51c61f1655
Problem:
========
After MDEV-39261, purge opens a MariaDB TABLE handle (via
ha_innobase::open()) to compute indexed virtual columns.
ha_innobase::open() skips statistics initialization for
background threads, by design due to commit
9739cf1859 (MDEV-25664)
When purge is done with the table, it is closed and goes back into
the shared table cache. The table cache can later hand this
very same object to a replication thread. On that reuse,
MariaDB does not call ha_innobase::open() again, so the table
statistics never get a second chance to be initialized.
Next DML on that table aborts the server saying table
statistics was not initialized.
Solution:
========
ha_innobase::external_lock(): When the lock is being acquired
and the caller is not a background thread, check if the
table's statistics are still uninitialized, and if so, initialize the
table statistics. This runs once per table per statement, so it
catches the gap regardless of whether the TABLE object came
from a fresh open() or was reused from the table cache.
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/docs/release-notes
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