mariadb/mysql-test
Rex 942e4e0506 MDEV-30073 Wrong result on 2nd execution of PS for query with NOT EXISTS
This bug is consequence of a serious architectural flaw of the query
processing at the prepare stage. Context analysis of processed queries has
to be done at this stage. The important part of this analysis is resolution
of column references also known as name resolution. The items for column
references used in a query are created by the parser. They are allocated
in the statement memory because their life span is the same as the life
span of the executed query. During name resolution some of the items are
wrapped into objects belonging to classes derived from the Item_ref class.
In many cases we can't do without such wrappers. For example, the parser
does not differentiate between references to columns of base tables and
references to columns of views. However for a reference to a view column
we need a pointer to the translation item for this column. This pointer
is stored in a Item_direct_view_ref object that wraps the item for the
column reference. Before this patch the wrappers were allocated in
execution memory good only for one execution. That wasn't a problem when
the query was executed only once. Yet for the queries executed as prepared
statements or within a stored procedure it could lead to crashes or wrong
result sets at the second execution of the query. It could happen when
the wrapped item was substituted for something else by permanent
transformations during the optimization phase.

This patch allocates all the wrappers around items created for column
references in the statement memory at the first execution of PS or at the
first call of SP/SF.
2025-03-25 12:52:05 +12:00
..
collections
include MDEV-35748 : Attempting to create a CONNECT engine Table results in non-InnoDB sequences in Galera cluster error 2025-02-01 16:53:39 +01:00
lib Merge branch '10.5' into 10.6 2025-01-29 11:17:38 +01:00
main MDEV-30073 Wrong result on 2nd execution of PS for query with NOT EXISTS 2025-03-25 12:52:05 +12:00
std_data Merge 10.6 into 10.11 2025-01-08 12:51:26 +02:00
suite MDEV-30073 Wrong result on 2nd execution of PS for query with NOT EXISTS 2025-03-25 12:52:05 +12:00
asan.supp
CMakeLists.txt
dgcov.pl
lsan.supp
mariadb-stress-test.pl
mariadb-test-run.pl Extended mariadb-test-run to define MARIADB_TOPDIR and MARIADB_DATADIR 2025-02-25 16:52:54 +02:00
mtr.out-of-source
purify.supp
README
README-gcov
README.stress
suite.pm Merge 10.6 into 10.11 2024-10-03 10:55:08 +03:00
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/