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236 lines
6.4 KiB
Text
236 lines
6.4 KiB
Text
create table emp
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(
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emp_id int,
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name varchar(127),
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mgr int
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) with system versioning;
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insert into emp values (1, 'bill', 0),
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(2, 'bill', 1),
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(3, 'kate', 1);
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set @ts=now(6);
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delete from emp;
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insert into emp values (4, 'john', 1);
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with ancestors as (select * from emp) select * from ancestors;
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set @tmp= "with ancestors as (select * from emp) select * from ancestors";
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prepare stmt from @tmp; execute stmt; drop prepare stmt;
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with ancestors as (select * from emp for system_time all) select * from ancestors;
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set @tmp= "with ancestors as (select * from emp for system_time all) select * from ancestors";
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prepare stmt from @tmp; execute stmt; drop prepare stmt;
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with recursive ancestors as (select * from emp) select * from ancestors;
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set @tmp= "with recursive ancestors as (select * from emp) select * from ancestors";
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prepare stmt from @tmp; execute stmt; drop prepare stmt;
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select emp_id from (select emp_id from emp where row_end>'2031-1-1') as tmp;
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set @tmp= "select emp_id from (select emp_id from emp where row_end>'2031-1-1') as tmp";
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prepare stmt from @tmp; execute stmt; drop prepare stmt;
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with recursive
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ancestors
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as
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(
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select e.emp_id, e.name, e.mgr
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from emp as e
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where name = 'john'
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union
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select ee.emp_id, ee.name, ee.mgr
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from emp as ee, ancestors as a
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where ee.mgr = a.emp_id
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)
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select * from ancestors;
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set @tmp= "
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with recursive
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ancestors
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as
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(
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select e.emp_id, e.name, e.mgr
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from emp as e
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where name = 'john'
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union
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select ee.emp_id, ee.name, ee.mgr
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from emp as ee, ancestors as a
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where ee.mgr = a.emp_id
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)
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select * from ancestors";
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prepare stmt from @tmp; execute stmt; drop prepare stmt;
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#385
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with recursive
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ancestors
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as
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(
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select e.emp_id, e.name, e.mgr
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from emp for system_time as of timestamp @ts as e
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where name = 'bill'
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union
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select ee.emp_id, ee.name, ee.mgr
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from emp for system_time as of timestamp @ts as ee,
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ancestors as a
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where ee.mgr = a.emp_id
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)
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select * from ancestors;
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set @tmp= "
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with recursive
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ancestors
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as
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(
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select e.emp_id, e.name, e.mgr
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from emp for system_time as of timestamp @ts as e
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where name = 'bill'
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union
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select ee.emp_id, ee.name, ee.mgr
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from emp for system_time as of timestamp @ts as ee,
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ancestors as a
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where ee.mgr = a.emp_id
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)
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select * from ancestors";
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prepare stmt from @tmp; execute stmt; drop prepare stmt;
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drop table emp;
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create or replace table t1 (x int) with system versioning;
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create or replace table t2 (y int) with system versioning;
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insert into t1 values (1);
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set @t0= now(6);
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delete from t1;
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insert into t1 values (2);
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insert into t2 values (10);
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--replace_column 2 # 3 #
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select * from (select *, t1.row_end, t1.row_end as endo from t1) as s0;
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--replace_column 3 # 4 #
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select * from (select *, t1.row_end, t2.row_start from t1, t2) as s0;
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--echo # SYSTEM_TIME propagation from inner to outer
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select * from (select * from t1 for system_time as of timestamp @t0, t2) as s0;
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with s1 as (select * from t1 for system_time as of timestamp @t0, t2) select * from s1;
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--echo # leading table selection
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--replace_column 3 #
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select * from (select *, t1.row_end from t2, t1 for system_time as of timestamp @t0) as s2;
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--replace_column 3 #
