code: @Override
      public QOr appendSQL(final SQLSelect _sql)
          throws EFapsException
      {
          _sql.addPart(SQLPart.PARENTHESIS_OPEN);
          boolean first = true;
          for (final AbstractQPart part : getParts()) {
              if (first) {
                  first = false;
              } else {
                  _sql.addPart(SQLPart.OR);
              }
              part.appendSQL(_sql);
          }
          _sql.addPart(SQLPart.PARENTHESIS_CLOSE);
          return this;
      }
docs: {@inheritDoc}