Bug #15684: @@version_* are not all SELECTable
Added the appropriate information as read-only system variables, and
also removed some special-case handling of @@version along the way.
@@version_bdb was added, but isn't included in the test because it
depends on the presence of BDB.
The table opening process now works the following way:
- Create common TABLE_SHARE object
- Read the .frm file and unpack it into the TABLE_SHARE object
- Create a TABLE object based on the information in the TABLE_SHARE
object and open a handler to the table object
Other noteworthy changes:
- In TABLE_SHARE the most common strings are now LEX_STRING's
- Better error message when table is not found
- Variable table_cache is now renamed 'table_open_cache'
- New variable 'table_definition_cache' that is the number of table defintions that will be cached
- strxnmov() calls are now fixed to avoid overflows
- strxnmov() will now always add one end \0 to result
- engine objects are now created with a TABLE_SHARE object instead of a TABLE object.
- After creating a field object one must call field->init(table) before using it
- For a busy system this change will give you:
- Less memory usage for table object
- Faster opening of tables (if it's has been in use or is in table definition cache)
- Allow you to cache many table definitions objects
- Faster drop of table
Variable character_set_system is selectable now
More accurate error message results during
update of character_set_system and some other read only variables
character_set_results is nullable, but value_ptr returns string "NULL"
set_var.cc:
Create Item_null instead of Item_string for NULL values
variables.result, variables.test:
adding test case
Change bool in C code to my_bool
Added to mysqltest --enable_parsning and --disable_parsing to avoid to have to comment parts of tests
Added comparison of LEX_STRING's and use this to compare file types for view and trigger files.
set_var.cc:
variables.result
variables.test
Bug #10904 Illegal mix of collations between a system variable and a constant
Changing coercibility of system variables to SYSCONST,
to be the same with USER(), DATABASE(), etc.
myisam_max_extra_sort_file_size is depricated
Ensure that myisam_data_pointer_size is honoured when creating new MyISAM files
Changed default value of myisam_data_pointer_size from 4 to 6 to get rid of 'table-is-full' errors
BUG#9738 "SHOW VARIABLES still displays the deprecated 'log_update' in 5.0",
BUG#9542 "MySQL dies with signal 11 when it is using non-existent location of binary logs"