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with s3 as (select *, t1.row_end from t2, t1 for system_time as of timestamp @t0) select * from s3;
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--echo ### VIEW instead of t1
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set @q= concat("create view vt1 as select * from t1 for system_time as of timestamp '", @t0, "'");
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prepare q from @q; execute q; drop prepare q;
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create view vt2 as select * from t1;
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--echo # SYSTEM_TIME propagation from view
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select * from vt1;
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--echo # SYSTEM_TIME propagation from inner to outer
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select * from (select * from vt1, t2) as s0;
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--echo ### SYSTEM_TIME clash
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--error ER_VERS_NOT_VERSIONED
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select * from (select * from t1 for system_time all) for system_time all as dt0;
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--error ER_VERS_NOT_VERSIONED
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select * from vt1 for system_time all;
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--error ER_VERS_NOT_VERSIONED
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with dt1 as (select * from t1 for system_time all)
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select * from dt1 for system_time all;
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--echo ### UNION
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set @t1= now(6);
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delete from t2;
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insert into t2 values (3);
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--echo # SYSTEM_TIME is not propagated
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select x from t1 union
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select y from t2;
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select x from t1 for system_time as of @t0 union
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select y from t2;
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select x from t1 union
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select y from t2 for system_time as of @t1;
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select x from t1 for system_time as of @t0 union
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select y from t2 for system_time as of @t1;
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--echo # LEFT/RIGHT JOIN
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create or replace table t1 (x int, y int) with system versioning;
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create or replace table t2 (x int, y int) with system versioning;
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insert into t1 values (1, 1), (1, 2), (1, 3), (4, 4), (5, 5);
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insert into t2 values (1, 2), (2, 1), (3, 1);
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--echo ## Outer or inner SYSTEM_TIME produces same expression
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--disable_warnings
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--disable_query_log
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explain extended
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select * from (
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select t1.x, t1.y as y1, t2.x as x2, t2.y as y2
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from t1 join t2 on t1.x = t2.x) for system_time as of now() as t;
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let $a=`show warnings`;
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--echo Query A:
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echo $a;
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explain extended
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select * from (
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select t1.x, t1.y as y1, t2.x as x2, t2.y as y2
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from t1 for system_time as of now()
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join t2 for system_time as of now() on t1.x = t2.x) as t;
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let $b=`show warnings`;
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--echo Query B:
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echo $b;
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if ($a == $b)
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{
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--echo Fine result: queries A and B are equal.
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}
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--enable_query_log
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--enable_warnings
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--echo ## LEFT JOIN: t1, t2 versioned
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select * from (
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select t1.x as LJ1_x1, t1.y as y1, t2.x as x2, t2.y as y2
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from t1 left join t2 on t1.x = t2.x)
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as derived;
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alter table t2 drop system versioning;
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--echo ## LEFT JOIN: t1 versioned
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select * from (
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select t1.x as LJ2_x1, t1.y as y1, t2.x as x2, t2.y as y2
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from t1 left join t2 on t1.x = t2.x)
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as derived;
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alter table t1 drop system versioning;
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alter table t2 add system versioning;
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--echo ## LEFT JOIN: t2 versioned
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select * from (
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select t1.x as LJ3_x1, t1.y as y1, t2.x as x2, t2.y as y2
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from t1 left join t2 on t1.x = t2.x)
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as derived;
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alter table t1 add system versioning;
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--echo ## RIGHT JOIN: t1, t2 versioned
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select * from (
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select t1.x as RJ1_x1, t1.y as y1, t2.x as x2, t2.y as y2
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from t1 right join t2 on t1.x = t2.x)
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as derived;
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alter table t2 drop system versioning;
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--echo ## RIGHT JOIN: t1 versioned
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select * from (
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select t1.x as RJ2_x1, t1.y as y1, t2.x as x2, t2.y as y2
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from t1 right join t2 on t1.x = t2.x)
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as derived;
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alter table t1 drop system versioning;
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alter table t2 add system versioning;
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--echo ## RIGHT JOIN: t2 versioned
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select * from (
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select t1.x as RJ3_x1, t1.y as y1, t2.x as x2, t2.y as y2
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from t1 right join t2 on t1.x = t2.x)
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as derived;
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drop table t1, t2;
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drop view vt1, vt2;
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