code: @Override
      public AbstractQPart appendSQL(final SQLSelect _sql)
      {
          if (this.ignoreCase) {
              _sql.addPart(SQLPart.UPPER).addPart(SQLPart.PARENTHESIS_OPEN);
          }
          _sql.addColumnPart(this.tableIndex, this.attribute.getSqlColNames().get(0));
          if (this.ignoreCase) {
              _sql.addPart(SQLPart.PARENTHESIS_CLOSE);
          }
          return this;
      }
docs: {@inheritDoc}