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SQL: derived SYSTEM_TIME clash detection [closes #371]

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This commit is contained in:
Aleksey Midenkov
2017-12-06 06:14:22 +03:00
parent d04063c5b9
commit 84b718ae70
9 changed files with 145 additions and 75 deletions
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50
mysql-test/suite/versioning/r/derived.result
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@ -133,25 +133,28 @@ 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);
delete from t1;
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!
# SYSTEM_TIME propagation from inner to outer
select * from (select * from t1 for system_time as of timestamp @t0, t2) as s0;
x y
1 10
with s1 as (select * from t1 for system_time as of timestamp @t0, t2) select * from s1;
x y
1 10
# leading table selection
select * from (select *, t1.sys_trx_end from t2, t1 for system_time as of timestamp @t0) as s2;
y x
10 1
with s3 as (select *, t1.sys_trx_end from t2, t1 for system_time as of timestamp @t0) select * from s3;
y x
10 1
# SYSTEM_TIME propagation from outer to inner
select * from (select *, t1.sys_trx_start from t2 for system_time as of current_timestamp, t1) as s4 for system_time as of timestamp @t0;
y x
10 1
@ -161,21 +164,56 @@ y x
with s6 as (select *, t1.sys_trx_start from t2 for system_time as of current_timestamp, t1) select * from s6 for system_time as of timestamp @t0;
y x
10 1
### VIEW instead of t1
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;
create view vt2 as select * from t1;
# SYSTEM_TIME propagation from view
select * from vt1;
x
1
# SYSTEM_TIME propagation from inner to outer
select * from (select * from vt1, t2) as s0;
x y
1 10
# leading table selection
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 current_timestamp, vt1) as s0 for system_time as of timestamp @t0;
y x
10 1
drop table t1, t2;
drop view vt1;
### SYSTEM_TIME clash
select * from (select * from t1 for system_time all) dt0 for system_time all;
ERROR HY000: SYSTEM_TIME is not allowed outside historical `dt0`
select * from vt1 for system_time all;
ERROR HY000: SYSTEM_TIME is not allowed outside historical `vt1`
with dt1 as (select * from t1 for system_time all)
select * from dt1 for system_time all;
ERROR HY000: SYSTEM_TIME is not allowed outside historical `dt1`
### UNION
set @t1= now(6);
delete from t2;
insert into t2 values (3);
# SYSTEM_TIME is not propagated
select x from t1 union
select y from t2;
x
2
3
select x from t1 for system_time as of @t0 union
select y from t2;
x
1
3
select x from t1 union
select y from t2 for system_time as of @t1;
x
2
10
select x from t1 for system_time as of @t0 union
select y from t2 for system_time as of @t1;
x
1
10
drop database test;
create database test;