create table t1 ( x1 int unsigned, Sys_start SYS_DATATYPE as row start invisible comment 'start', Sys_end SYS_DATATYPE as row end invisible comment 'end', period for system_time (Sys_start, Sys_end) ) with system versioning; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `x1` int(10) unsigned DEFAULT NULL, `Sys_start` SYS_DATATYPE GENERATED ALWAYS AS ROW START INVISIBLE COMMENT 'start', `Sys_end` SYS_DATATYPE GENERATED ALWAYS AS ROW END INVISIBLE COMMENT 'end', PERIOD FOR SYSTEM_TIME (`Sys_start`, `Sys_end`) ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING select table_catalog,table_schema,table_name,table_type,version,table_rows,data_free,auto_increment,check_time,table_collation,checksum,create_options,table_comment from information_schema.tables where table_name='t1'; table_catalog def table_schema test table_name t1 table_type SYSTEM VERSIONED version 10 table_rows 0 data_free 0 auto_increment NULL check_time NULL table_collation latin1_swedish_ci checksum NULL create_options table_comment select table_catalog,table_schema,table_name,column_name,ordinal_position,column_default,character_maximum_length,character_octet_length,character_set_name,collation_name,column_key,extra,column_comment,is_generated,generation_expression from information_schema.columns where table_name='t1'; table_catalog def table_schema test table_name t1 column_name x1 ordinal_position 1 column_default NULL character_maximum_length NULL character_octet_length NULL character_set_name NULL collation_name NULL column_key extra column_comment is_generated NEVER generation_expression NULL table_catalog def table_schema test table_name t1 column_name Sys_start ordinal_position 2 column_default NULL character_maximum_length NULL character_octet_length NULL character_set_name NULL collation_name NULL column_key extra STORED GENERATED, INVISIBLE column_comment start is_generated ALWAYS generation_expression ROW START table_catalog def table_schema test table_name t1 column_name Sys_end ordinal_position 3 column_default NULL character_maximum_length NULL character_octet_length NULL character_set_name NULL collation_name NULL column_key extra STORED GENERATED, INVISIBLE column_comment end is_generated ALWAYS generation_expression ROW END # Implicit fields test create or replace table t1 ( x2 int unsigned ) with system versioning; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `x2` int(10) unsigned DEFAULT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING create or replace table t1 ( x3 int unsigned, Sys_start timestamp(6) as row start invisible, Sys_end timestamp(6) as row end invisible, period for system_time (x, Sys_end) ) with system versioning; ERROR HY000: PERIOD FOR SYSTEM_TIME must use columns `Sys_start` and `Sys_end` create or replace table t1 ( x4 int unsigned, Sys_start timestamp(6) as row start invisible, Sys_end2 timestamp(6) as row end invisible, period for system_time (Sys_start, Sys_end) ) with system versioning; ERROR HY000: PERIOD FOR SYSTEM_TIME must use columns `Sys_start` and `Sys_end2` create or replace table t1 ( x5 int unsigned, Sys_start timestamp(6) as row start invisible, Sys_end timestamp(6) as row end invisible, period for system_time (Sys_start, x) ) with system versioning; ERROR HY000: PERIOD FOR SYSTEM_TIME must use columns `Sys_start` and `Sys_end` create or replace table t1 ( x6 int unsigned, period for system_time (Sys_start, Sys_end) ) with system versioning; ERROR HY000: Wrong parameters for `t1`: missing 'AS ROW START' create or replace table t1 ( x7 int unsigned, Sys_start timestamp(6) as row start invisible, Sys_end timestamp(6) as row end invisible, period for system_time (Sys_start, Sys_end) ); ERROR HY000: Wrong parameters for `t1`: missing 'WITH SYSTEM VERSIONING' create or replace table t1 ( x8 int unsigned, Sys_start timestamp(6) as row start invisible, Sys_end timestamp(6) as row end invisible, period for system_time (sys_insert, sys_remove) ) with system versioning; ERROR HY000: PERIOD FOR SYSTEM_TIME must use columns `Sys_start` and `Sys_end` create or replace table t1 ( x9 int unsigned, Sys_start timestamp(6) as row start invisible, Sys_end timestamp(6) as row end invisible, period for system_time (Sys_start, Sys_end) ); ERROR HY000: Wrong parameters for `t1`: missing 'WITH SYSTEM VERSIONING' create or replace table t1 ( x10 int unsigned, Sys_start timestamp(6) as row start invisible, Sys_end timestamp(6) as row end invisible, period