90ba999e80
(addressed review input) The issue was introduced by @@optimizer_max_sel_arg_weight code. key_or() calls SEL_ARG::update_weight_locally(). That function takes O(tree->elements) time. Without that call, key_or(big_tree, one_element_tree) would take O(log(big_tree)) when one_element_tree doesn't overlap with elements of big_tree. This means, update_weight_locally() can cause a big slowdown. The fix: 1. key_or() actually doesn't need to call update_weight_locally(). It calls SEL_ARG::tree_delete() and SEL_ARG::insert(). These functions update SEL_ARG::weight. It also manipulates the SEL_ARG objects directly, but these modifications do not change the weight of the tree. I've just removed the update_weight_locally() call. 2. and_all_keys() also calls update_weight_locally(). It manipulates the SEL_ARG graph directly. Removed that call and added the code to update the SEL_ARG graph weight. Tests main.range and main.range_not_embedded already contain the queries that have test coverage for the affected code. |
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Code status:
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MariaDB: The open source relational database
MariaDB was 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 and the MariaDB Corporation. 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 Corporation, the MariaDB Foundation 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:
https://mariadb.com/kb/en/mariadb-vs-mysql-features/
https://mariadb.com/kb/en/mariadb-versus-mysql-compatibility/
https://mariadb.com/kb/en/new-and-old-releases/
Help
More help is available from the Maria Discuss mailing list https://launchpad.net/~maria-discuss, MariaDB's Zulip instance, https://mariadb.zulipchat.com/
Live QA for beginner contributors
MariaDB has a dedicated time each week when we answer new contributor questions live on Zulip. From 8:00 to 10:00 UTC on Mondays, and 10:00 to 12:00 UTC on Thursdays, anyone can ask any questions they’d like, and a live developer will be available to assist.
New contributors can ask questions any time, but we will provide immediate feedback during that interval.
Licensing
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 file. Third party license information can be found in the THIRDPARTY file.
Bug Reports
Bug and/or error reports regarding MariaDB should be submitted at: https://jira.mariadb.org
For reporting security vulnerabilities see: https://mariadb.org/about/security-policy/
The code for MariaDB, including all revision history, can be found at: https://github.com/MariaDB/server