BitKeeper/etc/logging_ok:
auto-union
Docs/Support/texi2html:
Auto merged
include/mysql.h:
Auto merged
include/mysql_com.h:
Auto merged
libmysql/libmysql.c:
Auto merged
myisam/mi_check.c:
Auto merged
myisam/myisamchk.c:
Auto merged
mysql-test/include/ps_modify.inc:
Auto merged
mysql-test/mysql-test-run.sh:
Auto merged
mysql-test/r/ctype_recoding.result:
Auto merged
mysql-test/r/fulltext.result:
Auto merged
mysql-test/r/gis.result:
Auto merged
mysql-test/r/ndb_blob.result:
Auto merged
mysql-test/r/ps_2myisam.result:
Auto merged
mysql-test/r/ps_3innodb.result:
Auto merged
mysql-test/r/ps_4heap.result:
Auto merged
mysql-test/r/ps_5merge.result:
Auto merged
mysql-test/r/ps_6bdb.result:
Auto merged
mysql-test/r/sql_mode.result:
Auto merged
mysql-test/t/join_outer.test:
Auto merged
mysql-test/t/key.test:
Auto merged
mysql-test/t/range.test:
Auto merged
mysql-test/t/show_check.test:
Auto merged
mysql-test/t/sql_mode.test:
Auto merged
sql/field.cc:
Auto merged
sql/ha_ndbcluster.cc:
Auto merged
sql/ha_ndbcluster.h:
Auto merged
sql/item.h:
Auto merged
sql/item_create.cc:
Auto merged
sql/item_func.cc:
Auto merged
sql/item_func.h:
Auto merged
sql/item_strfunc.cc:
Auto merged
sql/item_timefunc.cc:
Auto merged
sql/mysqld.cc:
Auto merged
sql/net_serv.cc:
Auto merged
sql/protocol.cc:
Auto merged
sql/protocol.h:
Auto merged
sql/sql_class.cc:
Auto merged
sql/sql_handler.cc:
Auto merged
sql/sql_parse.cc:
Auto merged
sql/sql_show.cc:
Auto merged
sql/sql_string.cc:
Auto merged
sql/sql_string.h:
Auto merged
sql/sql_table.cc:
Auto merged
client/mysqltest.c:
Merge with 4.1
mysql-test/r/range.result:
Merge with 4.1
Added missing drop table test
sql/ha_innodb.cc:
Merge with 4.1
sql/item.cc:
Merge with 4.1
sql/item_cmpfunc.cc:
Merge with 4.1
sql/opt_range.cc:
Merge with 4.1
sql/sql_prepare.cc:
Merge with 4.1
tests/client_test.c:
Merge with 4.1
Added code to support --silent
configure.in:
Merge with 4.1
ndb/src/common/util/version.c:
Merge with 4.1
Bug #6045: Binary Comparison regression in MySQL 4.1
Binary searches didn't use a case insensitive index, now they do.
mysql-test/t/range.test:
Bug #6045: Binary Comparison regression in MySQL 4.1
Binary searches didn't use a case insensitive index, now they do.
mysql-test/r/range.result:
Bug #6045: Binary Comparison regression in MySQL 4.1
Binary searches didn't use a case insensitive index, now they do.
sql/opt_range.cc:
Bug #6045: Binary Comparison regression in MySQL 4.1
Binary searches didn't use a case insensitive index, now they do.
