opt_range.cc:

    }

    else

    {

      /* Heikki changed Sept 11, 2002: since InnoDB does not store the cursor

	 position if READ_KEY_EXACT is used to a primary key with all

	 key columns specified, we must use below HA_READ_KEY_OR_NEXT,

	 so that InnoDB stores the cursor position and is able to move

	 the cursor one step backward after the search. */

      DBUG_ASSERT(range->flag & NEAR_MAX || range_reads_after_key(range));

      /* Note: even if max_key is only a prefix, HA_READ_AFTER_KEY will

       * do the right thing - go past all keys which match the prefix */

      result=file->index_read(record, (byte*) range->max_key,

			      range->max_length,

			      ((range->flag & NEAR_MAX) ?

			       HA_READ_KEY_EXACT : HA_READ_AFTER_KEY));

			       HA_READ_KEY_OR_NEXT : HA_READ_AFTER_KEY));

      result = file->index_prev(record);

    }

    if (result)