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MariaDB server is a community developed fork of MySQL server. Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry.
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Instead of trying to open time zone tables during calculation of CONVERT_TZ() function or setting of @@time_zone variable we should open and lock them with the rest of statement's table (so we should add them to global table list) and after that use such pre-opened tables for loading info about time zones. mysql-test/r/timezone2.result: Added test for bug #4508 mysql-test/t/timezone2.test: Added test for bug #4508 scripts/mysql_create_system_tables.sh: Added one more test time zone to time zone tables which is needed for test for bug #4508. sql/item_create.cc: CONVERT_TZ() now is treated as special function. sql/item_create.h: CONVERT_TZ() now is treated as special function. sql/item_timefunc.cc: Item_func_convert_tz now uses list of pre-opened time zone tables instead of trying to open them ad-hoc. Also it avoid calling of current_thd. sql/item_timefunc.h: Added comment describing special nature of CONVERT_TZ() function. Optimization: Added own fix_fields() method and tz_tables member for caching pointer to list of open time zone tables to Item_func_convert_tz class. sql/lex.h: CONVERT_TZ() now is treated as special function. sql/mysql_priv.h: Removed function which is no longer used. sql/set_var.cc: Now my_tz_find() accepts list of pre-opened time zone tables as last argument and no longer needs pointer to current THD. sql/set_var.h: Exported sys_time_zone, which is now used in sql_yacc.yy for quick finding out if we are setting @@time_zone variable. sql/sql_base.cc: Moved propagation of pointers to open tables from global list to local select lists to open_and_lock_tables(), also added implicit usage of time zone tables as condition for such propagation. sql/sql_lex.cc: Added fake_time_zone_tables_list which is used to indicate that time zone tables are implicitly used in statement. st_select_lex_unit::create_total_list(): if time zone tables are implicitly used in statement add them to global tables list. sql/sql_lex.h: Added LEX::time_zone_tables_used member which is used to indicate that time zone tables are implicitly used in this statement (by pointing to fake_time_zone_table_list) and for holding pointer to those tables after they've been opened. sql/sql_parse.cc: We should also create global table list if statement uses time zone tables implicitly. Added initialization of LEX::time_zone_tables_used to mysql_query_init(). sql/sql_prepare.cc: We should also create global table list if statement uses time zone tables implicitly. sql/sql_select.cc: Removed functions which are no longer used. sql/sql_yacc.yy: CONVERT_TZ() and @@time_zone variable are handled in special way since they implicitly use time zone tables. sql/tztime.cc: Fix for bug #4508 "CONVERT_TZ() function with new time zone as param crashes server". If statement uses CONVERT_TZ() function or @@time_zone variable is set then it implicitly uses time zone tables. We need to open and lock such tables with all other tables of such statement. All code responsible for opening table was removed from tz_load_from_db() and function was renamed to tz_load_from_open_tables() (which uses list of pre-opened tables). We also have new functions for construction and initialization of table list of time zone tables. my_tz_find() now always require list of pre-opened time zone tables and no longer needs current THD. So we have to pre-open them in my_tz_init(). Also now we try to open time zone tables only if they were found during startup. sql/tztime.h: New function for construction of table list of time zone tables my_tz_get_table_list(). Now my_tz_find() requires list of pre-pened time zone tables instead of current thread. |
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| extra | ||
| heap | ||
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| innobase | ||
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| libmysql | ||
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| depcomp | ||
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| README | ||
This is a release of MySQL, a GPL (free) SQL database server (more licence information in the PUBLIC file and in the reference manual). Please read the "Upgrading from..." section in the manual first, if you are migrating from older versions of MySQL! The latest information about MySQL can be found at: http://www.mysql.com To see what it can do take a look at the features section in the manual. For installation instructions see the Installation chapter in the manual. For future plans see the TODO appendix in the manual. New features/bug fixes history is in the news appendix in the manual. For the currently known bugs/misfeatures (known errors) see the bugs appendix in the manual. For examples of SQL and benchmarking information see the bench directory. The manual mentioned above can be found in the Docs directory. The manual is available in the following formats: as plain ASCII text in Docs/manual.txt, in HTML format in Docs/manual_toc.html, as GNU Info in Docs/mysql.info and as PostScript in Docs/manual.ps. MySQL is brought to you by the MySQL team at MySQL AB For a list of developers and other contributors, see the Credits appendix in the manual. ************************************************************ IMPORTANT: Send bug (error) reports, questions and comments to the mailing list at mysql@lists.mysql.com Please use the 'mysqlbug' script when posting bug reports or questions about MySQL. mysqlbug will gather some information about your system and start your editor with a form in which you can describe your problem. Bug reports might be silently ignored by the MySQL maintainers if there is not a good reason included in the report as to why mysqlbug has not been used. A report that says 'MySQL does not work for me. Why?' is not considered a valid bug report. The mysqlbug script can be found in the 'scripts' directory of the distribution, that is '<where-you-installed-mysql>/scripts'.