start_and_number_of_rows_panel.twig

<fieldset>
    <div>
        <label for="pos">{% trans "Start row:" %}</label>
        <input type="number" name="pos" min="0" required="required"
            {% if unlim_num_rows > 0 -%}
                max="{{ unlim_num_rows - 1 }}"
            {%- endif %}
            value="{{ pos }}" />

        <label for="session_max_rows">{% trans "Number of rows:" %}</label>
        <input type="number" name="session_max_rows" min="1"
               value="{{ rows }}" required="required" />
        <input type="submit" name="submit" class="Go"
               value="{% trans "Go" %}" />
        <input type="hidden" name="sql_query"
               value="{{ sql_query }}" />
        <input type="hidden" name="unlim_num_rows"
               value="{{ unlim_num_rows }}" />
    </div>
</fieldset>