![]() Estimate_scan_time() calculates the cost of scanning a derivied table. The old code did not take into account that the temporary table heap table may be converted to Aria. Things fixed: - Added checking if the temporary tables data will fit in the heap. If not, then calculate the cost based on the designated internal temporary table engine (Aria). - Removed MY_MAX(records, 1000) and instead trust the optimizer's estimate of records. This reduces the cost of temporary tables a bit for small tables, which caused a few changes in mtr results. - Fixed cost calculation for HEAP. - HEAP costs->row_next_find_cost was not set. This does not affect old costs calculation as this cost slot was not used anywhere. Now HEAP cost->row_next_find_cost is set, which allowed me to remove some duplicated computation in ha_heap::scan_time() |
||
---|---|---|
.github | ||
BUILD | ||
client | ||
cmake | ||
dbug | ||
debian | ||
Docs | ||
extra | ||
include | ||
libmariadb@93e420621a | ||
libmysqld | ||
libservices | ||
man | ||
mysql-test | ||
mysys | ||
mysys_ssl | ||
plugin | ||
randgen/conf | ||
scripts | ||
sql | ||
sql-bench | ||
sql-common | ||
storage | ||
strings | ||
support-files | ||
tests | ||
tpool | ||
unittest | ||
vio | ||
win | ||
wsrep-lib@70cd967f5e | ||
zlib | ||
.clang-format | ||
.gitattributes | ||
.gitignore | ||
.gitlab-ci.yml | ||
.gitmodules | ||
appveyor.yml | ||
BUILD-CMAKE | ||
CMakeLists.txt | ||
CODING_STANDARDS.md | ||
config.h.cmake | ||
configure.cmake | ||
CONTRIBUTING.md | ||
COPYING | ||
CREDITS | ||
INSTALL-SOURCE | ||
INSTALL-WIN-SOURCE | ||
KNOWN_BUGS.txt | ||
README.md | ||
SECURITY.md | ||
THIRDPARTY | ||
VERSION |
Code status:
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 our security-policy.
The code for MariaDB, including all revision history, can be found at: https://github.com/MariaDB/server