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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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6020281e95
Date field was declared as not null, thus expression 'datefield is null' was always false. For SELECT special handling of such cases is used. There 'datefield is null' converted to 'datefield eq "0000-00-00"'. In mysql_update() before creation of select added remove_eq_conds() call. It makes some optimization of conds and in particular performs conversion from 'is null' to 'eq'. Also remove_eq_conds() makes some evaluation of conds and if it founds that conds is always false then update statement is not processed further. All this allows to perform some update statements process faster due to optimized conds, and not wasting resources if conds known to be false. sql/sql_select.cc: Fix bug#14186 select datefield is null not updated Remove static from remove_eq_conds() sql/sql_select.h: Fix bug#14186 select datefield is null not updated Added remove_eq_conds() prototype. mysql-test/r/update.result: Test case for bug#14186 select datefield is null not updated mysql-test/t/update.test: Test case for bug#14186 select datefield is null not updated sql/sql_update.cc: Fix bug#14186 select datefield is null not updated To mysql_update() added call to remove_eq_conds() to optimize conds and convert 'datefield is null' to 'datefield eq 0000-00-00' |
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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.