e7bf8bca2f
This bug was a regression caused by MDEV-12698. On non-leaf pages, the delete-mark flag in the node pointer records is basically garbage. (Delete-marking only makes sense at the leaf level anyway. The purpose of the delete-mark is to tell MVCC, locking and purge that a leaf-level record does not exist in the READ UNCOMMITTED view, but it used to exist.) Node pointer records and non-leaf pages are glue that attaches multiple leaf pages to an index. This glue is supposed to be transparent to the transactional layer. When a page is split, InnoDB creates a node pointer record out of the child page record that the cursor is positioned on. The node pointer record for the parent page will be a copy of the child page record, amended with the child page number. If the child page record happened to carry the delete-mark flag, then the node pointer record would also carry this flag (even though the flag makes no sense outside child pages). (On a related note, for the first node pointer record in the first node pointer page of each tree level, if the MIN_REC_FLAG is set, the rest of the record contents (except the child page number) is basically garbage. From this garbage you could deduce at which point the child was originally split.) page_scan_method_t: Replace with bool, as there are only 2 values. dict_stats_scan_page(): Replace the parameter scan_method with is_leaf. Ignore the bogus (garbage) delete-mark flag if !is_leaf.
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)