/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.solr;

import static org.hamcrest.CoreMatchers.containsString;

import java.io.IOException;
import java.util.List;
import org.apache.solr.SolrTestCaseJ4.SuppressPointFields;
import org.apache.solr.client.solrj.SolrClient;
import org.apache.solr.client.solrj.SolrServerException;
import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.common.SolrDocumentList;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.params.CommonParams;
import org.apache.solr.common.params.ModifiableSolrParams;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.common.util.NamedList;
import org.hamcrest.MatcherAssert;
import org.junit.Test;

/**
 * TODO? perhaps use: http://docs.codehaus.org/display/JETTY/ServletTester rather then open a real
 * connection?
 *
 * @since solr 4.0
 */
@SuppressPointFields(bugUrl = "https://issues.apache.org/jira/browse/SOLR-10844")
public class TestDistributedGrouping extends BaseDistributedSearchTestCase {

  public TestDistributedGrouping() {
    // SOLR-10844: Even with points suppressed, this test breaks if we (randomize) docvalues="true"
    // on trie fields?!?!?!!?
    System.setProperty(NUMERIC_DOCVALUES_SYSPROP, "false");
  }

  String t1 = "a_t";
  String i1dv = "a_idv";
  String i1 = "a_i1";
  String s1 = "a_s";
  String s1dv = "a_s_dvo";
  String b1dv = "a_b_dvo";
  String tlong = "other_tl1";
  String tdate_a = "a_n_tdt1"; // use single-valued date field
  String tdate_b = "b_n_tdt1";
  String oddField = "oddField_s1";

  @Test
  @SuppressWarnings({"unchecked"})
  public void test() throws Exception {
    del("*:*");
    commit();

    handle.clear();
    handle.put("timestamp", SKIPVAL);
    handle.put("_version_", SKIP);
    // distrib grouping doesn't guarantee order of top level group commands
    handle.put("grouped", UNORDERED);

    // Test distributed grouping with empty indices
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc");
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc",
        "hl",
        "true",
        "hl.fl",
        t1);
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc",
        "facet",
        "true",
        "facet.field",
        t1);
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc",
        "stats",
        "true",
        "stats.field",
        i1);
    query(
        "q",
        "kings",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc",
        "spellcheck",
        "true",
        "spellcheck.build",
        "true",
        "qt",
        "spellCheckCompRH",
        "df",
        "subject");
    query(
        "q",
        "*:*",
        "fq",
        s1 + ":a",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc",
        "group.truncate",
        "true",
        "facet",
        "true",
        "facet.field",
        t1);

    indexr(
        id,
        1,
        i1,
        100,
        tlong,
        100,
        i1dv,
        100,
        t1,
        "now is the time for all good men",
        tdate_a,
        "2010-04-20T11:00:00Z",
        b1dv,
        true,
        tdate_b,
        "2009-08-20T11:00:00Z",
        s1dv,
        "Trillian",
        "foo_f",
        1.414f,
        "foo_b",
        "true",
        "foo_d",
        1.414d);
    indexr(
        id,
        2,
        i1,
        50,
        tlong,
        50,
        i1dv,
        50,
        t1,
        "to come to the aid of their country.",
        tdate_a,
        "2010-05-02T11:00:00Z",
        b1dv,
        false,
        tdate_b,
        "2009-11-02T11:00:00Z");
    indexr(id, 3, i1, 2, tlong, 2, t1, "how now brown cow", tdate_a, "2010-05-03T11:00:00Z");
    indexr(
        id,
        4,
        i1,
        -100,
        tlong,
        101,
        i1dv,
        101,
        t1,
        "the quick fox jumped over the lazy dog",
        b1dv,
        true,
        s1dv,
        "Zaphod",
        tdate_a,
        "2010-05-03T11:00:00Z",
        tdate_b,
        "2010-05-03T11:00:00Z");
    indexr(
        id,
        5,
        i1,
        500,
        tlong,
        500,
        i1dv,
        500,
        t1,
        "the quick fox jumped way over the lazy dog",
        tdate_a,
        "2010-05-05T11:00:00Z");
    indexr(id, 6, i1, -600, tlong, 600, i1dv, 600, t1, "humpty dumpy sat on a wall");
    indexr(id, 7, i1, 123, tlong, 123, i1dv, 123, t1, "humpty dumpy had a great fall");
    indexr(
        id,
        8,
        i1,
        876,
        tlong,
        876,
        tdate_b,
        "2010-01-05T11:00:00Z",
        t1,
        "all the kings horses and all the kings men");
    indexr(id, 9, i1, 7, tlong, 7, i1dv, 7, t1, "couldn't put humpty together again");
    indexr(id, 10, i1, 4321, tlong, 4321, i1dv, 4321, t1, "this too shall pass");
    indexr(
        id,
        11,
        i1,
        -987,
        tlong,
        987,
        i1dv,
        2015,
        t1,
        "An eye for eye only ends up making the whole world blind.");
    indexr(
        id,
        12,
        i1,
        379,
        tlong,
        379,
        i1dv,
        379,
        t1,
        "Great works are performed, not by strength, but by perseverance.");

