code: private Object executeColumn(SQL sql, Query qr, Column column, int row) throws PageException {
  	if (column.getColumn().equals("?")) {
  	    int pos = column.getColumnIndex();
  	    if (sql.getItems().length <= pos) throw new DatabaseException("invalid syntax for SQL Statement", null, sql, null);
  	    return sql.getItems()[pos].getValueForCF();
  	}
  	return column.getValue(qr, row);
  	// return qr.getAt(column.getColumn(),row);
      }
docs: Executes a constant value
  
  @param sql
  @param qr
  @param column
  @param row
  @return result
  @throws PageException