MariaDB server is a community developed fork of MySQL server. Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry.
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Monty 04ef45cb5b Adding option to tell that cmp_ref handler call is expensive
- In Spider, calling cmp_ref() can be very expensive. In ha_partition.cc
  we don't anymore sort rows according to position for the Spider
  engine.
- Removed Spider specific call info(HA_EXTRA_STARTING_ORDERED_INDEX_SCAN)
  from handle_ordered_index_scan(). It's caused performance issues and
  does not change results for queries with ORDER BY.
- The visible effect of this patch is that for some storage engines,
  rows may be returned in a different order if there is no ORDER BY clause.

- Based in Spiral Patch 052:
  052_mariadb-10.2.0.add_partition_skip_pk_sort_for_non_clustered_index.diff
  MDEV-7748
- The major difference from original patch is that there is no variable to
  get the old behaviour.

- Other things:
  - Optimized ha_partition::cmp_ref() and cmp_part_ids() to make them
    simpler and faster.
  - Changed arguments to cmp_key_part_id() to be same as cmp_key_rowid_part_id
    to simplify code.

Original author: Kentoku SHIBA
First reviewer:  Jacob Mathew
Second reviewer: Michael Widenius
2017-09-28 16:39:43 +03:00
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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:

  • tests status travis-ci.org (10.2 branch)