5e4aa1a2f8
Currently condition pushdown into materialized views / derived tables is not implemented yet (see mdev-12387) and grouping views are optimized early when subqueries are converted to semi-joins in convert_join_subqueries_to_semijoins(). If a subquery that is converted to a semi-join uses a grouping view this view is optimized in two phases. For such a view V only the first phase of optimization is done after the conversion of subqueries of the outer join into semi-joins. At the same time the reference of the view V appears in the join expression of the outer join. In fixed code there was an attempt to push conditions into this view and to optimize it after this. This triggered the second phase of the optimization of the view and it was done prematurely. The second phase of the optimization for the materialized view is supposed to be called after the splitting condition is pushed into the view in the call of JOIN::improve_chosen_plan for the outer join. The fix blocks the attempt to push conditions into splittable views if they have been already partly optimized and the following optimization for them. The test case of the patch shows that the code for mdev-13369 basically supported the splitting technique for materialized views / derived tables. The patch also replaces the name of the state JOIN::OPTIMIZATION_IN_STAGE_2 for JOIN::OPTIMIZATION_PHASE_1_DONE and fixes a bug in TABLE_LIST::fetch_number_of_rows() |
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| client | ||
| cmake | ||
| dbug | ||
| debian | ||
| Docs | ||
| extra | ||
| include | ||
| libmariadb@11321f16bf | ||
| libmysqld | ||
| libservices | ||
| man | ||
| mysql-test | ||
| mysys | ||
| mysys_ssl | ||
| pcre | ||
| plugin | ||
| randgen/conf | ||
| scripts | ||
| sql | ||
| sql-bench | ||
| sql-common | ||
| storage | ||
| strings | ||
| support-files | ||
| tests | ||
| unittest | ||
| vio | ||
| win | ||
| wsrep | ||
| zlib | ||
| .gitattributes | ||
| .gitignore | ||
| .gitmodules | ||
| .travis.compiler.sh | ||
| .travis.yml | ||
| BUILD-CMAKE | ||
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| config.h.cmake | ||
| configure.cmake | ||
| COPYING | ||
| COPYING.thirdparty | ||
| CREDITS | ||
| EXCEPTIONS-CLIENT | ||
| INSTALL-SOURCE | ||
| INSTALL-WIN-SOURCE | ||
| KNOWN_BUGS.txt | ||
| README.md | ||
| VERSION | ||
MariaDB: drop-in replacement for MySQL
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 CREDITS file 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 the MariaDB Foundation and the MariaDB Corporation, 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 run '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.
Help:
More help is available from the Maria Discuss mailing list https://launchpad.net/~maria-discuss and the #maria IRC channel on Freenode.
License:
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.
Bug Reports:
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
Code status:
travis-ci.org (10.2 branch)