BitKeeper/etc/ignore:
auto-union
mysql-test/r/grant2.result:
Auto merged
mysql-test/r/sql_mode.result:
Auto merged
mysql-test/t/grant2.test:
Auto merged
sql/handler.cc:
Auto merged
sql/handler.h:
Auto merged
sql/mysql_priv.h:
Auto merged
sql/mysqld.cc:
Auto merged
sql/opt_range.cc:
Auto merged
sql/set_var.cc:
Auto merged
sql/sql_acl.cc:
Auto merged
sql/sql_lex.h:
Auto merged
sql/sql_parse.cc:
Auto merged
sql/sql_yacc.yy:
Auto merged
FOUND is not a reserved keyword anymore
Added Item_field::set_no_const_sub() to be able to mark fields that can't be substituted
Added 'simple_select' method to be able to quickly determinate if a select_result is a normal SELECT
Note that the 5.0 tree is not yet up to date: Sanja will have to fix multi-update-locks for this merge to be complete
BUILD/SETUP.sh:
Portability fix
client/mysqltest.c:
Portability fix
mysql-test/r/drop.result:
updated results
mysql-test/r/func_str.result:
New warnings (after merge)
mysql-test/r/insert.result:
Updated tests
mysql-test/r/join_nested.result:
Updated results (because of new column types in 5.0)
mysql-test/r/lock_multi.result:
Temporarly wrong results until Sanja fixes multi-update-lock in 5.0
mysql-test/r/multi_update.result:
Temporary fix until Sanja fixes multi-update locking
mysql-test/r/ps_1general.result:
Update of results after merge
mysql-test/r/ps_2myisam.result:
Update of results after merge
mysql-test/r/ps_3innodb.result:
Update of results after merge
mysql-test/r/ps_4heap.result:
Update of results after merge
mysql-test/r/ps_5merge.result:
Update of results after merge
mysql-test/r/ps_6bdb.result:
Update of results after merge
mysql-test/r/query_cache.result:
Update of results after merge
mysql-test/r/range.result:
New results for new tests
mysql-test/r/rpl_auto_increment.result:
Update with new 4.0 information
mysql-test/r/rpl_charset.result:
After merge fixes
mysql-test/r/subselect.result:
After merge fixes
mysql-test/r/view.result:
Temporary fix until multi-update-locking is fixed
mysql-test/t/drop.test:
Safety fix
mysql-test/t/multi_update.test:
Temporary fix until multi-update-locking is fixed
mysql-test/t/rpl_charset.test:
More comments
mysql-test/t/sp-error.test:
Updated comments
mysql-test/t/view.test:
Temporary fix until multi-update-locking is fixed
scripts/mysql_fix_privilege_tables.sh:
Better error message
sql-common/client.c:
More debugging
sql/ha_ndbcluster.cc:
After merge fixes
sql/handler.cc:
After merge fixes
sql/item.cc:
Simple optimization of creating item
After merge fixed
Added Item_field::set_no_const_sub() to be able to mark fields that can't be substituted
The problem is that if you compare a string field to a binary string, you can't replace the field with a string constant as the binary comparison may then fail (The original field value may be in a different case)
sql/item.h:
Added Item::set_no_const_sub() to be able to mark fields that can't be substituted
sql/item_cmpfunc.cc:
Mark fields compared as binary to not be substituted.
sql/item_func.cc:
After merge fix
sql/log_event.cc:
After merge fix
sql/mysql_priv.h:
After merge fix
sql/opt_range.cc:
After merge fix
sql/protocol.cc:
Made flags uint instead of int (as it's used as a bit mask)
sql/protocol.h:
Made flags uint instead of int (as it's used as a bit mask)
sql/protocol_cursor.cc:
Made flags uint instead of int (as it's used as a bit mask)
Indentation cleanups
sql/sp.cc:
After merge fixes
Removed compiler warnings
sql/sp_head.cc:
After merge fixes
sql/sql_base.cc:
After merge fixes
Removed 'send_error' from 'insert_fields()' as the error is sent higher up
sql/sql_class.cc:
Give assert if set_n_backup_item_arena is used twice
sql/sql_class.h:
Give assert if set_n_backup_item_arena is used twice
After merge fixes
Added 'simple_select' method to be able to quickly determinate if a select_result is a normal SELECT
sql/sql_handler.cc:
After merge fixes
sql/sql_parse.cc:
After merge fixes
sql/sql_prepare.cc:
After merge fixes
sql/sql_select.cc:
After merge fixes
Moved 'build_equal_items' to optimize_cond() (logical place)
sql/sql_table.cc:
After merge fixes
sql/sql_trigger.cc:
After merge fixes
sql/sql_update.cc:
After merge fixes
(This should be fixed by Sanja to have lower granuality locking of tables in multi-update)
sql/sql_view.cc:
After merge fixes
sql/sql_yacc.yy:
After merge fixes
Don't have FOUND as a reserved keyword
FOUND is not a reserved keyword anymore
