mariadb/mysql-test
Yuchen Pei b3e70bde38
MDEV-36055 Allow left join reordering
This is done by no longer merging inner table dep with outer
nested_join ones.

This expands the search space of outer joins and introduces suboptimal
join order choices already existing in inner joins (e.g. MDEV-36331,
MDEV-37346) to outer joins, caused by heuristic pruning.

To mitigate this issue, we add a switch that turns on heuristic
pruning always (existing behaviour), and make is so that when the
switch is off (default) joins with limited number of tables or limited
search space* do not perform heuristic pruning. This improves join
order optimization for these joins, where otherwise heuristic pruning
may remove good joins - see added test cases in the test
main.greedy_optimizer.

*: about the same as 10 tables with default search depth (7) when
optimizer_search_depth=0.

If we completely disable heuristic pruning, or use the upper bound
10!, the test main.greedy_optimizer will grind to almost hanging for
optimizer_search_depth=0 when more than 20 tables are involved.

If we only compare the number of tables with 10, then it will prune
when search space is low due to a low search depth when we can afford
not to prune.
2025-08-14 18:00:53 +10:00
..
collections MDEV-9804 Implement a caching_sha2_password plugin 2025-07-27 13:57:06 +02:00
include MDEV-36055 Allow left join reordering 2025-08-14 18:00:53 +10:00
lib Merge branch '11.8' into 12.0 2025-05-22 09:22:55 +02:00
main MDEV-36055 Allow left join reordering 2025-08-14 18:00:53 +10:00
std_data Merge branch '11.8' into 12.0 2025-06-18 07:50:39 +02:00
suite MDEV-36055 Allow left join reordering 2025-08-14 18:00:53 +10:00
asan.supp
CMakeLists.txt Merge branch '10.5' into 10.6 2025-03-31 12:12:50 +02:00
dgcov.pl
lsan.supp
mariadb-stress-test.pl Fix typos in mysql-test/ 2025-04-29 13:53:16 +10:00
mariadb-test-run.pl Merge branch '11.8' into 12.0 2025-07-31 20:55:47 +02:00
mtr.out-of-source
purify.supp
README
README-gcov
README.stress
suite.pm
valgrind.supp Fix typos in mysql-test/ 2025-04-29 13:53:16 +10:00

This directory contains test suites for the MariaDB server. To run
currently existing test cases, execute ./mysql-test-run in this directory.

Some tests are known to fail on some platforms or be otherwise unreliable.
In the file collections/smoke_test there is a list of tests that are
expected to be stable.

In general you do not have to do "make install", and you can have
a co-existing MariaDB installation, the tests will not conflict with it.
To run the tests in a source directory, you must do "make" first.

In Red Hat distributions, you should run the script as user "mysql".
The user is created with nologin shell, so the best bet is something like
  # su -
  # cd /usr/share/mariadb-test
  # su -s /bin/bash mysql -c ./mysql-test-run

This will use the installed MariaDB executables, but will run a private
copy of the server process (using data files within /usr/share/mariadb-test),
so you need not start the mysqld service beforehand.

You can omit --skip-test-list option if you want to check whether
the listed failures occur for you.

To clean up afterwards, remove the created "var" subdirectory, e.g.
  # su -s /bin/bash - mysql -c "rm -rf /usr/share/mariadb-test/var"

If tests fail on your system, please read the following manual section
for instructions on how to report the problem:

https://mariadb.com/kb/en/reporting-bugs

If you want to use an already running MySQL server for specific tests,
use the --extern option to mysql-test-run. Please note that in this mode,
you are expected to provide names of the tests to run.

For example, here is the command to run the "alias" and "analyze" tests
with an external server:

  # mariadb-test-run --extern socket=/tmp/mysql.sock alias analyze

To match your setup, you might need to provide other relevant options.

With no test names on the command line, mysql-test-run will attempt
to execute the default set of tests, which will certainly fail, because
many tests cannot run with an external server (they need to control the
options with which the server is started, restart the server during
execution, etc.)

You can create your own test cases. To create a test case, create a new
file in the main subdirectory using a text editor. The file should have a .test
extension. For example:

  # xemacs t/test_case_name.test

In the file, put a set of SQL statements that create some tables,
load test data, and run some queries to manipulate it.

Your test should begin by dropping the tables you are going to create and
end by dropping them again. This ensures that you can run the test over
and over again.

If you are using mysqltest commands in your test case, you should create
the result file as follows:

  # mariadb-test-run --record test_case_name

  or

  # mariadb-test --record < t/test_case_name.test

If you only have a simple test case consisting of SQL statements and
comments, you can create the result file in one of the following ways:

  # mariadb-test-run --record test_case_name

  # mariadb test < t/test_case_name.test > r/test_case_name.result

  # mariadb-test --record --database test --result-file=r/test_case_name.result < t/test_case_name.test

When this is done, take a look at r/test_case_name.result.
If the result is incorrect, you have found a bug. In this case, you should
edit the test result to the correct results so that we can verify that
the bug is corrected in future releases.

If you want to submit your test case you can send it
to developers@lists.mariadb.org or attach it to a bug report on
http://mariadb.org/jira/.

If the test case is really big or if it contains 'not public' data,
then put your .test file and .result file(s) into a tar.gz archive,
add a README that explains the problem, ftp the archive to
ftp://ftp.mariadb.org/private and submit a report to
https://mariadb.org/jira about it.

The latest information about mysql-test-run can be found at:
https://mariadb.com/kb/en/mariadb/mysqltest/

If you want to create .rdiff files, check
https://mariadb.com/kb/en/mariadb/mysql-test-auxiliary-files/