code: public Object touch(int row) {
  	if (row < 1 || row > size) return NullSupportHelper.full() ? null : "";
  	Object o = data[row - 1];
  	if (o != null) return o;
  	return setEL(row, new StructImpl());
      }
docs: touch the given line on the column at given row
  
  @param row
  @return new row or existing
  @throws DatabaseException