Added Item_field::set_no_const_sub() to be able to mark fields that can't be substituted
Added 'simple_select' method to be able to quickly determinate if a select_result is a normal SELECT
Note that the 5.0 tree is not yet up to date: Sanja will have to fix multi-update-locks for this merge to be complete
mysql-test/r/group_min_max.result:
Test results for BUG#6303
mysql-test/t/group_min_max.test:
Ucommented tests for BUG#6303
sql/opt_range.cc:
Comment fix
BitKeeper/etc/ignore:
auto-union
BitKeeper/etc/logging_ok:
auto-union
BitKeeper/triggers/post-commit:
Auto merged
Docs/Support/texi2html:
Auto merged
Makefile.am:
Auto merged
client/Makefile.am:
Auto merged
client/mysql.cc:
Auto merged
client/mysqldump.c:
Auto merged
include/my_base.h:
Auto merged
include/my_global.h:
Auto merged
include/my_pthread.h:
Auto merged
include/my_sys.h:
Auto merged
include/my_time.h:
Auto merged
include/mysql.h:
Auto merged
include/mysql_com.h:
Auto merged
innobase/buf/buf0buf.c:
Auto merged
innobase/include/row0mysql.h:
Auto merged
innobase/row/row0sel.c:
Auto merged
libmysql/libmysql.c:
Auto merged
libmysqld/examples/Makefile.am:
Auto merged
myisam/mi_check.c:
Auto merged
mysql-test/include/ps_modify.inc:
Auto merged
mysql-test/install_test_db.sh:
Auto merged
mysql-test/r/alter_table.result:
Auto merged
mysql-test/r/auto_increment.result:
Auto merged
mysql-test/r/bdb.result:
Auto merged
mysql-test/r/ctype_latin1_de.result:
Auto merged
mysql-test/r/ctype_recoding.result:
Auto merged
mysql-test/r/fulltext.result:
Auto merged
mysql-test/r/func_gconcat.result:
Auto merged
mysql-test/r/func_group.result:
Auto merged
mysql-test/r/func_if.result:
Auto merged
mysql-test/t/derived.test:
Auto merged
mysql-test/t/insert.test:
merge with 4.1
Fixed test case to not use 'if exists' when it shouldn't
mysql-test/t/range.test:
merge with 4.1
Added missing drop table
sql/ha_ndbcluster.cc:
merge with 4.1
Simple optimization: use max() instead of ? :
sql/item_func.cc:
merge with 4.1
(Added back old variable names for easier merges)
sql/opt_range.cc:
merge with 4.1
Removed argument 'parent_alloc' from QUICK_RANGE_SELECT as this was not used
Added assert if using QUICK_GROUP_MIN_MAX_SELECT with parent_alloc as the init() function can't handle this
Changed back get_quick_select_for_ref() to use it's own alloc root becasue this function may be called several times for one query
sql/sql_handler.cc:
merge with 4.1
change variable 'err' to 'error' as same function had a label named 'err'
sql/sql_update.cc:
Use multi-update code from 5.0 instead of 4.1
We will fix the locking code shortly in 5.0 to be faster than in 4.1
BitKeeper/etc/ignore:
Added stamp-h1.in stamp-h2.in to the ignore list
mysql-test/t/group_min_max.test:
- Added test for BUG#6303
- Added test for MIN/MAX optimizable queries with subqueries
sql/opt_range.cc:
- check_group_min_max_predicates should not be called when there is no MIN/MAX function
- skip queries from GROUP BY with MIN/MAX optimization when there is a subselect in the WHERE clause
COND_EQUAL must be derived from Sql_alloc to simplify memory
management for objects of this class.
This fixes a leak in mysql-test-run noticed by PEM.
opt_range.cc:
Fixed uninitialized min_max_range member the QUICK_GROUP_MIN_MAX_SELECT class.
sql/opt_range.cc:
Fixed uninitialized min_max_range member the QUICK_GROUP_MIN_MAX_SELECT class.
sql/item_cmpfunc.h:
COND_EQUAL must be derived from Sql_alloc to simplify memory
management for objects of this class.
This fixes a leak in mysql-test-run noticed by PEM.
COND_EQUAL must be derived from Sql_alloc to simplify memory
management for objects of this class.
This fixes a leak in mysql-test-run noticed by PEM.
opt_range.cc:
Fixed uninitialized min_max_range member the QUICK_GROUP_MIN_MAX_SELECT class.
into rurik.mysql.com:/home/igor/dev/mysql-5.0-0
mysql-test/r/innodb.result:
Auto merged
mysql-test/r/range.result:
Auto merged
mysql-test/t/range.test:
Auto merged
sql/opt_range.cc:
Auto merged
BitKeeper/etc/ignore:
auto-union
mysql-test/r/range.result:
Auto merged
mysql-test/r/select.result:
Auto merged
mysql-test/t/range.test:
Auto merged
sql/item.cc:
Auto merged
sql/opt_range.cc:
Auto merged
sql/opt_sum.cc:
Auto merged
sql/sql_select.h:
Auto merged
sql/item.h:
Manual merge
sql/sql_select.cc:
Manual merge
Added the code processing on expressions for applying
multiple equalities.
sql_select.cc:
Post-merge fixes for Item_equal patch.