    indexr(
        id,
        14,
        "SubjectTerms_mfacet",
        new String[] {"mathematical models", "mathematical analysis"});
    indexr(id, 15, "SubjectTerms_mfacet", new String[] {"test 1", "test 2", "test3"});
    indexr(id, 16, "SubjectTerms_mfacet", new String[] {"test 1", "test 2", "test3"});
    String[] vals = new String[100];
    for (int i = 0; i < 100; i++) {
      vals[i] = "test " + i;
    }
    indexr(id, 17, "SubjectTerms_mfacet", vals);

    indexr(
        id,
        18,
        i1,
        232,
        tlong,
        332,
        i1dv,
        150,
        t1,
        "no eggs on wall, lesson learned",
        b1dv,
        true,
        s1dv,
        "dent",
        oddField,
        "odd man out");
    indexr(
        id,
        19,
        i1,
        232,
        tlong,
        432,
        i1dv,
        300,
        t1,
        "many eggs on wall",
        b1dv,
        false,
        s1dv,
        "dent",
        oddField,
        "odd man in");
    indexr(
        id,
        20,
        i1,
        232,
        tlong,
        532,
        i1dv,
        150,
        t1,
        "some eggs on wall",
        b1dv,
        false,
        s1dv,
        "author",
        oddField,
        "odd man between");
    indexr(
        id,
        21,
        i1,
        232,
        tlong,
        632,
        i1dv,
        120,
        t1,
        "a few eggs on wall",
        b1dv,
        true,
        s1dv,
        "ford prefect",
        oddField,
        "odd man under");
    indexr(
        id,
        22,
        i1,
        232,
        tlong,
        732,
        i1dv,
        120,
        t1,
        "any eggs on wall",
        b1dv,
        false,
        s1dv,
        "ford prefect",
        oddField,
        "odd man above");
    indexr(
        id,
        23,
        i1,
        233,
        tlong,
        734,
        i1dv,
        120,
        t1,
        "dirty eggs",
        b1dv,
        true,
        s1dv,
        "Marvin",
        oddField,
        "odd eggs");

    for (int i = 100; i < 150; i++) {
      indexr(id, i);
    }

    int[] values = new int[] {9999, 99999, 999999, 9999999};
    for (int shard = 0; shard < clients.size(); shard++) {
      int groupValue = values[shard];
      for (int i = 500; i < 600; i++) {
        index_specific(
            shard, i1, groupValue, s1, "a", id, i * (shard + 1), t1, random().nextInt(7));
      }
    }

    commit();

