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https://dev.mysql.com/doc/internals/en/optimizer-index-merge-join-type.html
The current implementation builds SEL_IMERGE only if no single SEL_TREE object can be built for the part of the query condition it has analyzed, and discards SEL_TREE immediately if it discovers that a single SEL_TREE object can be constructed.
https://dev.mysql.com/doc/internals/en/tips-for-cmake-developers.html
How to find out which compiler/linker flags are used When using a Makefile generator, it is easy to examine which compiler flags are used to build. For example, compiler flags for mysqld are in sql/CMakeFiles/mysqld.dir/flags.make under the build ...What is CMakeCache.txt? CMake caches results of platform checks in ...
https://dev.mysql.com/doc/internals/en/cmake-howto-quick-debug-configuration.html
-DCMAKE_BUILD_TYPE=Debug make Windows (Visual Studio, from command line) mkdir bld_debug cd bld_debug cmake ..
https://dev.mysql.com/doc/internals/en/debug-only-options.html
Sometimes, it is handy to add an option that is active only in Debug builds. When doing this, keep in mind that tests like IF(WITH_DEBUG) or IF(CMAKE_BUILD_TYPE MATCHES "Debug") do not work as expected: First, although WITH_DEBUG is an alias for ...
https://dev.mysql.com/doc/internals/en/mysql-specific-cmake-macros.html
Example usage: MYSQL_ADD_EXECUTABLE(mysqld ${MYSQLD_SOURCE} \ DESTINATION ${INSTALL_SBINDIR}) MYSQL_ADD_PLUGIN: Build MySQL Plugin MYSQL_ADD_PLUGIN(plugin_name source1...sourceN [STORAGE_ENGINE] [MANDATORY|DEFAULT] [STATIC_ONLY|MODULE_ONLY] ...On ...
https://dev.mysql.com/doc/internals/en/config-directory.html
All the files in it have the extension .m4, which is a normal expectation of the GNU autoconf tool.
https://dev.mysql.com/doc/internals/en/error-message-adding.html
The procedure for adding error messages depends on which version of MySQL you are using: Before MySQL 5.0.3, error messages are stored in errmsg.txt files in the language directories under sql/share. That is, the files have names like ...
https://dev.mysql.com/doc/internals/en/guided-tour-flow.html
The flow works like this: First, the client routines get an SQL statement from a user, allowing edit, performing initial checks, and so on. Then, via the vio routines, the somewhat-massaged statement goes off to the server. Next, the sql routines ...
https://dev.mysql.com/doc/internals/en/libmysql-r-directory.html
There is only one file here, used to build a thread-safe libmysql library: makefile.am .
https://dev.mysql.com/doc/internals/en/optimizer-joins-access-methods.html
The cost of a plan reflects roughly the resources needed to compute a query according to the plan, where the main factor is the number of rows that will be accessed while computing a query. The optimizer first considers all plans for one table, then ... Bad join choices can cause more damage than bad choices in single-table searches, so MySQL developers have spent proportionally more time making sure that the tables in a query are joined in an optimal order and that optimal access methods (often called access paths) are chosen to retrieve table ...