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result The IN function aggregates result types of all expressions. It uses that type in comparison of left expression and expressions in right part. This approach works in most cases. But let's consider the case when the right part contains both strings and integers. In that case this approach may cause wrong results because all strings which do not start with a digit are evaluated as 0. CASE uses the same approach when a CASE expression is given thus it's also affected. The idea behind this fix is to make IN function to compare expressions with different result types differently. For example a string in the left part will be compared as string with strings specified in right part and will be converted to real for comparison to int or real items in the right part. A new function called collect_cmp_types() is added. It collects different result types for comparison of first item in the provided list with each other item in the list. The Item_func_in class now can refer up to 5 cmp_item objects: 1 for each result type for comparison purposes. cmp_item objects are allocated according to found result types. The comparison of the left expression with any right part expression is now based only on result types of these expressions. The Item_func_case class is modified in the similar way when a CASE expression is specified. Now it can allocate up to 5 cmp_item objects to compare CASE expression with WHEN expressions of different types. The comparison of the CASE expression with any WHEN expression now based only on result types of these expressions.
This directory contains a test suite for the MySQL daemon. To run the currently existing test cases, simply execute ./mysql-test-run in this directory. It will fire up the newly built mysqld and test it. Note that you do not have to have to do "make install", and you could actually have a co-existing MySQL installation. The tests will not conflict with it. All tests must pass. If one or more of them fail on your system, please read the following manual section for instructions on how to report the problem: http://dev.mysql.com/doc/mysql/en/mysql-test-suite.html 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, the test suite expects you to provide the 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 alias analyze To match your setup, you might also need to provide --socket, --user, and other relevant options. With no test cases named on the command line, mysql-test-run falls back to the normal "non-extern" behavior. The reason for this is that some tests cannot run with an external server. You can create your own test cases. To create a test case, create a new file in the t 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. We would appreciate it if you name your test tables t1, t2, t3 ... (to not conflict too much with existing tables). 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 (like result file names) 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 cases consisting of SQL statements and comments, you can create the test case 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 --record-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. To submit your test case, 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://support.mysql.com/pub/mysql/secret/ and send a mail to bugs@lists.mysql.com