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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/event-header-fields.html
The value of this constant is 13 in MySQL 3.23 (v1 format), and 19 in MySQL 4.0 and up (v3 format and up). The first 19 bytes for v4 are the same as those for v3. Because the event header in a newer binary log format starts with the header of the ...
https://dev.mysql.com/doc/internals/en/extra.html
Purpose Passes hints from the server to the storage engine. Synopsis virtual int extra ( operation); enum ha_extra_function operation ; Description This is the extra method. extra() is called whenever the server wishes to send a hint to the storage ...
https://dev.mysql.com/doc/internals/en/getting-source-tree.html
This section describes how to obtain the MySQL source tree, which is currently available on GitHub. For more information about MySQL's move to GitHub, refer to the announcement on the MySQL Release Engineering blog: MySQL on GitHub To obtain the ...
https://dev.mysql.com/doc/internals/en/gnu-debugger.html
Once you've got something that runs, you can put a debugger on it. We recommend use of the GNU debugger http://www.gnu.org/software/gdb/documentation/ And many developers use the graphical debugger tool DDD - Data Display Debugger ...
https://dev.mysql.com/doc/internals/en/implementing-index-next-method.html
The [custom-engine.html#custom-engine-api-reference-index_next index_next()] method is used for index scanning: int ha_foo::index_next(byte * buf) The *buf parameter is populated with the row that corresponds to the next matching key value ...
https://dev.mysql.com/doc/internals/en/implementing-index-prev-method.html
The [custom-engine.html#custom-engine-api-reference-index_prev index_prev()] method is used for reverse index scanning: int ha_foo::index_prev(byte * buf) The *buf parameter is populated with the row that corresponds to the previous matching key ...
https://dev.mysql.com/doc/internals/en/implementing-records-in-range-method.html
The [custom-engine.html#custom-engine-api-reference-records_in_range records_in_range()] method is called by the optimizer to assist in choosing which index on a table to use for a query or join. It is defined as follows: ha_rows ...
https://dev.mysql.com/doc/internals/en/implementing-rnd-init-method.html
The method called before any table scan is the [custom-engine.html#custom-engine-api-reference-rnd_init rnd_init()] method. The rnd_init() method is used to prepare for a table scan, resetting counters and pointers to the start of the table. The ...
https://dev.mysql.com/doc/internals/en/implementing-rnd-pos-method.html
The [custom-engine.html#custom-engine-api-reference-rnd_pos rnd_pos()] method behaves in a similar fashion to the rnd_next() method but takes an additional parameter: int ha_foo::rnd_pos(byte * buf, byte *pos) The *pos parameter contains ...