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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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The Item_func_concat::val_str() function tries to make as less re-allocations as possible. This results in appending strings returned by 2nd and next arguments to the string returned by 1st argument if the buffer for the first argument has enough free space. A constant subselect is evaluated only once and its result is stored in an Item_cache_str. In the case when the first argument of the concat() function is such a subselect Item_cache_str returns the stored value and Item_func_concat::val_str() append values of other arguments to it. But for the next row the value in the Item_cache_str isn't restored because the subselect is a constant one and it isn't evaluated second time. This results in appending string values of 2nd and next arguments to the result of the previous Item_func_concat::val_str() call. The Item_func_concat::val_str() function now checks whether the first argument is a constant one and if so it doesn't append values of 2nd and next arguments to the string value returned by it. mysql-test/t/func_concat.test: Added test case for bug#16716: subselect in concat() may lead to a wrong result. mysql-test/r/func_concat.result: Added test case for bug#16716: subselect in concat() may lead to a wrong result. sql/item_strfunc.cc: Fixed bug#16716: subselect in concat() may lead to a wrong result. The Item_func_concat::val_str() function now checks whether the first argument is a constant one and if so it doesn't append values of 2nd and next arguments to the string value returned by it. |
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| extra | ||
| heap | ||
| include | ||
| innobase | ||
| isam | ||
| libmysql | ||
| libmysql_r | ||
| libmysqld | ||
| man | ||
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| mysql-test | ||
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| ndb | ||
| netware | ||
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| pstack | ||
| regex | ||
| scripts | ||
| sql | ||
| sql-bench | ||
| sql-common | ||
| SSL | ||
| strings | ||
| support-files | ||
| tests | ||
| tools | ||
| VC++Files | ||
| vio | ||
| zlib | ||
| .bzrignore | ||
| .cvsignore | ||
| acinclude.m4 | ||
| config.guess | ||
| config.sub | ||
| configure.in | ||
| COPYING | ||
| depcomp | ||
| install-sh | ||
| ltconfig | ||
| ltmain.sh | ||
| Makefile.am | ||
| missing | ||
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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 MySQL AB. License information can be found in these files: - For GPL (free) distributions, see the COPYING file. - For commercial distributions, see the MySQLEULA.txt file. 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 Installation chapter. - For future plans, see the TODO appendix. - For the new features/bugfix history, see the News appendix. - For the currently known bugs/misfeatures (known errors) see the problems 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.