57cab3e3a2
Problem: ======== When persistent statistics are enabled (innodb_stats_persistent=ON), the innodb_stats_method setting was not being properly passed through the statistics calculation chain. This caused NULL handling to always use the default behavior, regardless of the configured stats method. The issue affected query optimization for queries involving NULL values, as the statistics collection wasn't respecting the user's preference for NULL value treatment (NULLS_EQUAL, NULLS_UNEQUAL, or NULLS_IGNORED). Solution: ======== 1. Passed innodb_stats_method parameter through the statistics calculation chain: - dict_stats_scan_page() - dict_stats_analyze_index_below_cur() - dict_stats_analyze_index_for_n_prefix() - dict_stats_analyze_index_level - dict_stats_analyze_index - dict_stats_update_persistent - dict_stats_save 2. Conditionally set n_non_null_key_vals based on the NULLS_IGNORED method. 3. Introduced IndexLevelStats which is to collect statistics at a specific B-tree level during index analysis 4. Introduced LeafPageStats which is to collect statistics for leaf page analysis 5. IndexLevelStats, LeafPageStats replaces multiple individual parameters in function signatures. 6. Add stats method name to stat_description in case of non default innodb_stats_method variable value 7. When InnoDB scan the leaf page directly, assign leaf page count as number of pages scanned in case of multi-level index. For single page indexes, use 1. This change leads to multiple changes in existing test case. |
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| cmake | ||
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| debian | ||
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| extra | ||
| include | ||
| libmariadb@77bdf5a572 | ||
| libmysqld | ||
| libservices | ||
| man | ||
| mysql-test | ||
| mysys | ||
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| sql-common | ||
| storage | ||
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| wsrep-lib@14ce8cab76 | ||
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| CONTRIBUTING.md | ||
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| KNOWN_BUGS.txt | ||
| README.md | ||
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Code status:
ci.appveyor.com
MariaDB: The innovative open source 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/
Getting the code, building it and testing it
Refer to the following guide: https://mariadb.org/get-involved/getting-started-for-developers/get-code-build-test/ which outlines how to build the source code correctly and run the MariaDB testing framework, as well as which branch to target for your contributions.
Help
More help is available from the Maria Discuss mailing list https://lists.mariadb.org/postorius/lists/discuss.lists.mariadb.org/ and MariaDB's Zulip instance, https://mariadb.zulipchat.com/
Licensing
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