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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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2
mysql-test/suite/versioning/r/online.result
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@@ -14,7 +14,7 @@ alter table t drop system versioning, algorithm=inplace;
ERROR 0A000: ALGORITHM=INPLACE is not supported. Reason: Not implemented for system-versioned tables. Try ALGORITHM=COPY
set global system_versioning_transaction_registry=on;
Warnings:
Warning 4143 Transaction-based system versioning is EXPERIMENTAL and is subject to change in future.
Warning 4141 Transaction-based system versioning is EXPERIMENTAL and is subject to change in future.
create or replace table t (a int, b int) engine=innodb;
alter table t
add s bigint unsigned as row start,