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MariaDB server is a community developed fork of MySQL server. Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry.
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and HAVING When calculating GROUP BY the server caches some expressions. It does that by allocating a string slot (Item_copy_string) and assigning the value of the expression to it. This effectively means that the result type of the expression can be changed from whatever it was to a string. As this substitution takes place after the compile-time result type calculation for IN but before the run-time type calculations, it causes the type calculations in the IN function done at run time to get unexpected results different from what was prepared at compile time. In the CASE ... WHEN ... THEN ... statement there was a similar problem and it was solved by artificially adding a STRING argument to the matrix at compile time, so if any of the arguments of the CASE function changes its type to a string it will still be covered by the information prepared at compile time. Extended the CASE fix for cover the IN case. An alternative way of fixing this problem is by caching the result type of the arguments at compile time and using the cached information at run time instead of re-calculating the result types. Preferred the CASE approach for uniformity and fix localization. mysql-test/r/func_in.result: Bug #44399: test case mysql-test/t/func_in.test: Bug #44399: test case sql/item_cmpfunc.cc: Bug #44399: assume at compile time there's an extra string argument in the IN function (similar to CASE) to cater for possible string conversions in the process of calculating the GROUP BY/aggregates. |
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| README | ||
This is a release of MySQL, a dual-license SQL database server. MySQL is brought to you by the MySQL team at Sun Microsystems, Inc. License information can be found in these files: - For GPL (free) distributions, see the COPYING file and the EXCEPTIONS-CLIENT file. - For commercial distributions, see the LICENSE.mysql file. GPLv2 Disclaimer For the avoidance of doubt, except that if any license choice other than GPL or LGPL is available it will apply instead, Sun elects to use only the General Public License version 2 (GPLv2) at this time for any software where a choice of GPL license versions is made available with the language indicating that GPLv2 or any later version may be used, or where a choice of which version of the GPL is applied is otherwise unspecified. For further information about MySQL or additional documentation, see: - The latest information about MySQL: http://www.mysql.com - The current MySQL documentation: http://dev.mysql.com/doc Some manual sections of special interest: - If you are migrating from an older version of MySQL, please read the "Upgrading from..." section first! - To see what MySQL can do, take a look at the features section. - For installation instructions, see the Installing and Upgrading chapter. - For the new features/bugfix history, see the Change History appendix. - For the currently known bugs/misfeatures (known errors) see the Problems and Common Errors appendix. - For a list of developers and other contributors, see the Credits appendix. A local copy of the MySQL Reference Manual can be found in the Docs directory in GNU Info format. You can also browse the manual online or download it in any of several formats at the URL given earlier in this file. ************************************************************ IMPORTANT: Bug or error reports should be sent to http://bugs.mysql.com.