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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 optimization that uses a unique index to remove GROUP BY, did not ensure that the index was actually used, thus violating the ORDER BY that is impled by GROUP BY. Fixed by replacing GROUP BY with ORDER BY if the GROUP BY clause contains a unique index. In case GROUP BY ... ORDER BY null is used, GROUP BY is simply removed. BitKeeper/etc/ignore: Added support-files/mysqld_multi.server tests/bug25714 cscope.in.out cscope.out cscope.po.out to the ignore list mysql-test/r/distinct.result: Bug#30596: Changed test case. Prior to Bug#16458, These queries use temp table and filesort. The bug was that they used a temp table. However, that patch removed filesort also, in which case we can no longer gurantee correct ordering. mysql-test/r/group_by.result: Bug#30596: Correct result mysql-test/r/innodb_mysql.result: Bug#30596: Test case for innodb. Here, as opposed to for MyISAM, row lookup is done using index whenever the index covers the group list. mysql-test/t/group_by.test: Bug#30596: Test case mysql-test/t/innodb_mysql.test: Bug#30596: Test case sql/sql_select.cc: Bug#30596: The fix, replacing GROUP BY with ORDER BY unless ORDER BY [NULL|<constant>] |
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This is a release of MySQL, a dual-license SQL database server. MySQL is brought to you by the MySQL team at MySQL AB. License information can be found in these files: - For GPL (free) distributions, see the COPYING file and the EXCEPTIONS-CLIENT file. - For commercial distributions, see the LICENSE.mysql file. For further information about MySQL or additional documentation, see: - The latest information about MySQL: http://www.mysql.com - The current MySQL documentation: http://dev.mysql.com/doc Some manual sections of special interest: - If you are migrating from an older version of MySQL, please read the "Upgrading from..." section first! - To see what MySQL can do, take a look at the features section. - For installation instructions, see the Installing and Upgrading chapter. - For the new features/bugfix history, see the Change History appendix. - For the currently known bugs/misfeatures (known errors) see the Problems and Common Errors appendix. - For a list of developers and other contributors, see the Credits appendix. A local copy of the MySQL Reference Manual can be found in the Docs directory in GNU Info format. You can also browse the manual online or download it in any of several formats at the URL given earlier in this file. ************************************************************ IMPORTANT: Bug or error reports should be sent to http://bugs.mysql.com.