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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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To avoid unnecessary work the mysql_alter_table function takes the list of table fields and applies all changes to it (drops/moves/renames/etc). Then this function compares the new list and the old one. If the changes require only .frm to be modified then the actual data isn't copied. To detect changes all columns attributes but names are compared. When a column has been moved and has replaced another column with the same attributes except name the mysql_alter_table function wrongly decides that two fields has been just renamed. As a result the data from the moved column and from all columns after it is not copied. Now the mysql_alter_table function forces table data copying by setting the need_copy_table flag when it finds a moved column. The flag is set at the stage when the modified fields are created. |
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| libmysql | ||
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| COPYING | ||
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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 and the EXCEPTIONS-CLIENT file. - For commercial distributions, see the LICENSE.mysql 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 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.