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https://dev.mysql.com/doc/internals/en/full-text-search.html
MySQL uses Ranking with Vector Spaces for ordinary full-text queries. Rank, also known as relevance rank, also known as relevance measure, is a number that tells us how good a match is. Vector Space, which MySQL sometimes calls "natural language", ...
https://dev.mysql.com/doc/internals/en/guided-tour-chunk.html
Now, having finished with our bird's eye view of the source code from the air, let's take the perspective of the worms on the ground (which is another name for MySQL's developer staff -- turn on laugh track here). if (updated && (error <= 0 || ...
https://dev.mysql.com/doc/internals/en/implementing-savepoint-release-method.html
The savepoint_release() method is called whenever a user issues the RELEASE SAVEPOINT statement: int (*savepoint_release) (THD *thd, void *sv); The *sv parameter points to the storage area that was previously passed to the savepoint_set() method.
https://dev.mysql.com/doc/internals/en/implementing-savepoint-rollback-method.html
The savepoint_rollback() method is called whenever a user issues the ROLLBACK TO SAVEPOINT statement: int (*savepoint_rollback) (THD *thd, void *sv); The *sv parameter points to the storage area that was previously passed to the savepoint_set() ...
https://dev.mysql.com/doc/internals/en/implementing-savepoint-set-method.html
The savepoint_set() method is called whenever a user issues the SAVEPOINT statement: int (*savepoint_set)(THD *thd, void *sv); The *sv parameter points to an uninitialized storage area of the size defined by savepoint_offset. When savepoint_set() ...
https://dev.mysql.com/doc/internals/en/index-end.html
Purpose Indicates end of index scan, clean up any resources used. Synopsis virtual int index_end ( ); ; Description This is the index_end method. Generally it is used as a counterpart to the index_init method, cleaning up any resources allocated for ...
https://dev.mysql.com/doc/internals/en/index-first.html
Synopsis virtual int index_first ( buf); byte * buf ; Description This is the index_first method.
https://dev.mysql.com/doc/internals/en/index-init.html
Purpose Signals the storage engine that an index scan is about to occur. Synopsis virtual int index_init ( idx, sorted); uint idx ; bool sorted ; Description This is the index_init method. This method is called before an index scan, allowing the ...
https://dev.mysql.com/doc/internals/en/index-last.html
Synopsis virtual int index_last ( buf); byte * buf ; Description This is the index_last method. Parameters buf - byte array to be populated with matching row. Usage Advance to last row in index and return row in buffer.
https://dev.mysql.com/doc/internals/en/index-next.html
Synopsis virtual int index_next ( buf); byte * buf ; Description This is the index_next method. Usage Advance to next row in index using pointer or cursor, return row in buffer.