code: public boolean getBoolean(int index)
    {
      Object value = _values[index - 1];
  
      if (value instanceof Boolean) {
        return (Boolean) value;
      }
      else {
        return Boolean.valueOf(value.toString());
      }
    }
docs: Returns the column as a boolean.
  
  @param index 1-based
  @return column as a boolean