MariaDB-server/mysql-test
Sergei Petrunia 50ee5d1b3f MDEV-38426: Clustered PK not used for Loose Index Scan optimization
Loose Index Scan optimization can only be used when the index it is
uses covers all columns used by the query. So, it would not be
attempted for indexes that are not present in table->covering_keys.

Before commit ed0a723566 (pushed to 11.0), Clustered PK would be
present in table->covering_keys if primary key columns are covering.

However, that commit gave Clustered PKs special treatment: they are
no longer present in table->covering_keys. This caused Loose Scan not
to be considered for Clustered PKs.

Fixed this by making the check in get_best_group_min_max() to allow
Loose Scan if all fields used by the query are parts of the Clustered PK.

Also made changes:
- The logic in JOIN_TAB::save_explain_data() assumed that Loose Scan
  could only be used for index-only scans. This is not the case for
  clustered PKs.
- One query in group_min_max_innodb started to use Loose Scan. It did so
  in 10.11, too.
2025-12-27 16:41:08 +02:00
..
collections MDEV-37600 Backpoint MDEV-9804 Implement a caching_sha2_password plugin 2025-09-21 13:13:30 +02:00
include MDEV-37600 Backpoint MDEV-9804 Implement a caching_sha2_password plugin 2025-09-21 13:13:30 +02:00
lib Merge 10.11 into 11.4 2025-09-24 13:40:09 +03:00
main MDEV-38426: Clustered PK not used for Loose Index Scan optimization 2025-12-27 16:41:08 +02:00
std_data
suite MDEV-38164: Fix the estimates reported by TABLE::key_storage_length() 2025-12-02 10:54:31 +02:00
asan.supp
CMakeLists.txt
dgcov.pl
lsan.supp
mariadb-stress-test.pl
mariadb-test-run.pl Merge 10.11 into 11.4 2025-09-03 10:32:56 +03:00
mtr.out-of-source
purify.supp
README
README-gcov
README.stress
suite.pm
valgrind.supp

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 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/