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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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UNIQUE (eq-ref) lookups result in table being considered as a "constant" table. Queries that consist of only constant tables are processed in do_select() in a special way that doesn't invoke evaluate_join_record(), and therefore doesn't increase the counters join->examined_rows and join->thd->row_count. The patch increases these counters in this special case. NOTICE: This behavior seems to contradict what the documentation says in Sect. 5.11.4: "Queries handled by the query cache are not added to the slow query log, nor are queries that would not benefit from the presence of an index because the table has zero rows or one row." No test case in 5.0 as issue shows only in slow query log, and other counters can give subtly different values (with regard to counting in create_sort_index(), synthetic rows in ROLLUP, etc.). |
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| BUILD | ||
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| dbug | ||
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| extra | ||
| heap | ||
| include | ||
| innobase | ||
| libmysql | ||
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| mysql-test | ||
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| netware | ||
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| pstack | ||
| regex | ||
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| sql | ||
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| sql-common | ||
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| strings | ||
| support-files | ||
| tests | ||
| tools | ||
| VC++Files | ||
| vio | ||
| win | ||
| zlib | ||
| .bzrignore | ||
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| CMakeLists.txt | ||
| configure.in | ||
| COPYING | ||
| EXCEPTIONS-CLIENT | ||
| Makefile.am | ||
| 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.