    // test grouping
    // The second sort = id asc . The sorting behaviour is different in dist mode. See TopDocs#merge
    // The shard the result came from matters in the order if both document sortvalues are equal
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc");
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        0,
        "sort",
        i1 + " asc, id asc");
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        "id asc, _docid_ asc");
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        "{!func}add(" + i1 + ",5) asc, id asc");
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc",
        "facet",
        "true",
        "facet.field",
        t1);
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc",
        "stats",
        "true",
        "stats.field",
        tlong);
    query(
        "q",
        "kings",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc",
        "spellcheck",
        "true",
        "spellcheck.build",
        "true",
        "qt",
        "spellCheckCompRH",
        "df",
        "subject");
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc",
        "facet",
        "true",
        "hl",
        "true",
        "hl.fl",
        t1);
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc",
        "group.sort",
        "id desc");

    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.offset",
        5,
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc");
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "offset",
        5,
        "rows",
        5,
        "group.offset",
        5,
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc");
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "offset",
        5,
        "rows",
        5,
        "sort",
        i1 + " asc, id asc",
        "group.format",
        "simple");
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "offset",
        5,
        "rows",
        5,
        "sort",
        i1 + " asc, id asc",
        "group.main",
        "true");
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.offset",
        5,
        "group.limit",
        5,
        "sort",
        i1 + " asc, id asc",
        "group.format",
        "simple",
        "offset",
        5,
        "rows",
        5);
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.offset",
        5,
        "group.limit",
        5,
        "sort",
        i1 + " asc, id asc",
        "group.main",
        "true",
        "offset",
        5,
        "rows",
        5);

    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.query",
        t1 + ":kings OR " + t1 + ":eggs",
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc");
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.query",
        t1 + ":kings OR " + t1 + ":eggs",
        "group.limit",
        10,
        "sort",
        i1 + " asc, id asc");

    query(
        "q",
        "*:*",
        "fl",
        "id," + i1dv,
        "group",
        "true",
        "group.field",
        i1dv,
        "group.limit",
        10,
        "sort",
        i1 + " asc, id asc");

    // SOLR-4150: what if group.query has no matches,
    // or only matches on one shard
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.query",
        t1 + ":kings OR " + t1 + ":eggs",
        "group.query",
        "id:5", // single doc, so only one shard will have it
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc");
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.query",
        t1 + ":kings OR " + t1 + ":eggs",
        "group.query",
        t1 + ":this_will_never_match",
        "group.limit",
        10,
        "sort",
        i1 + " asc, id asc");

    // SOLR-4164: main query matches nothing, or only matches on one shard
    query(
        "q",
        "bogus_s:nothing", // no docs match
        "group",
        "true",
        "group.query",
        t1 + ":this_will_never_match",
        "group.field",
        i1,
        "fl",
        "id",
        "group.limit",
        "2",
        "group.format",
        "simple");
    query(
        "q",
        "id:5", // one doc matches, so only one shard
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.query",
        t1 + ":kings OR " + t1 + ":eggs",
        "group.field",
        i1,
        "group.limit",
        10,
        "sort",
        i1 + " asc, id asc");

    // SOLR-13404
    query(
        "q",
        "*:*",
        "group",
        "true",
        "group.query",
        t1 + ":kings OR " + t1 + ":eggs",
        "fl",
        "id",
        "group.format",
        "grouped",
        "group.limit",
        "2",
        "group.offset",
        "2",
        "sort",
        i1 + " asc, id asc");
    query(
        "q",
        "*:*",
        "group",
        "true",
        "group.query",
        t1 + ":kings OR " + t1 + ":eggs",
        "fl",
        "id",
        "group.format",
        "grouped",
        "group.limit",
        "-12",
        "sort",
        i1 + " asc, id asc");

    ignoreException("'group.offset' parameter cannot be negative");
    SolrException exception =
        expectThrows(
            SolrException.class,
            () ->
                query(
                    "q",
                    "*:*",
                    "group",
                    "true",
                    "group.query",
                    t1 + ":kings OR " + t1 + ":eggs",
                    "group.offset",
                    "-1"));
    assertEquals(SolrException.ErrorCode.BAD_REQUEST.code, exception.code());
    MatcherAssert.assertThat(
        exception.getMessage(), containsString("'group.offset' parameter cannot be negative"));
    resetExceptionIgnores();

