{# Displays 'Function' column if it is present #}
<td>
    {% set geom_types = get_gis_datatypes() %}
    {% if column_types[column_index] in geom_types %}
        <select class="geom_func" name="geom_func[{{ column_index }}]">
            {# get the relevant list of GIS functions #}
            {% set funcs = get_gis_functions(column_types[column_index], true, true) %}

            {% for func_name, func in funcs %}
                {% set name = func['display'] is defined ? func['display'] : func_name %}
                <option value="{{ name }}">
                    {{ name }}
                </option>
            {% endfor %}
        </select>
    {% else %}
        &nbsp;
    {% endif %}
</td>
