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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.


sql/mysqld.cc:
  New option to force SYSDATE's backward compatible with 4.1 aliasing to NOW (not default)
sql/sql_class.h:
  new slot to fill at init time and check at parse
sql/sql_yacc.yy:
  calling NOW's branches when --sysdate-is-now
mysql-test/r/sysdate_is_now.result:
  New BitKeeper file ``mysql-test/r/sysdate_is_now.result''
mysql-test/t/sysdate_is_now-master.opt:
  New BitKeeper file ``mysql-test/t/sysdate_is_now-master.opt''
mysql-test/t/sysdate_is_now.test:
  New BitKeeper file ``mysql-test/t/sysdate_is_now.test''
This commit is contained in:
unknown
2006-03-10 16:47:56 +02:00
parent 696367399b
commit 8f543b5eb8
6 changed files with 34 additions and 2 deletions
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5
sql/mysqld.cc
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@ -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}
};