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SQL: derived tables improvements [closes #185]

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This commit is contained in:
Aleksey Midenkov
2017-04-28 12:07:04 +03:00
parent 79688b0546
commit 7153ff85a1
11 changed files with 247 additions and 35 deletions
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165
mysql-test/suite/versioning/r/derived.result Normal file
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@ -0,0 +1,165 @@
create table emp
(
emp_id int,
name varchar(127),
mgr int
) with system versioning;
insert into emp values (1, 'bill', 0),
(2, 'bill', 1),
(3, 'kate', 1);
set @ts=now(6);
delete from emp;
insert into emp values (4, 'john', 1);
with ancestors as (select * from emp) select * from ancestors;
emp_id name mgr
4 john 1
set @tmp= "with ancestors as (select * from emp) select * from ancestors";
prepare stmt from @tmp;
execute stmt;
emp_id name mgr
4 john 1
drop prepare stmt;
with ancestors as (select * from emp for system_time all) select * from ancestors;
emp_id name mgr
1 bill 0
2 bill 1
3 kate 1
4 john 1
set @tmp= "with ancestors as (select * from emp for system_time all) select * from ancestors";
prepare stmt from @tmp;
execute stmt;
emp_id name mgr
1 bill 0
2 bill 1
3 kate 1
4 john 1
drop prepare stmt;
with recursive ancestors as (select * from emp) select * from ancestors;
emp_id name mgr
4 john 1
set @tmp= "with recursive ancestors as (select * from emp) select * from ancestors";
prepare stmt from @tmp;
execute stmt;
emp_id name mgr
4 john 1
drop prepare stmt;
select emp_id from (select emp_id from emp where sys_trx_end>'2031-1-1') as tmp;
emp_id
4
set @tmp= "select emp_id from (select emp_id from emp where sys_trx_end>'2031-1-1') as tmp";
prepare stmt from @tmp;
execute stmt;
emp_id
4
drop prepare stmt;
with recursive
ancestors
as
(
select e.emp_id, e.name, e.mgr
from emp as e
where name = 'john'
union
select ee.emp_id, ee.name, ee.mgr
from emp as ee, ancestors as a
where ee.mgr = a.emp_id
)
select * from ancestors;
emp_id name mgr
4 john 1
set @tmp= "
with recursive
ancestors
as
(
select e.emp_id, e.name, e.mgr
from emp as e
where name = 'john'
union
select ee.emp_id, ee.name, ee.mgr
from emp as ee, ancestors as a
where ee.mgr = a.emp_id
)
select * from ancestors";
prepare stmt from @tmp;
execute stmt;
emp_id name mgr
4 john 1
drop prepare stmt;
with recursive
ancestors
as
(
select e.emp_id, e.name, e.mgr
from emp as e for system_time as of timestamp @ts
where name = 'bill'
union
select ee.emp_id, ee.name, ee.mgr
from emp as ee for system_time as of timestamp @ts, ancestors as a for system_time as of timestamp @ts
where ee.mgr = a.emp_id
)
select * from ancestors;
emp_id name mgr
1 bill 0
2 bill 1
3 kate 1
set @tmp= "
with recursive
ancestors
as
(
select e.emp_id, e.name, e.mgr
from emp as e for system_time as of timestamp @ts
where name = 'bill'
union
select ee.emp_id, ee.name, ee.mgr
from emp as ee for system_time as of timestamp @ts, ancestors as a for system_time as of timestamp @ts
where ee.mgr = a.emp_id
)
select * from ancestors";
prepare stmt from @tmp;
execute stmt;
emp_id name mgr
1 bill 0
2 bill 1
3 kate 1
drop prepare stmt;
drop table emp;
create or replace table t1 (x int) with system versioning;
create or replace table t2 (y int) with system versioning;
insert into t1 values (1);
set @t0= now(6);
insert into t1 values (2);
delete from t1 where x = 1;
insert into t2 values (10);
select * from (select *, t1.sys_trx_end, t1.sys_trx_end as endo from t1) as s0;
ERROR HY000: Derived table is prohibited: multiple end system fields `t1.sys_trx_end`, `t1.sys_trx_end` in query!
select * from (select *, t1.sys_trx_end, t2.sys_trx_start from t1, t2) as s0;
ERROR HY000: Derived table is prohibited: system fields from multiple tables `t1`, `t2` in query!
select * from (select * from t1 for system_time as of timestamp @t0, t2) as s0;
x y
1 10
select * from (select *, t1.sys_trx_end from t2, t1 for system_time as of timestamp @t0) as s0;
y x
10 1
select * from (select *, t1.sys_trx_start from t2 for system_time as of now, t1) as s0 query for system_time as of timestamp @t0;
y x
10 1
set @q= concat("create view vt1 as select * from t1 for system_time as of timestamp '", @t0, "'");
prepare q from @q;
execute q;
drop prepare q;
select * from vt1;
x
1
select * from (select * from vt1, t2) as s0;
x y
1 10
select * from (select *, vt1.sys_trx_end from t2, vt1) as s0;
y x
10 1
select * from (select *, vt1.sys_trx_start from t2 for system_time as of now, vt1) as s0 query for system_time as of timestamp @t0;
y x
10 1
drop table t1, t2;
drop view vt1;