Added the code processing on expressions for applying
multiple equalities.
Many files:
Post-merge fixes for Item_equal patch.
item_cmpfunc.cc:
Post-merge fixes for Item_equal patch.
Fixed a problem when an equality field=const cannot be applied to
the predicate P(field,c) for constant propagation as a conversion
of field is needed.
item.h, item.cc:
Fixed a problem when an equality field=const cannot be applied to
the predicate P(field,c) for constant propagation as a conversion
of field is needed.
mysql-test/r/func_test.result:
Post-merge fixes for Item_equal patch.
mysql-test/r/index_merge.result:
Post-merge fixes for Item_equal patch.
mysql-test/r/join_nested.result:
Post-merge fixes for Item_equal patch.
mysql-test/r/range.result:
Post-merge fixes for Item_equal patch.
sql/item.cc:
Fixed a problem when an equality field=const cannot be applied to
the predicate P(field,c) for constant propagation as a conversion
of field is needed.
sql/item.h:
Fixed a problem when an equality field=const cannot be applied to
the predicate P(field,c) for constant propagation as a conversion
of field is needed.
sql/item_cmpfunc.cc:
Post-merge fixes for Item_equal patch.
Fixed a problem when an equality field=const cannot be applied to
the predicate P(field,c) for constant propagation as a conversion
of field is needed.
sql/opt_range.cc:
Post-merge fixes for Item_equal patch.
sql/sql_select.cc:
Post-merge fixes for Item_equal patch.
Added the code processing on expressions for applying
multiple equalities.
sql/sql_select.h:
Added the code processing on expressions for applying
multiple equalities.
sql/table.h:
Added the code processing on expressions for applying
multiple equalities.
Added the code processing on expressions for applying
multiple equalities.
sql_select.cc:
Post-merge fixes for Item_equal patch.
Added the code processing on expressions for applying
multiple equalities.
Many files:
Post-merge fixes for Item_equal patch.
item_cmpfunc.cc:
Post-merge fixes for Item_equal patch.
Fixed a problem when an equality field=const cannot be applied to
the predicate P(field,c) for constant propagation as a conversion
of field is needed.
item.h, item.cc:
Fixed a problem when an equality field=const cannot be applied to
the predicate P(field,c) for constant propagation as a conversion
of field is needed.
test results corrected
mysql-test/r/range.result:
test results corrected
mysql-test/t/range.test:
test results corrected
sql/opt_range.cc:
compatibility fix
sql/opt_range.cc:
- Pulled code related to WL#1724 outside of #ifndef DBUG_OFF ... #endif which was put there incorrectly
- Moved all print procedures/method back into one place.
sql/ha_myisam.cc:
Auto merged
sql/handler.cc:
Auto merged
sql/item.cc:
Auto merged
sql/item.h:
Auto merged
sql/item_sum.cc:
Auto merged
sql/item_sum.h:
Auto merged
sql/key.cc:
Auto merged
sql/mysql_priv.h:
Auto merged
sql/opt_sum.cc:
Auto merged
sql/sql_acl.cc:
Auto merged
sql/sql_handler.cc:
Auto merged
sql/sql_insert.cc:
Auto merged
sql/sql_select.h:
Auto merged
sql/opt_range.cc:
Manual merge
sql/sql_select.cc:
Manual merge
sql/item.cc:
Document actual behavior.
sql/opt_range.cc:
- Added a test for range predicates comparing incomparable argumens
- Removed TRP_GROUP_MIN_MAX class members that are not used.
- Uncommented CPU cost
- More standard function return values
sql/sql_select.cc:
Remove unnecessary test.
