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
Window definitions are resolved during fix fields. Updating used tables
for window functions must be done after all window functions have had a
chance to be resolved.
There was an additional problem with the implementation: expressions that
contained window functions never updated the expression's used tables.
To fix both these issues, make sure to call "update_used_tables" on all
items that contain window functions after we have passed through all
items.
Merge branch '10.3' into trunk
Both field_visibility and VERS_HIDDEN_FLAG exist independently.
TODO:
VERS_HIDDEN_FLAG should be replaced with SYSTEM_INVISIBLE (or COMPLETELY_INVISIBLE?).
Includes Spider patches
- 062_mariadb-10.2.0.direct_join_1and3.diff
- 063_mariadb-10.2.0.direct_join_for_single_partition.diff
- Test cases from Kentoku
Allows Spider to push full joins to the Spider engine trough the
create_group_by interface.
Other things:
- Increased MYSQL_VERSION_ID to check for 10211 (latest 10.2 version)
- Fix for const_table at calling create_group_by().
Original author: Kentoku SHIBA
Contains Spiral patches:
007_mariadb-10.2.0.partition_fulltext.diff MDEV-7705
038_mariadb-10.2.0.partition_fulltext2.diff MDEV-7734
This commit has the following differences compared to the original
patches:
- Added necessary full text search cleanup at the storage engine layer
that was omitted in the original patch.
- Added test case.
- A lot of code cleanups to make the code notable smaller.
- Changed SQL code to use ha_ft_end() instead of ft_end()
Original author: Kentoku SHIBA
First reviewer: Jacob Mathew
Second reviewer: Michael Widenius
This was done to make thing consistent. It gives the additional benefit
that EXPLAIN EXTENDED now treat null_tables like constant's and replaces
columns with NULL, in a similar way that it replaces columns with constants
for constant tables.
- Null tables are tables where all columns are always NULL. The most common
NULL TABLE is a table used in a LEFT_JOIN that is never true.
- All result changes comes from replacing columns with NULL for null_tables.
- "Impossible where" is now also shows constants for const columns.
- Removed duplicated s->type= JT_CONST
- Reset found_const_table_map when JOIN is created (safety fix)
Affected tests (forced mode):
main.index_merge_myisam
After optimization versioning AND takes operands from WHERE AND
leaving `select_lex->where` as empty dangling AND.
TODO:
- Make get_thd_memroot() inline
- To do this, we need to reduce dependence of include files, especially
so that sql_class.h is not depending in item.h
Most "new" failures fixed in the following files:
- sql_select.cc
- item.cc
- item_func.cc
- opt_subselect.cc
Other things:
- Allocate udf_handler strings in mem_root
- Required changes in sql_string.h
- Add mem_root as argument to some new [] calls
- Mark udf_handler strings as thread specific
- Removed some comment blocks with code
