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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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UNION could convert fixed-point FLOAT(M,D)/DOUBLE(M,D) columns to FLOAT/DOUBLE when aggregating data types from the SELECT substatements. While there is nothing particularly wrong with this behavior, especially when M is greater than the hardware precision limits, it could be confusing in cases when all SELECT statements in a union have the same FLOAT(M,D)/DOUBLE(M,D) columns with equal precision specifications listed in the same position. Since the manual is quite vague on what data type should be returned in such cases, the bug was fixed by implementing the most 'expected' behavior: do not convert FLOAT(M,D)/DOUBLE(M,D) to anything else if all SELECT statements in a UNION have the same precision for that column. mysql-test/r/union.result: Added a test case for bug #43432. mysql-test/t/union.test: Added a test case for bug #43432. sql/field.cc: Replaced FLT_DIG+6 and DBL_DIG+7 with a symbolic constant. sql/item.cc: Do not convert FLOAT(M,D)/DOUBLE(M,D) to anything else if all SELECT statements in a UNION have the same precision for that column. sql/mysql_priv.h: Added a symbolic constant for FLT_DIG+6 and DBL_DIG+7. |
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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.