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create table t (a int) with system versioning;
set @before= UNIX_TIMESTAMP(now(6));
insert into t values (1);
set @after= UNIX_TIMESTAMP(now(6));
update t set a= 2;
show global variables like 'system_versioning_asof';
Variable_name Value
system_versioning_asof DEFAULT
show variables like 'system_versioning_asof';
Variable_name Value
system_versioning_asof DEFAULT
select * from t;
a
2
set system_versioning_asof= '2031-1-1 0:0:0';
show variables like 'system_versioning_asof';
Variable_name Value
system_versioning_asof 2031-01-01 00:00:00.000000
select * from t;
a
2
set system_versioning_asof= '2011-1-1 0:0:0';
show variables like 'system_versioning_asof';
Variable_name Value
system_versioning_asof 2011-01-01 00:00:00.000000
select * from t;
a
set global system_versioning_asof= 'alley';
ERROR 42000: Variable 'system_versioning_asof' can't be set to the value of 'alley'
set global system_versioning_asof= null;
ERROR 42000: Variable 'system_versioning_asof' can't be set to the value of 'NULL'
set global system_versioning_asof= 1;
ERROR 42000: Incorrect argument type to variable 'system_versioning_asof'
set global system_versioning_asof= 1.1;
ERROR 42000: Incorrect argument type to variable 'system_versioning_asof'
set global system_versioning_asof= '2011-02-29 00:00';
ERROR 42000: Variable 'system_versioning_asof' can't be set to the value of '2011-02-29 00:00'
set global system_versioning_asof= '2011-02-28 24:00';
ERROR 42000: Variable 'system_versioning_asof' can't be set to the value of '2011-02-28 24:00'
set global system_versioning_asof= '2011-00-28 00:00';
ERROR 42000: Variable 'system_versioning_asof' can't be set to the value of '2011-00-28 00:00'
set global system_versioning_asof= '0000-00-00 00:00';
ERROR 42000: Variable 'system_versioning_asof' can't be set to the value of '0000-00-00 00:00'
set system_versioning_asof= 'alley';
ERROR 42000: Variable 'system_versioning_asof' can't be set to the value of 'alley'
set system_versioning_asof= null;
ERROR 42000: Variable 'system_versioning_asof' can't be set to the value of 'NULL'
set system_versioning_asof= 1;
ERROR 42000: Incorrect argument type to variable 'system_versioning_asof'
set system_versioning_asof= 1.1;
ERROR 42000: Incorrect argument type to variable 'system_versioning_asof'
set system_versioning_asof= '2011-02-29 00:00';
ERROR 42000: Variable 'system_versioning_asof' can't be set to the value of '2011-02-29 00:00'
set system_versioning_asof= '2011-02-28 24:00';
ERROR 42000: Variable 'system_versioning_asof' can't be set to the value of '2011-02-28 24:00'
set system_versioning_asof= '2011-00-28 00:00';
ERROR 42000: Variable 'system_versioning_asof' can't be set to the value of '2011-00-28 00:00'
set system_versioning_asof= '0000-00-00 00:00';
ERROR 42000: Variable 'system_versioning_asof' can't be set to the value of '0000-00-00 00:00'
# GLOBAL @@system_versioning_asof
set global system_versioning_asof= '1991-11-11 11:11:11.1111119';
Warnings:
Note 1292 Truncated incorrect datetime value: '1991-11-11 11:11:11.1111119'
show global variables like 'system_versioning_asof';
Variable_name Value
system_versioning_asof 1991-11-11 11:11:11.111111
set global system_versioning_asof= '1990-01-01 00:00:00';
show global variables like 'system_versioning_asof';
Variable_name Value
system_versioning_asof 1990-01-01 00:00:00.000000
set global system_versioning_asof= timestamp'1991-11-11 11:11:11.1111119';
Warnings:
Note 1292 Truncated incorrect datetime value: '1991-11-11 11:11:11.1111119'
show global variables like 'system_versioning_asof';
Variable_name Value
system_versioning_asof 1991-11-11 11:11:11.111111
set @ts= timestamp'1990-01-01 00:00:00';
set global system_versioning_asof= @ts;
show global variables like 'system_versioning_asof';
Variable_name Value
system_versioning_asof 1990-01-01 00:00:00.000000
set global system_versioning_asof= default;
select @@global.system_versioning_asof;
@@global.system_versioning_asof
DEFAULT
# SESSION @@system_versioning_asof
set system_versioning_asof= '1991-11-11 11:11:11.1111119';
Warnings:
Note 1292 Truncated incorrect datetime value: '1991-11-11 11:11:11.1111119'
show variables like 'system_versioning_asof';
Variable_name Value
system_versioning_asof 1991-11-11 11:11:11.111111
set system_versioning_asof= '1990-01-01 00:00:00';
show variables like 'system_versioning_asof';
Variable_name Value
system_versioning_asof 1990-01-01 00:00:00.000000
