15.9.5. Implementing the extra() Function
Prior to some operations, the
extra()
function is called to provide extra hints to the storage engine
on how to perform certain operations.
Implementation of the hints in the extra
call is not mandatory, and most storage engines return
0:
int ha_tina::extra(enum ha_extra_function operation)
{
DBUG_ENTER("ha_tina::extra");
DBUG_RETURN(0);
}
