mirror of
https://github.com/MariaDB/server.git
synced 2025-01-19 21:42:35 +01:00
eb415e4920
Depending on the queries we use different data processing methods and can lose some data in case of double (and decimal in 4.1) fields. The fix consists of two parts: 1. double comparison changed, now double a is equal to double b if (a-b) is less than 5*0.1^(1 + max(a->decimals, b->decimals)). For example, if a->decimals==1, b->decimals==2, a==b if (a-b)<0.005 2. if we use a temporary table, store double values there as is to avoid any data conversion (rounding).
56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
|
|
|
|
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; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
|
|
|
|
|
|
/* Init and dummy functions for interface with unireg */
|
|
|
|
#include "mysql_priv.h"
|
|
#include <m_ctype.h>
|
|
|
|
void unireg_init(ulong options)
|
|
{
|
|
uint i;
|
|
double nr;
|
|
DBUG_ENTER("unireg_init");
|
|
|
|
MYSYS_PROGRAM_DONT_USE_CURSES();
|
|
abort_loop=0;
|
|
|
|
my_disable_async_io=1; /* aioread is only in shared library */
|
|
wild_many='%'; wild_one='_'; wild_prefix='\\'; /* Change to sql syntax */
|
|
|
|
current_pid=(ulong) getpid(); /* Save for later ref */
|
|
init_time(); /* Init time-functions (read zone) */
|
|
#ifndef EMBEDDED_LIBRARY
|
|
my_abort_hook=unireg_abort; /* Abort with close of databases */
|
|
#endif
|
|
|
|
VOID(strmov(reg_ext,".frm"));
|
|
specialflag=SPECIAL_SAME_DB_NAME;
|
|
/* Make a tab of powers of 10 */
|
|
for (i=0,nr=1.0; i < array_elements(log_10) ; i++)
|
|
{ /* It's used by filesort... */
|
|
log_10[i]= nr ; nr*= 10.0;
|
|
}
|
|
/* Make a tab of powers of 0.1 */
|
|
for (i= 0, nr= 0.1; i < array_elements(log_01); i++)
|
|
{
|
|
log_01[i]= nr;
|
|
nr*= 0.1;
|
|
}
|
|
specialflag|=options; /* Set options from argv */
|
|
DBUG_VOID_RETURN;
|
|
}
|