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SQL: derived, hiding, error messages

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Many related changes.

Note that AS OF condition must always be pushed down to physical tables,
it cannot be applied to a derived or a view. Thus:

* no versioning for internal temporary tables, they can never store
  historical data.
* remove special versioning code from mysql_derived_prepare and
  remove ER_VERS_DERIVED_PROHIBITED - derived can have no historical
  data and cannot be prohibited for system versioning related reasons.
* do not expand select list for derived/views with sys vers fields,
  derived/views can never have historical data.
* remove special invisiblity rules for sys vers fields, they are no
  longer needed after the previous change
* remove system_versioning_hide, it lost the meaning after the
  previous change.
* remove ER_VERS_SYSTEM_TIME_CLASH, it's no "clash", the inner
  AS OF clause always wins.
* non-versioned fields in a historical query

reword the warning text, downgrade to note, don't
replace values with NULLs
This commit is contained in:
Sergei Golubchik
2017-12-30 13:40:36 +01:00
committed by Aleksey Midenkov
parent b06b5c3eab
commit e6a7457653
35 changed files with 98 additions and 451 deletions
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20
mysql-test/suite/versioning/r/derived.result
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@ -135,9 +135,11 @@ delete from t1;
insert into t1 values (2);
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!
x sys_trx_end endo
2 # #
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!
x y sys_trx_end sys_trx_start
2 10 # #
# SYSTEM_TIME propagation from inner to outer
select * from (select * from t1 for system_time as of timestamp @t0, t2) as s0;
x y
@ -147,11 +149,11 @@ 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
y x sys_trx_end
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
y x sys_trx_end
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;
@ -168,12 +170,12 @@ x y
1 10
### SYSTEM_TIME clash
select * from (select * from t1 for system_time all) for system_time all as dt0;
ERROR HY000: SYSTEM_TIME is not allowed outside historical `dt0`
ERROR HY000: Table `dt0` is not system-versioned
select * from vt1 for system_time all;
ERROR HY000: SYSTEM_TIME is not allowed outside historical `vt1`
ERROR HY000: Table `vt1` is not system-versioned
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`
ERROR HY000: Table `dt1` is not system-versioned
### UNION
set @t1= now(6);
delete from t2;