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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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A date can be represented as an int (like 20060101) and as a string (like "2006.01.01"). When a DATE/TIME field is compared in one SELECT against both representations the constant propagation mechanism leads to comparison of DATE as a string and DATE as an int. In this example it compares 2006 and 20060101 integers. Obviously it fails comparison although they represents the same date. Now the Item_bool_func2::fix_length_and_dec() function sets the comparison context for items being compared. I.e. if items compared as strings the comparison context is STRING. The constant propagation mechanism now doesn't mix items used in different comparison contexts. The context check is done in the Item_field::equal_fields_propagator() and in the change_cond_ref_to_const() functions. Also the better fix for bug 21159 is introduced. mysql-test/t/type_datetime.test: Added a test case for bug#21475: Wrongly applied constant propagation leads to a false comparison. mysql-test/r/type_datetime.result: Added a test case for bug#21475: Wrongly applied constant propagation leads to a false comparison. sql/sql_select.cc: Fixed bug#21475: Wrongly applied constant propagation leads to a false comparison. The constant propagation mechanism now doesn't mix items used in different comparison contexts. The check is done in the change_cond_ref_to_const() function. sql/item_cmpfunc.cc: Fixed bug#21475: Wrongly applied constant propagation leads to a false comparison. Now the Item_bool_func2::fix_length_and_dec() function sets the comparison context for items being compared. sql/item.h: Fixed bug#21475: Wrongly applied constant propagation leads to a false comparison. To the Item class a new field called cmp_context is added. It represents the comparison context of an item. sql/item.cc: Fixed bug#21475: Wrongly applied constant propagation leads to a false comparison. The constant propagation mechanism now doesn't mix items used in different comparison contexts. The context check is done in the Item_field::equal_fields_propagator() function. |
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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. - 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.