nd argument negative.

# 

# round(a,-b) log_10(b) > a

select round(111,-10);

# round on bigint 

select round(-5000111000111000155,-1);

# round on unsigned bigint

select round(15000111000111000155,-1);

# truncate on bigint 

select truncate(-5000111000111000155,-1);

# truncate on unsigned bigint

select truncate(15000111000111000155,-1);

sql/item_func.cc

+18 −16
Original line number Diff line number Diff line
@@ -1863,28 +1863,30 @@ longlong Item_func_round::int_op() 
    return value; // integer have not digits after point



  abs_dec= -dec;

  double tmp;

  /*

    tmp2 is here to avoid return the value with 80 bit precision

    This will fix that the test round(0.1,1) = round(0.1,1) is true

  */

  volatile double tmp2;

  longlong tmp;

  

  tmp= (abs_dec < array_elements(log_10) ?

        log_10[abs_dec] : pow(10.0, (double) abs_dec));

  if(abs_dec >= array_elements(log_10_int))

    return 0;

  

  tmp= log_10_int[abs_dec];

  

  if (truncate)

  {

    if (unsigned_flag)

      tmp2= floor(ulonglong2double(value)/tmp)*tmp;

    else if (value >= 0)

      tmp2= floor(((double)value)/tmp)*tmp;

      value= (ulonglong(value)/tmp)*tmp;

    else

      tmp2= ceil(((double)value)/tmp)*tmp;

      value= (value/tmp)*tmp;

  }

  else

    tmp2= rint(((double)value)/tmp)*tmp;

  return (longlong)tmp2;

  {

    if (unsigned_flag)

      value= ((ulonglong(value)+(tmp>>1))/tmp)*tmp;

    else if ( value >= 0)

      value= ((value+(tmp>>1))/tmp)*tmp;

    else

      value= ((value-(tmp>>1))/tmp)*tmp;

  }

  return value;

}