code: @Override
  	public boolean next() {
  		while (true) {
  			if (rp.next())
  				return true;
  			if (current == endBlkNum)
  				return false;
  			moveToBlock(current + 1);
  		}
  	}
docs: Moves to the next record in the current block of the chunk. If there are
  no more records, then make the next block be current. If there are no
  more blocks in the chunk, return false.
  
  @see Scan#next()