for system_time (Sys_start, Sys_start) ); ERROR HY000: Wrong parameters for `t1`: missing 'WITH SYSTEM VERSIONING' create or replace table t1 ( x11 int unsigned, Sys_start bigint unsigned as row start invisible, Sys_end timestamp(6) as row end invisible, period for system_time (Sys_start, Sys_end) ) with system versioning; Got one of the listed errors create or replace table t1 ( x12 int unsigned, Sys_start timestamp(6) as row start invisible, Sys_end bigint unsigned as row end invisible, period for system_time (Sys_start, Sys_end) ) with system versioning; Got one of the listed errors create or replace table t1 ( x13 int unsigned, Sys_start bigint as row start invisible, Sys_end bigint unsigned as row end invisible, period for system_time (Sys_start, Sys_end) ) with system versioning engine innodb; ERROR HY000: `Sys_start` must be of type BIGINT(20) UNSIGNED for system-versioned table `t1` create or replace table t1 ( x14 int unsigned, Sys_start bigint unsigned as row start invisible, Sys_end bigint as row end invisible, period for system_time (Sys_start, Sys_end) ) with system versioning engine innodb; ERROR HY000: `Sys_end` must be of type BIGINT(20) UNSIGNED for system-versioned table `t1` create or replace table t1 ( x15 int with system versioning, B int ); show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `x15` int(11) DEFAULT NULL, `B` int(11) DEFAULT NULL WITHOUT SYSTEM VERSIONING ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING create or replace table t1 ( x16 int with system versioning, B int ) with system versioning; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `x16` int(11) DEFAULT NULL, `B` int(11) DEFAULT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING create or replace table t1 ( x17 int, B int without system versioning ); create or replace table t1 ( x18 int, B int without system versioning ) with system versioning; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `x18` int(11) DEFAULT NULL, `B` int(11) DEFAULT NULL WITHOUT SYSTEM VERSIONING ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING create or replace table t1 ( x19 int with system versioning, B int without system versioning ); show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `x19` int(11) DEFAULT NULL, `B` int(11) DEFAULT NULL WITHOUT SYSTEM VERSIONING ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING create or replace table t1 ( x20 int with system versioning, B int without system versioning ) with system versioning; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `x20` int(11) DEFAULT NULL, `B` int(11) DEFAULT NULL WITHOUT SYSTEM VERSIONING ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING create or replace table t1 ( x21 int without system versioning ); create or replace table t1 ( x22 int without system versioning ) with system versioning; ERROR HY000: Table `t1` must have at least one versioned column create or replace table t1 (a int) with system versioning; create table tt1 like t1; show create table tt1; Table Create Table tt1 CREATE TABLE `tt1` ( `a` int(11) DEFAULT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING drop table tt1; create temporary table tt1 like t1; Warnings: Warning 1105 System versioning is stripped from temporary `test.tt1` # Temporary is stripped from versioning show create table tt1; Table Create Table tt1 CREATE TEMPORARY TABLE `tt1` ( `a` int(11) DEFAULT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci # CREATE TABLE ... SELECT create or replace table t1 (x23 int) with system versioning; create or replace table t0( y int, st timestamp(6) as row start, en timestamp(6) as row end, period for system_time (st, en) ) with system versioning; ## For non-versioned table: ### 1. invisible fields are not included create or replace table t2 as select * from t1; show create table t2; Table Create Table t2 CREATE TABLE `t2` ( `x23` int(11) DEFAULT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci ### 2. all visible fields are included create or replace table t3 as select * from t0; select * from t0; y st en show create table t3; Table Create Table t3 CREATE TABLE `t3` ( `y` int(11) DEFAULT NULL, `st` timestamp(6) NOT NULL, `en` timestamp(6) NOT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci ## For versioned table insert into t1 values (1); select row_start from t1 into @row_start; Warnings: Warning 1287 ' INTO FROM...' instead insert into t0 (y) values (2); select st from t0 into @st; Warnings: Warning 1287 ' INTO FROM...' instead create or replace table t2 with system versioning as select * from t1; show create table t2; Table Create Table t2 CREATE TABLE `t2` ( `x23` int(11) DEFAULT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING #### invisible fields are not copied select * from t2; x23 1 select * from t2 where row_start <= @row_start; x23 ### 2. source table with visible system fields, target with invisible create or replace table t3 with system versioning as select * from t0; show create table t3; Table Create Table t3 CREATE TABLE `t3` ( `y` int(11) DEFAULT NULL, `st` timestamp(6) NOT NULL, `en` timestamp(6) NOT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING select * from t3 where y > 2; y st en select y from t3 where st = @st and row_start > @st; y 2 ### 3. source and target table with visible system fields create or replace table t3 ( st timestamp(6) as row start invisible, en timestamp(6) as row end invisible, period for system_time (st, en) ) with system versioning as select * from t0; show create table t3; Table Create Table t3 CREATE TABLE `t3` ( `y` int(11) DEFAULT NULL, `st` timestamp(6) GENERATED ALWAYS AS ROW START INVISIBLE, `en` timestamp(6) GENERATED ALWAYS AS ROW END INVISIBLE, PERIOD FOR SYSTEM_TIME (`st`, `en`) ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING select y from t3; y 2 select y from t3 where st = @st; y ### 4. system fields not or wrongly selected create or replace table t3 with system versioning select x23 from t1; show create table t3; Table Create Table t3 CREATE TABLE `t3` ( `x23` int(11) DEFAULT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING select * from t3; x23 1 create or replace table t3 with system versioning select x23, row_start from t1; ERROR 42S21: Duplicate column name 'row_start' create or replace table t3 with system versioning select x23, row_end from t1; ERROR 42S21: Duplicate column name 'row_end' # Prepare checking for historical row delete from t1; select row_end from t1 for system_time all into @row_end; Warnings: Warning 1287 ' INTO FROM...' instead delete from t0; select en from t0 for system_time all into @en; Warnings: Warning 1287 ' INTO FROM...' instead ## Combinations of versioned + non-versioned create or replace table t2 (y int); insert into t2 values (3); create or replace table t3 with system versioning select * from t1 for system_time all, t2; show create table t3; Table Create Table t3 CREATE TABLE `t3` ( `x23` int(11) DEFAULT NULL, `y` int(11) DEFAULT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING select * from t3 for system_time all; x23 y 1 3 select * from t3 for system_time all where row_start = @row_start and row_end = @row_end; x23 y create or replace table t2 like t0; insert into t2 (y) values (1), (2); delete from t2 where y = 2; create or replace table t3 select * from t2 for system_time all; select st, en from t3 where y = 1 into @st, @en; Warnings: Warning 1287 ' INTO FROM...' instead select y from t2 for system_time all where st = @st and en = @en; y 1 select st, en from t3 where y = 2 into @st, @en; Warnings: Warning 1287 ' INTO FROM...' instead select y from t2 for system_time all where st = @st and en = @en; y 2 ## Default engine detection create or replace table t1 (x25 int) with system versioning engine NON_DEFAULT_ENGINE; create or replace table t2 as select x25, row_start, row_end from t1 for system_time all; show create table t2; Table Create Table t2 CREATE TABLE `t2` ( `x25` int(11) DEFAULT NULL, `row_start` timestamp(6) NOT NULL, `row_end` timestamp(6) NOT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci create or replace table t2 with system versioning as select x25, row_start rs, row_end re from t1; show create table t2; Table Create Table t2 CREATE TABLE `t2` ( `x25` int(11) DEFAULT NULL, `rs` timestamp(6) NOT NULL, `re` timestamp(6) NOT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING create or replace table t1 ( x26 int, st bigint unsigned as row start, en bigint unsigned as row end, period for system_time (st, en) ) with system versioning engine innodb; create or replace table t2 with system versioning engine myisam as select * from t1; show create table t2; Table Create Table t2 CREATE TABLE `t2` ( `x26` int(11) DEFAULT NULL, `st` bigint(20) unsigned NOT NULL, `en` bigint(20) unsigned NOT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING create or replace table t1 (x27 int, id int) with