}

    @Test
    public void test_parseExtraQueries_null() {
        setupViewHelperWithFacetGroups();
        final MockHttpServletRequest request = new MockHttpServletRequest();
        // ex_q not set (null)
        final String[] result = chatApiManager.parseExtraQueries(request);
        assertEquals(0, result.length);
    }

    @Test
    public void test_parseExtraQueries_empty() {

					<c:forEach var="countEntry" items="${fieldData.valueCountMap}">
						<c:if test="${countEntry.value != 0 && fe:labelexists(countEntry.key)}">
							<li class="list-group-item"><la:link
									href="/search?q=${f:u(q)}&ex_q=label%3a${f:u(countEntry.key)}&sdh=${f:u(fe:sdh(sdh))}${fe:pagingQuery(null)}${fe:facetQuery()}${fe:geoQuery()}">
										${f:h(fe:label(countEntry.key))}

					<c:forEach var="countEntry" items="${fieldData.valueCountMap}">
						<c:if test="${countEntry.value != 0 && fe:labelexists(countEntry.key)}">
							<li class="list-group-item"><la:link
									href="/search?q=${f:u(q)}&ex_q=label%3a${f:u(countEntry.key)}&sdh=${f:u(fe:sdh(sdh))}${fe:pagingQuery(null)}${fe:facetQuery()}${fe:geoQuery()}">
										${f:h(fe:label(countEntry.key))}

    /** The extra queries. */
    public String[] ex_q;

    /** The similar document hash. */
    public String sdh;

    @Override
    public String getQuery() {
        return q;
    }

    @Override
    public String[] getExtraQueries() {
        return stream(ex_q).get(stream -> stream.filter(StringUtil::isNotBlank).distinct().toArray(n -> new String[n]));
    }

    /**
     * Array of language codes to filter search results.
     */
    public String[] lang;

    /**
     * Array of additional query strings to exclude from search.
     */
    public String[] ex_q;

    /**
     * The starting position for search results pagination.
     */
    @ValidateTypeFailure
    public Integer start;

    /**
     * The offset for search results.
     */

            var isChecked = checkbox.prop('checked');

            if (filterType === 'label') {
                setFilter(state.filters.labels, filterValue, isChecked);
            } else if (filterType === 'ex_q') {
                setFilter(state.filters.extraQueries, filterValue, isChecked);
            }

            updateGroupBadge(checkbox.closest('.dropdown'));
            updateFilterBadge();
        });

        final List<String> pagingQueryList = new ArrayList<>();
        if (form.ex_q != null) {
            stream(form.ex_q).of(stream -> stream.filter(StringUtil::isNotBlank)
                    .distinct()
                    .forEach(q -> pagingQueryList.add("ex_q=" + LaFunctions.u(q))));
        }
        if (StringUtil.isNotBlank(form.sort)) {

    <function-class>org.codelibs.fess.taglib.FessFunctions</function-class>
    <function-signature>java.lang.String pagingQuery(java.lang.String)</function-signature>
    <example>
      ${fe:pagingQuery("ex_q=timestamp:")}
    </example>
  </function>

  <function>
    <description>
      Returns query parameters for Facet.
    </description>
    <name>facetQuery</name>

											<c:forEach var="queryEntry" items="${facetQueryView.queryMap}">
											<label class="filter-check-item">
												<input type="checkbox" class="filter-check" data-filter-type="ex_q" data-filter-value="${f:h(queryEntry.value)}" />

											<c:forEach var="queryEntry" items="${facetQueryView.queryMap}">
											<label class="filter-check-item">
												<input type="checkbox" class="filter-check" data-filter-type="ex_q" data-filter-value="${f:h(queryEntry.value)}" />