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SQL, Tests: temporal_current_timestamp for setting default AS OF timestamp [closes #117]

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This commit is contained in:
kevg
2017-02-27 16:31:37 +03:00
committed by Aleksey Midenkov
parent fc7da4dd4f
commit b8bfc06b26
6 changed files with 98 additions and 0 deletions
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38
mysql-test/suite/versioning/r/variables.result Normal file
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@ -0,0 +1,38 @@
create table t (a int) with system versioning;
insert into t values (1);
update t set a=2;
select * from t;
a
2
show variables where Variable_name like "temporal_current_timestamp%";
Variable_name Value
temporal_current_timestamp now
set global temporal_current_timestamp = '2031-1-1 0:0:0';
select * from t;
a
2
set global temporal_current_timestamp = '2011-1-1 0:0:0';
select * from t;
a
set global temporal_current_timestamp = 'all';
select * from t;
a
2
1
show variables where Variable_name like "temporal_current_timestamp%";
Variable_name Value
temporal_current_timestamp all
create view vt as select * from t;
select * from t;
a
2
1
drop view vt;
select * from (select * from t) as tt;
a
2
1
set session temporal_current_timestamp = 'now';
ERROR HY000: Variable 'temporal_current_timestamp' is a GLOBAL variable and should be set with SET GLOBAL
drop table t;
set global temporal_current_timestamp = 'now';

28
mysql-test/suite/versioning/t/variables.test Normal file
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@ -0,0 +1,28 @@
create table t (a int) with system versioning;
insert into t values (1);
update t set a=2;
select * from t;
show variables where Variable_name like "temporal_current_timestamp%";
set global temporal_current_timestamp = '2031-1-1 0:0:0';
select * from t;
set global temporal_current_timestamp = '2011-1-1 0:0:0';
select * from t;
set global temporal_current_timestamp = 'all';
select * from t;
show variables where Variable_name like "temporal_current_timestamp%";
create view vt as select * from t;
select * from t;
drop view vt;
select * from (select * from t) as tt;
--error ER_GLOBAL_VARIABLE
set session temporal_current_timestamp = 'now';
drop table t;
set global temporal_current_timestamp = 'now';

3
sql/mysqld.cc
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@ -781,6 +781,9 @@ char *relay_log_info_file, *report_user, *report_password, *report_host;
char *opt_relay_logname = 0, *opt_relaylog_index_name=0;
char *opt_logname, *opt_slow_logname, *opt_bin_logname;
/* System Versioning */
char *temporal_current_timestamp;
/* Static variables */
static volatile sig_atomic_t kill_in_progress;

1
sql/mysqld.h
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@ -175,6 +175,7 @@ extern char *opt_backup_history_logname, *opt_backup_progress_logname,
*opt_backup_settings_name;
extern const char *log_output_str;
extern const char *log_backup_output_str;
extern char *temporal_current_timestamp;
extern char *mysql_home_ptr, *pidfile_name_ptr;
extern MYSQL_PLUGIN_IMPORT char glob_hostname[FN_REFLEN];
extern char mysql_home[FN_REFLEN];

23
sql/sql_select.cc
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@ -62,6 +62,7 @@
#include <my_bit.h>
#include <hash.h>
#include <ft_global.h>
#include "sys_vars_shared.h"
/*
A key part number that means we're using a fulltext scan.
@ -775,6 +776,28 @@ int vers_setup_select(THD *thd, TABLE_LIST *tables, COND **where_expr,
DBUG_RETURN(-1);
}
if (vers_conditions.type == FOR_SYSTEM_TIME_UNSPECIFIED)
{
const char var[]= "temporal_current_timestamp";
sys_var *sv= intern_find_sys_var(var, sizeof(var) - 1);
DBUG_ASSERT(sv);
const char *data= *(char **)sv->option.value;
DBUG_ASSERT(data);
if (0 == strcmp(data, "all"))
{
vers_conditions.init(FOR_SYSTEM_TIME_ALL, UNIT_TIMESTAMP);
}
else if (0 != strcmp(data, "now"))
{
Item *ts= create_temporal_literal(thd, data, strlen(data),
system_charset_info,
MYSQL_TYPE_DATETIME, true);
if (!ts)
DBUG_RETURN(-1);
vers_conditions.init(FOR_SYSTEM_TIME_AS_OF, UNIT_TIMESTAMP, ts);
}
}
if (vers_conditions.type != FOR_SYSTEM_TIME_UNSPECIFIED)
{
switch (slex->lock_type)

5
sql/sys_vars.cc
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@ -382,6 +382,11 @@ static Sys_var_charptr Sys_basedir(
READ_ONLY GLOBAL_VAR(mysql_home_ptr), CMD_LINE(REQUIRED_ARG, 'b'),
IN_FS_CHARSET, DEFAULT(0));
static Sys_var_charptr sys_temporal_current_timestamp(
"temporal_current_timestamp", "Default AS OF value for versioned tables",
GLOBAL_VAR(temporal_current_timestamp), CMD_LINE(REQUIRED_ARG, 'b'),
IN_FS_CHARSET, DEFAULT("now"));
static Sys_var_ulonglong Sys_binlog_cache_size(
"binlog_cache_size", "The size of the transactional cache for "
"updates to transactional engines for the binary log. "