mariadb/mysql-test
Rex 7d46ee3336 MDEV-35673 Item_subselect::used_tables_cache issues with outer references and optimization.
This split from MDEV-32294, discovered when inspecting how
Item_subselect::used_tables_cache gets recalculated during 1st and 2nd
executions of prepared statements.

We build a list of outer references resolved against each select_lex.
This list is not reset at the end of a prepared statement, so each
element in this must be allocated on statement memory. Because of this
we rely on MDEV-30073, as prior to this patch, some outer references are
freed at the end of prepared statement execution.  We use this list to
recalculate Item_subselect::used_tables_cache

There are a number of additional processing steps that need to happen
during query merges.  A derived table merge will leave a mix of
SELECT_LEX::nest_base_level pointers in our query structure.  Some
Item::*processors will search for items that 'belong' only to the 'unit'
being searched.  We need to update this and nest_level when merging.

We update SELECT_LEX::outer_references_resolved_here, in case an Item in
a subquery is no longer an outer reference.

We introduce a number tests in main.outer_reference, along with a way of
wrapping each select to be executed in a number of different ways.
TODO, check that the result of each of these different ways of execution
is identical.  We could wrap this into client/mysqltest and perhaps
allow stacking of each execution method, such as --view (to create a
view from our test statement and then select from the view) and --ps (to
prepare our test statement, now selecting from a view, and compare data
output from first and second executions).

Name resolution fixes related to prepared statement execution.

We no longer call fix_outer_field after the first execution, we now
rely on the attribute depended_from, populated during the first execution.
Code is added to Item_field::fix_fields to compensate.

We allocate view field substituions on statement memory.  When run as a
prepared statement, this happens during the first execution.

table_map fixes related to prepared statement and view processing.

In setup_fields, during the 2nd execution of a prepared statement, we
can call used_tables() prior to any caches being set up.  This can
result in incorrect processing.

We also ban execution of EXPLAIN EXTENDED statements during mtr ps
protocol runs as the generation of warnings varies due to the fact that
some Item select_transformers cannot be run during execution of the
prepare statement, so we would normally expect a different warning
output.
2025-06-05 18:11:31 +11:00
..
collections
include Merge 10.6 into 10.11 2025-03-27 08:01:47 +02:00
lib MDEV-33671: Remove hardcoded open-files-limit in safe_process.cc 2025-04-15 18:07:43 +03:00
main MDEV-35673 Item_subselect::used_tables_cache issues with outer references and optimization. 2025-06-05 18:11:31 +11:00
std_data Merge 10.6 into 10.11 2025-05-21 07:36:35 +03:00
suite MDEV-35673 Item_subselect::used_tables_cache issues with outer references and optimization. 2025-06-05 18:11:31 +11:00
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
mariadb-test-run.pl MDEV-33671: Remove hardcoded open-files-limit in safe_process.cc 2025-04-15 18:07:43 +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/mysql-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/mysql-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/mysql-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:

  # mysql-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:

  # mysql-test-run --record test_case_name

  or

  # mysqltest --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:

  # mysql-test-run --record test_case_name

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

  # mysqltest --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/