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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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The problem was caused by the following scenario: - range optimizer picks an index IDX1 which doesn't match the ORDER BY ... LIMIT clause. - test_if_skip_sort_order() decides to switch to index IDX2 which matches the ORDER BY ... LIMIT. - it runs SQL_SELECT::test_quick_select() for the second time to produce an quick select for IDX2. - However, test_quick_select() would figure that full index scan on IDX1 is still cheaper (its calculations ignore the LIMIT n). Fixed this by - passing force_quick_range=true to test_quick_select() - in test_quick_select, don't consider full index scans if the mentioned parameter is true. Numerous changes in .result files are caused by test_quick_select() being run after "early/late NULLs filtering" feature has injected NOT NULL condition. |
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| client | ||
| cmake | ||
| cmd-line-utils | ||
| dbug | ||
| debian | ||
| Docs | ||
| extra | ||
| include | ||
| libmysql | ||
| libmysqld | ||
| libservices | ||
| man | ||
| mysql-test | ||
| mysys | ||
| mysys_ssl | ||
| packaging | ||
| pcre | ||
| plugin | ||
| randgen/conf | ||
| scripts | ||
| sql | ||
| sql-bench | ||
| sql-common | ||
| storage | ||
| strings | ||
| support-files | ||
| tests | ||
| unittest | ||
| vio | ||
| win | ||
| wsrep | ||
| zlib | ||
| .bzrignore | ||
| .gitattributes | ||
| .gitignore | ||
| BUILD-CMAKE | ||
| CMakeLists.txt | ||
| config.h.cmake | ||
| configure.cmake | ||
| COPYING | ||
| COPYING.LESSER | ||
| COPYING.thirdparty | ||
| CREDITS | ||
| EXCEPTIONS-CLIENT | ||
| INSTALL-SOURCE | ||
| INSTALL-WIN-SOURCE | ||
| KNOWN_BUGS.txt | ||
| README | ||
| VERSION | ||
MariaDB is designed as a drop-in replacement of MySQL(R) with more features, new storage engines, fewer bugs, and better performance. MariaDB is brought to you by the MariaDB foundation. Please read the file CREDITS for details about the MariaDB foundation, and who is developing MariaDB. MariaDB is developed by many of the original developers of MySQL who now work for MariadB foundation and SkySQL Ab, and by many people in the community. MySQL, which is the base of MariaDB, is a product and trademark of Oracle Corporation, Inc. For a list of developers and other contributors, see the Credits appendix. You can also do 'SHOW authors' to get a list of active contributors. A description of the MariaDB project and a manual can be found at: http://mariadb.org/ https://mariadb.com/kb/en/ https://mariadb.com/kb/en/mariadb-vs-mysql-features/ https://mariadb.com/kb/en/mariadb-versus-mysql-features/ https://mariadb.com/kb/en/mariadb-versus-mysql-compatibility/ As MariaDB is a full replacement of MySQL, the MySQL manual at http://dev.mysql.com/doc is generally applicable. More help is available from the Maria Discuss mailing list https://launchpad.net/~maria-discuss and the #maria IRC channel on Freenode. *************************************************************************** NOTE: MariaDB is specifically available only under version 2 of the GNU General Public License (GPLv2). (I.e. Without the "any later version" clause.) This is inherited from MySQL. Please see the README file in the MySQL distribution for more information. License information can be found in the COPYING, COPYING.LESSER, and COPYING.thirdparty files. *************************************************************************** IMPORTANT: Bug and/or error reports regarding MariaDB should be submitted at http://mariadb.org/jira Bugs in the MySQL code can also be submitted at http://bugs.mysql.com The code for MariaDB, including all revision history, can be found at: https://github.com/MariaDB/server ***************************************************************************