prevent filling temporary tables of views on list fields command
sql/opt_range.cc:
debug output fixed
sql/sql_base.cc:
prevent substituting Item_ref as VIEW fields in WHERE conditions
sql/sql_parse.cc:
prevent filling temporary tables of views on list fields command
BitKeeper/etc/ignore:
auto-union
mysql-test/r/bdb.result:
Auto merged
mysql-test/r/func_group.result:
Auto merged
mysql-test/r/innodb.result:
Auto merged
mysql-test/r/heap_btree.result:
Auto merged
mysql-test/r/select.result:
Auto merged
mysql-test/r/user_var.result:
Auto merged
mysql-test/t/range.test:
Auto merged
sql/item_func.cc:
Auto merged
sql/item_func.h:
Auto merged
sql/item_row.cc:
Auto merged
sql/item_strfunc.h:
Auto merged
sql/opt_sum.cc:
Auto merged
sql/sql_list.h:
Auto merged
mysql-test/r/func_test.result:
Post-automerge resolution of conflicts
mysql-test/r/index_merge.result:
Post-automerge resolution of conflicts
mysql-test/r/join_outer.result:
Post-automerge resolution of conflicts
mysql-test/r/range.result:
Post-automerge resolution of conflicts
mysql-test/r/subselect.result:
Post-automerge resolution of conflicts
sql/item.cc:
Post-automerge resolution of conflicts
sql/item.h:
Post-automerge resolution of conflicts
sql/item_cmpfunc.cc:
Post-automerge resolution of conflicts
sql/item_cmpfunc.h:
Post-automerge resolution of conflicts
sql/opt_range.cc:
Post-automerge resolution of conflicts
sql/sql_select.cc:
Post-automerge resolution of conflicts
sql/sql_select.h:
Post-automerge resolution of conflicts
mysql-test/r/ndb_index_ordered.result:
Another test to check the use of "sorted" in combination with reset_bounds()
mysql-test/t/ndb_index_ordered.test:
Another test to check the use of "sorted" in combination with reset_bounds()
sql/ha_ndbcluster.cc:
Check that sorted is set to 0 or 1.
sql/opt_range.cc:
Initialise the sorted variable to zero QUICK_SELECT constructor.
Under strict mode MySQL will generate an error message if there was any conversion when assigning data to a field.
Added checking of date/datetime fields.
If strict mode, give error if we have not given value to field without a default value (for INSERT)
client/mysqltest.c:
Added --exit as an option to abort a test in a middle (good for debugging)
include/my_time.h:
Added flags to allow checking of dates in strict mode
include/mysql_com.h:
Added flag to check if field has a default value or not
include/mysqld_error.h:
New error messages for strict mode
include/sql_state.h:
Fixed SQL states (for strict mode tests)
mysql-test/r/auto_increment.result:
Updated error messages
mysql-test/r/func_sapdb.result:
Added test for ALLOW_INVALID_DATES
mysql-test/r/func_str.result:
Updated error messages
mysql-test/r/func_time.result:
Updated error messages
mysql-test/r/insert.result:
Updated error messages
mysql-test/r/loaddata.result:
Updated error messages
mysql-test/r/select.result:
Updated error messages
mysql-test/r/sp.result:
Updated error messages
mysql-test/r/timezone2.result:
Updated error messages
mysql-test/r/type_datetime.result:
Updated error messages
mysql-test/r/type_decimal.result:
Updated error messages
mysql-test/r/type_float.result:
Updated error messages
mysql-test/r/type_ranges.result:
Updated error messages
mysql-test/r/type_time.result:
Updated error messages
mysql-test/r/type_uint.result:
Updated error messages
mysql-test/r/warnings.result:
Updated error messages
mysql-test/t/func_sapdb.test:
Aded test
sql-common/my_time.c:
Added checking of dates
sql/field.cc:
Better error messages
Optimization of warning handling (by introducing of check_int())
Changed to use my_strtoll10()
sql/field.h:
Added check_int()
sql/item_func.cc:
Warnings when dividing by NULL
sql/item_func.h:
Warnings when dividing by NULL
sql/item_timefunc.cc:
Testing of date/datetime
Use macros instead of constants
sql/mysql_priv.h:
New modes (part of strict mode)
sql/mysqld.cc:
New modes (part of strict mode)
sql/opt_range.cc:
Simple optimizations
sql/protocol.cc:
Add note/warning level to find_handler()
sql/set_var.cc:
Added mode 'traditional'
sql/share/czech/errmsg.txt:
New error messages for strict mode
sql/share/danish/errmsg.txt:
New error messages for strict mode
sql/share/dutch/errmsg.txt:
New error messages for strict mode
sql/share/english/errmsg.txt:
New error messages for strict mode
sql/share/estonian/errmsg.txt:
New error messages for strict mode
sql/share/french/errmsg.txt:
New error messages for strict mode
sql/share/german/errmsg.txt:
