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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-info-method.html
Prior to commencing a table scan, the [custom-engine.html#custom-engine-api-reference-info info()] method is called to provide extra table information to the optimizer. The information required by the optimizer is not given through return values ...
https://dev.mysql.com/doc/internals/en/implementing-position-method.html
The [custom-engine.html#custom-engine-api-reference-position position()] method is called after every call to rnd_next() if the data needs to be reordered: void ha_foo::position(const byte *record) It stores a "position" of a record in this->ref.
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-next-method.html
After the table is initialized, the MySQL server will call the handler's [custom-engine.html#custom-engine-api-reference-rnd_next rnd_next()] method once for every row to be scanned until the server's search condition is satisfied or an end of file ...
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 ...
https://dev.mysql.com/doc/internals/en/implementing-rollback.html
Of the two major transactional operations, ROLLBACK is the more complicated to implement. All operations that occurred during the transaction must be reversed so that all rows are unchanged from before the transaction began. To support ROLLBACK, ...
https://dev.mysql.com/doc/internals/en/implementing-store-lock-method.html
The [custom-engine.html#custom-engine-api-reference-store_lock store_lock()] method is called before any reading or writing is performed. Before adding the lock into the table lock handler mysqld calls store lock with the requested locks. Store ...