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BUG#15101 SYSDATE() disregards SET TIMESTAMP.

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After the ChangeSet 1.1892.20.1 2005/08/24 (Bug #12562) SYSDATE() is not an alias
   of NOW() and is unsafe for replication.
   `SYSDATE()' backward compatible aliasing clashes with the idea #12562 
   fix. To make it safe-replicatable we have to either use RBR or to restore
   the pre-5.0 style.
   --sysdate-is-now command line flag was introduced to provide backward compatibility.
This commit is contained in:
aelkin@mysql.com 2006-03-10 16:47:56 +02:00
parent 579271a461
commit d187d410d1
6 changed files with 34 additions and 2 deletions
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4
mysql-test/r/sysdate_is_now.result Normal file
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@ -0,0 +1,4 @@
set timestamp=1;
SELECT sleep(1),NOW()-SYSDATE() as zero;
sleep(1) zero
0 0

1
mysql-test/t/sysdate_is_now-master.opt Normal file
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@ -0,0 +1 @@
--sysdate-is-now

11
mysql-test/t/sysdate_is_now.test Normal file
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@ -0,0 +1,11 @@
#
# BUG#15101 restore aliasing of SYSDATE to NOW in 5.0
# this feature is activated via --sysdate-is-now mysqld init opt
#
# To test here
# 1. SYSDATE() does not distiguish from NOW()
# 2. SYSDATE() obeys set timestamp
set timestamp=1;
SELECT sleep(1),NOW()-SYSDATE() as zero;
# End of 5.0 tests

5
sql/mysqld.cc
View file

@ -4578,6 +4578,7 @@ enum options_mysqld
OPT_DATETIME_FORMAT,
OPT_LOG_QUERIES_NOT_USING_INDEXES,
OPT_DEFAULT_TIME_ZONE,
OPT_SYSDATE_IS_NOW,
OPT_OPTIMIZER_SEARCH_DEPTH,
OPT_OPTIMIZER_PRUNE_LEVEL,
OPT_UPDATABLE_VIEWS_WITH_LIMIT,
@ -5935,6 +5936,10 @@ The minimum value for this variable is 4096.",
(gptr*) &max_system_variables.net_wait_timeout, 0, GET_ULONG,
REQUIRED_ARG, NET_WAIT_TIMEOUT, 1, IF_WIN(INT_MAX32/1000, LONG_TIMEOUT),
0, 1, 0},
{"sysdate-is-now", OPT_SYSDATE_IS_NOW,
"Non-default flag to alias SYSDATE() to NOW() to be safe-replicatable. Since 5.0 SYSDATE returns a `dynamic' value different for different invocation even within a query",
(gptr*) &global_system_variables.sysdate_is_now,
0, 0, GET_BOOL, NO_ARG, 0, 0, 1, 0, 1, 0},
{0, 0, 0, 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}
};

1
sql/sql_class.h
View file

@ -585,6 +585,7 @@ struct system_variables
DATE_TIME_FORMAT *date_format;
DATE_TIME_FORMAT *datetime_format;
DATE_TIME_FORMAT *time_format;
my_bool sysdate_is_now;
};

14
sql/sql_yacc.yy
View file

@ -4671,9 +4671,19 @@ simple_expr:
| SUBSTRING_INDEX '(' expr ',' expr ',' expr ')'
{ $$= new Item_func_substr_index($3,$5,$7); }
| SYSDATE optional_braces
{ $$= new Item_func_sysdate_local(); Lex->safe_to_cache_query=0;}
{
if (global_system_variables.sysdate_is_now == 0)
$$= new Item_func_sysdate_local();
else $$= new Item_func_now_local();
Lex->safe_to_cache_query=0;
}
| SYSDATE '(' expr ')'
{ $$= new Item_func_sysdate_local($3); Lex->safe_to_cache_query=0;}
{
if (global_system_variables.sysdate_is_now == 0)
$$= new Item_func_sysdate_local($3);
else $$= new Item_func_now_local($3);
Lex->safe_to_cache_query=0;
}
| TIME_SYM '(' expr ')'
{ $$= new Item_time_typecast($3); }
| TIMESTAMP '(' expr ')'