set system_versioning_asof= timestamp'1991-11-11 11:11:11.1111119';
Warnings:
Note 1292 Truncated incorrect datetime value: '1991-11-11 11:11:11.1111119'
show variables like 'system_versioning_asof';
Variable_name Value
system_versioning_asof 1991-11-11 11:11:11.111111
set @ts= timestamp'1990-01-01 00:00:00';
set system_versioning_asof= @ts;
show variables like 'system_versioning_asof';
Variable_name Value
system_versioning_asof 1990-01-01 00:00:00.000000
# DEFAULT: value is copied from GLOBAL to SESSION
set global time_zone= "+03:00";
set time_zone= "+10:00";
set global system_versioning_asof= timestamp'1991-11-11 11:11:11.111111';
set system_versioning_asof= '1990-01-01 00:00:00';
select @@global.system_versioning_asof != @@system_versioning_asof as different;
different
1
set system_versioning_asof= default;
select @@global.system_versioning_asof != @@system_versioning_asof as different;
different
1
set global system_versioning_asof= default;
select @@global.system_versioning_asof = @@system_versioning_asof as equal;
equal
1
set global time_zone= DEFAULT;
set time_zone= DEFAULT;
set global system_versioning_asof= DEFAULT;
set system_versioning_asof= DEFAULT;
select @@global.system_versioning_asof, @@system_versioning_asof;
@@global.system_versioning_asof @@system_versioning_asof
DEFAULT DEFAULT
select * from t for system_time all;
a
2
1
select * from t;
a
2
select * from t for system_time as of timestamp current_timestamp(6);
a
2
select * from t for system_time all;
a
2
1
select * from t for system_time from '1970-01-01 00:00' to current_timestamp(6);
a
2
1
select * from t for system_time between '1970-01-01 00:00' and current_timestamp(6);
a
2
1
# MDEV-16026: Global system_versioning_asof must not be used if client sessions can have non-default time zone
# changing time zone should not abuse `system_versioning_asof`
set session time_zone = '+10:00';
set global system_versioning_asof = '1999-09-08 00:00:00.000000';
show global variables like 'system_versioning_asof';
Variable_name Value
system_versioning_asof 1999-09-08 00:00:00.000000
set session time_zone = '+03:00';
show global variables like 'system_versioning_asof';
Variable_name Value
system_versioning_asof 1999-09-07 17:00:00.000000
set session time_zone = '+03:00';
set session system_versioning_asof = '2000-09-08 00:00:00.000000';
show session variables like 'system_versioning_asof';
Variable_name Value
system_versioning_asof 2000-09-08 00:00:00.000000
set session time_zone = '+10:00';
show session variables like 'system_versioning_asof';
Variable_name Value
system_versioning_asof 2000-09-08 07:00:00.000000
# global and local time zones should not interfere
show global variables like 'system_versioning_asof';
Variable_name Value
system_versioning_asof 1999-09-08 00:00:00.000000
set time_zone= "+10:00";
set system_versioning_asof= FROM_UNIXTIME(@before);
select * from t as empty;
a
set system_versioning_asof= FROM_UNIXTIME(@after);
select * from t as nonempty;
a
1
set time_zone= "+03:00";
set system_versioning_asof= FROM_UNIXTIME(@before);
select * from t as empty;
a
set system_versioning_asof= FROM_UNIXTIME(@after);
select * from t as nonempty;
a
1
# MDEV-16481: set global system_versioning_asof=sf() crashes in specific case
# Using global variable inside a stored function should not crash
create or replace function now_global() returns timestamp
return CONVERT_TZ(now(), @@session.time_zone, @@global.time_zone);
set global system_versioning_asof= now_global();
drop function now_global;
set global time_zone= "SYSTEM";
set time_zone= "SYSTEM";
set global system_versioning_asof= default;
set system_versioning_asof= default;
show status like "Feature_system_versioning";
Variable_name Value
Feature_system_versioning 2
drop table t;
#
# MDEV-22906 Disallow system_versioning_asof in DML
#
create or replace table t1 (x int) with system versioning;
create or replace table t2 (y int);
insert into t1 values (1);
insert into t2 values (1);
set system_versioning_asof= '1970-01-02 00:00:00';
delete t1, t2 from t1 join t2 where t1.x = t2.y;
select * from t1 for system_time as of timestamp now(6);
x
insert into t1 values (1);
insert into t2 values (1);
update t1, t2 set x= 2, y= 2 where x = y;
select * from t1 for system_time as of timestamp now(6);
x
2
replace t2 select x + 1 from t1;
select * from t2;
y
2
3
insert t2 select x + 2 from t1;
select * from t2;
y
2
3
4
drop tables t1, t2;
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