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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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This is a performance bug, affecting in particular the bison generated code for the parser. Prior to this fix, the grammar used a long chain of reduces to parse an expression, like: bit_expr -> bit_term bit_term -> bit_factor bit_factor -> value_expr value_expr -> term term -> factor etc This chain of reduces cause the internal state automaton in the generated parser to execute more state transitions and more reduces, so that the generated MySQLParse() function would spend a lot of time looping to execute all the grammar reductions. With this patch, the grammar has been reorganized so that rules are more "flat", limiting the depth of reduces needed to parse <expr>. Tests have been written to enforce that relative priorities and properties of operators have not changed while changing the grammar. See the bug report for performance data. mysql-test/r/parser_precedence.result: Improved test coverage for operator precedence mysql-test/t/parser_precedence.test: Improved test coverage for operator precedence sql/sql_yacc.yy: Simplified the grammar to improve performances |
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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.