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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. |
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| .. | ||
| collections | ||
| include | ||
| lib | ||
| main | ||
| std_data | ||
| suite | ||
| asan.supp | ||
| CMakeLists.txt | ||
| dgcov.pl | ||
| lsan.supp | ||
| mariadb-stress-test.pl | ||
| mariadb-test-run.pl | ||
| 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/