code: private String fixValue( final int column,
                               final String value ) {
          String _value = value;
          final FieldType fieldType = this.fieldTypes.get( column );
          if ( fieldType == FieldType.NORMAL_FIELD || !isMultipleConstraints() || isForAll() ) {
              return value;
          }
          if ( isDelimitedString( _value ) ) {
              _value = _value.substring( 1,
                                         _value.length() - 1 );
          }
          return _value;
      }
docs: If the type of the column is either FieldType.SINGLE_FIELD or FieldType.OPERATOR_FIELD we have
  added quotation-marks around the template parameter. Consequentially if a cell value included the
  quotation-marks (i.e. for an empty-string or white-space) we need to remove the additional
  quotation-marks.
  @param value
  @return