system versioning engine NON_DEFAULT_ENGINE; create or replace table t2 (b int, id int); create or replace table t3 with system versioning as select t2.b, t1.x27, t1.row_start rs, t1.row_end re from t2 inner join t1 on t2.id=t1.id; show create table t3; Table Create Table t3 CREATE TABLE `t3` ( `b` int(11) DEFAULT NULL, `x27` int(11) DEFAULT NULL, `rs` timestamp(6) NOT NULL, `re` timestamp(6) NOT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING ## Errors create or replace temporary table t (x28 int) with system versioning; ERROR HY000: System-versioned tables do not support CREATE TEMPORARY TABLE create or replace table t1 ( x29 int unsigned, Sys_start0 timestamp(6) as row start invisible, Sys_start timestamp(6) as row start invisible, Sys_end timestamp(6) as row end invisible, period for system_time (Sys_start, Sys_end) ) with system versioning; ERROR HY000: Duplicate ROW START column `Sys_start` create or replace table t1 ( x29 int unsigned, Sys_end0 timestamp(6) as row end invisible, Sys_start timestamp(6) as row start invisible, Sys_end timestamp(6) as row end invisible, period for system_time (Sys_start, Sys_end) ) with system versioning; ERROR HY000: Duplicate ROW END column `Sys_end` ## System fields detection create or replace table t1 (x30 int) with system versioning; create or replace table t2 ( y int, st timestamp(6) as row start invisible, en timestamp(6) as row end invisible, period for system_time (st, en) ) with system versioning; create or replace table t3 as select x30, y, row_start, row_end, st, en from t1, t2; show create table t3; Table Create Table t3 CREATE TABLE `t3` ( `x30` int(11) DEFAULT NULL, `y` int(11) DEFAULT NULL, `row_start` timestamp(6) NOT NULL, `row_end` timestamp(6) NOT NULL, `st` timestamp(6) NOT NULL, `en` timestamp(6) NOT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci create or replace table t3 ( y int, st timestamp(6) as row start invisible, en timestamp(6) as row end invisible, period for system_time (st, en) ) with system versioning as select x30, y, row_start, row_end, st, en from t1, t2; show create table t3; Table Create Table t3 CREATE TABLE `t3` ( `x30` int(11) DEFAULT NULL, `y` int(11) DEFAULT NULL, `row_start` timestamp(6) NOT NULL, `row_end` timestamp(6) NOT NULL, `st` timestamp(6) GENERATED ALWAYS AS ROW START INVISIBLE, `en` timestamp(6) GENERATED ALWAYS AS ROW END INVISIBLE, PERIOD FOR SYSTEM_TIME (`st`, `en`) ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING # MDEV-14828 Server crashes in JOIN::prepare / setup_fields on 2nd execution of PS [#437] create or replace table t1 (x int) with system versioning; prepare bad from 'create or replace table t2 with system versioning as select * from t1'; execute bad; execute bad; execute bad; execute bad; execute bad; execute bad; execute bad; execute bad; # bad is good. # MDEV-15413 Unexpected errors upon CREATE TABLE .. WITH SYSTEM VERSIONING AS SELECT ... create or replace table t1 with system versioning as select 1 as i; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `i` int(1) NOT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING create or replace table t1 (i int) with system versioning as select 1 as i; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `i` int(11) DEFAULT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING create or replace table t1 ( a int, row_start bigint as row start, row_end bigint as row end, period for system_time (row_start, row_end) ) engine=innodb with system versioning; ERROR HY000: `row_start` must be of type BIGINT(20) UNSIGNED for system-versioned table `t1` create or replace table t1 ( a int, row_start bigint as row start, row_end bigint as row end, period for system_time (row_start, row_end) ) engine=myisam with system versioning; ERROR HY000: `row_start` must be of type BIGINT(20) UNSIGNED for system-versioned table `t1` create table t ( a int, row_start datetime(6) generated always as row start, row_end datetime(6) generated always as row end, period for system_time(row_start, row_end) ) with system versioning; ERROR HY000: `row_start` must be of type TIMESTAMP(6) for system-versioned table `t` # MDEV-16490 It's possible to make a system versioned table without any versioning field create or replace table t1 (x int without system versioning) with system versioning select 1 as y; create or replace table t1 (x int without system versioning) with system versioning select 1 as x; ERROR HY000: Table `t1` must have at least one versioned column drop tables t0, t1, t2, t3; # # MDEV-23968 CREATE TEMPORARY TABLE .. LIKE (system versioned table) returns error if unique index is defined in the table # create table t1 (id int primary key, index(row_start)) with system versioning; ERROR 42000: Key column 'row_start' doesn't exist in table create table t1 (id int primary key, index(row_end)) with system versioning; ERROR 42000: Key column 'row_end' doesn't exist in table create table t1 (id int, primary key(id, row_end, row_end)) with system versioning; ERROR 42000: Key column 'row_end' doesn't exist in table create table t1 (id int primary key) with system versioning; create temporary table t2 like t1; Warnings: Warning 1105 System versioning is stripped from temporary `test.t2` show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `id` int(11) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING show create table t2; Table Create Table t2 CREATE TEMPORARY TABLE `t2` ( `id` int(11) NOT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci drop temporary table t2; create or replace table t1 ( a int, row_start timestamp(6) as row start, row_end timestamp(6) as row end, period for system_time (row_start, row_end), index(row_start), index(row_end), primary key(row_end, a, row_start), index(row_end, row_start, a)) with system versioning; create temporary table t2 like t1; Warnings: Warning 1105 System versioning is stripped from temporary `test.t2` show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) NOT NULL, `row_start` timestamp(6) GENERATED ALWAYS AS ROW START, `row_end` timestamp(6) GENERATED ALWAYS AS ROW END, PRIMARY KEY (`row_end`,`a`,`row_start`), KEY `row_start` (`row_start`), KEY `row_end` (`row_end`), KEY `row_end_2` (`row_end`,`row_start`,`a`), PERIOD FOR SYSTEM_TIME (`row_start`, `row_end`) ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING show create table t2; Table Create Table t2 CREATE TEMPORARY TABLE `t2` ( `a` int(11) NOT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci drop temporary table t2; drop table t1; # # MDEV-16857 system-invisible row_end is displayed in SHOW INDEX # create or replace table t1 (id int primary key, x int) with system versioning; select table_schema, table_name, non_unique, index_schema, index_name, seq_in_index, column_name from information_schema.statistics where table_name = 't1'; table_schema table_name non_unique index_schema index_name seq_in_index column_name test t1 0 test PRIMARY 1 id show index from t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored t1 0 PRIMARY 1 id # # # # # # NO show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `id` int(11) NOT NULL, `x` int(11) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING drop table t1; # # MDEV-26928 Column-inclusive WITH SYSTEM VERSIONING doesn't work with explicit system fields # create or replace table t1 (x int, y int with system versioning); show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `x` int(11) DEFAULT NULL WITHOUT SYSTEM VERSIONING, `y` int(11) DEFAULT NULL ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING create or replace table t1 ( x int, y int with system versioning, row_start timestamp(6) as row start, row_end timestamp(6) as row end, period for system_time(row_start, row_end)); show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `x` int(11) DEFAULT NULL WITHOUT SYSTEM VERSIONING, `y` int(11) DEFAULT NULL, `row_start` timestamp(6) GENERATED ALWAYS AS ROW START, `row_end` timestamp(6) GENERATED ALWAYS AS ROW END, PERIOD FOR SYSTEM_TIME (`row_start`, `row_end`) ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci WITH SYSTEM VERSIONING drop table t1; # # MDEV-27452 TIMESTAMP(0) system field is allowed for certain creation of system-versioned table # create or replace table t ( a int, s timestamp as row start, e timestamp as row end, period for system_time (s, e)) with system versioning; ERROR HY000: `s` must be of type TIMESTAMP(6) for system-versioned table `t` create or replace table t ( a int with system versioning, s timestamp as row start, e timestamp as row end, period for system_time (s, e)); ERROR HY000: `s` must be of type TIMESTAMP(6) for system-versioned table `t` create or replace table t ( a int with system versioning, b int with system versioning, s timestamp(6) as row start, e timestamp(6) as row end, period for system_time (s, e)); insert into t () values (),(); drop table t;