New error messages for strict mode
sql/share/greek/errmsg.txt:
New error messages for strict mode
sql/share/hungarian/errmsg.txt:
New error messages for strict mode
sql/share/italian/errmsg.txt:
New error messages for strict mode
sql/share/japanese/errmsg.txt:
New error messages for strict mode
sql/share/korean/errmsg.txt:
New error messages for strict mode
sql/share/norwegian-ny/errmsg.txt:
New error messages for strict mode
sql/share/norwegian/errmsg.txt:
New error messages for strict mode
sql/share/polish/errmsg.txt:
New error messages for strict mode
sql/share/portuguese/errmsg.txt:
New error messages for strict mode
sql/share/romanian/errmsg.txt:
New error messages for strict mode
sql/share/russian/errmsg.txt:
New error messages for strict mode
sql/share/serbian/errmsg.txt:
New error messages for strict mode
sql/share/slovak/errmsg.txt:
New error messages for strict mode
sql/share/spanish/errmsg.txt:
New error messages for strict mode
sql/share/swedish/errmsg.txt:
New error messages for strict mode
sql/share/ukrainian/errmsg.txt:
New error messages for strict mode
sql/sp_rcontext.cc:
Add note/warning level to find_handler()
sql/sp_rcontext.h:
Add note/warning level to find_handler()
sql/sql_base.cc:
Fix bug for detecting crashed table
sql/sql_class.cc:
Variables for strct mode
sql/sql_class.h:
Variables for strct mode
sql/sql_error.cc:
In strict mode, convert warnings to errors
sql/sql_insert.cc:
Strict mode
If strict mode, give error if we have not given value to field without a default value
sql/sql_load.cc:
Strict mode
sql/sql_parse.cc:
Strict mode.
Add flag to field if it doesn't have a default value
sql/sql_select.cc:
Added comment
Prepare for upper level handling of table->status
sql/sql_union.cc:
Added THD to write_record()
sql/sql_update.cc:
Strict mode
sql/table.cc:
Handling of default values
sql/time.cc:
Checking of dates
Under strict mode MySQL will generate an error message if there was any conversion when assigning data to a field.
Added checking of date/datetime fields.
If strict mode, give error if we have not given value to field without a default value (for INSERT)
with memory roots in THD/Statement/Item_arena.
Added assertions preventing memory allocation on bzero'ed MEM_ROOT since it is worked by
pure luck and was very ineffective.
include/my_sys.h:
Reimplementation of Monty's optimization of clear_alloc_root().
Now clear_alloc_root() can be used only for detaching memory associated with MEM_ROOT
(e.g. to avoid its freeing). It can not be used for MEM_ROOT initialization any longer
(it was bad idea anyway since memory allocation on such MEM_ROOT was very ineffective
and worked by pure luck).
Introduced ALLOC_ROOT_MIN_BLOCK_SIZE constant.
mysys/my_alloc.c:
Added description of init_alloc_root().
Added assertions to alloc_root() and reset_root_defaults() so now they can only be used
on previosly initialized MEM_ROOT. (It worked for bzeroed MEM_ROOT before but
by pure luck and very inefficiently). Calling free_root() on bzero'ed MEM_ROOT
is still ok (we can't remove this easily because of static MEM_ROOTs).
Also now using ALLOC_ROOT_MIN_BLOCK_SIZE constant inside these functions.
sql/opt_range.cc:
Fixed get_quick_select_for_ref() function to not use bzero'ed MEM_ROOT for allocation.
Also QUICK_RANGEs created in this function should be created in memory root of QUICK_SELECT.
sql/sql_class.cc:
Implementation of Monty's idea about clear_alloc_root() optimization and cleanup of work
with memory roots in THD/Statement/Item_arena.
Now we are always initing THD::transaction.mem_root and THD::mem_root in THD constructor
(without memory allocation and with minimal block size) and then later change their
parameters in THD::init_for_queries() (this is partially because we can't allocate anything
on bzero'ed memory roots anymore).
Item_arena() constructor is now trivial and is used only then Item_arena is created as backup
storage for other Item_arena (we use Item_arena(bool) now if it is part of Statement).
Both trivial Item_arena constructor and destructor are now inline.
Removed unneeded clear_alloc_root from Item_arena::restore_backup_item_arena().
sql/sql_class.h:
Both trivial Item_arena constructor and destructor are now inline.
Commented various Item_arena constructors.
with memory roots in THD/Statement/Item_arena.
Added assertions preventing memory allocation on bzero'ed MEM_ROOT since it is worked by
pure luck and was very ineffective.
