InnoDB maps HA_READ_PREFIX_LAST_OR_PREV to PAGE_CUR_LE, but note that only complete-field prefixes of the kay value can be used as the search key


sql/ha_innodb.cc:
  InnoDB maps HA_READ_PREFIX_LAST_OR_PREV to PAGE_CUR_LE, but note that only complete-field prefixes of the kay value can be used as the search key