    query(
        "q",
        "*:*",
        "group",
        "true",
        "group.query",
        t1 + ":kings OR " + t1 + ":eggs",
        "group.limit",
        "3",
        "fl",
        "id",
        "group.format",
        "simple",
        "sort",
        i1 + " asc, id asc");
    query(
        "q",
        "*:*",
        "group",
        "true",
        "group.query",
        t1 + ":kings OR " + t1 + ":eggs",
        "fl",
        "id",
        "group.main",
        "true",
        "sort",
        i1 + " asc, id asc");
    query(
        "q",
        "*:*",
        "group",
        "true",
        "group.query",
        t1 + ":kings OR " + t1 + ":eggs",
        "rows",
        "13",
        "start",
        "2",
        "fl",
        "id",
        "group.main",
        "true",
        "sort",
        i1 + " asc, id asc");

    // SOLR-9802
    query(
        "q",
        "*:*",
        "group",
        "true",
        "group.field",
        tdate_a,
        "sort",
        i1 + " asc, id asc",
        "fl",
        "id");

    // SOLR-3109
    query(
        "q",
        t1 + ":eggs",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        10,
        "sort",
        tlong + " asc, id asc");
    query(
        "q",
        i1 + ":232",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        10,
        "sort",
        tlong + " asc, id asc");

    // SOLR-12248
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + s1dv,
        "group",
        "true",
        "group.field",
        s1dv,
        "group.limit",
        -1,
        "sort",
        b1dv + " asc, id asc",
        "group.sort",
        "id desc");
    query(
        "q",
        "*:*",
        "fl",
        "id," + b1dv,
        "group",
        "true",
        "group.field",
        b1dv,
        "group.limit",
        10,
        "sort",
        s1dv + " asc, id asc");
    query(
        "q",
        s1dv + ":dent",
        "fl",
        "id," + b1dv,
        "group",
        "true",
        "group.field",
        b1dv,
        "group.limit",
        10,
        "sort",
        i1 + " asc, id asc");

    // In order to validate this we need to make sure that during indexing that all documents of one
    // group only occur on the same shard
    query(
        "q",
        "*:*",
        "fq",
        s1 + ":a",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        10,
        "sort",
        i1 + " asc, id asc",
        "group.ngroups",
        "true");
    query(
        "q",
        "*:*",
        "fq",
        s1 + ":a",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        10,
        "sort",
        i1 + " asc, id asc",
        "group.truncate",
        "true");
    query(
        "q",
        "*:*",
        "fq",
        s1 + ":a",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        10,
        "sort",
        i1 + " asc, id asc",
        "group.truncate",
        "true",
        "facet",
        "true",
        "facet.field",
        t1);
    for (String gfacet : new String[] {"true", "false"}) {
      for (String flimit : new String[] {"-100", "-1", "1", "2", "10000"}) {
        for (String foffset : new String[] {"0", "1", "2", "1000"}) {
          query(
              "q",
              "*:*",
              "fq",
              s1 + ":a",
              "rows",
              100,
              "fl",
              "id," + i1,
              "sort",
              i1 + " asc, id asc",
              "group",
              "true",
              "group.field",
              i1,
              "group.limit",
              10,
              "facet",
              "true",
              "facet.field",
              t1,
              "group.facet",
              gfacet,
              "facet.limit",
              flimit,
              "facet.offset",
              foffset);
        }
      }
    }

    // SOLR-3316
    query(
        "q",
        "*:*",
        "fq",
        s1 + ":a",
        "rows",
        0,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc",
        "facet",
        "true",
        "facet.field",
        t1);
    query(
        "q",
        "*:*",
        "fq",
        s1 + ":a",
        "rows",
        0,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc",
        "group.truncate",
        "true",
        "facet",
        "true",
        "facet.field",
        t1);

    // SOLR-3436
    query(
        "q",
        "*:*",
        "fq",
        s1 + ":a",
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "sort",
        i1 + " asc, id asc",
        "group.ngroups",
        "true");
    query(
        "q",
        "*:*",
        "fq",
        s1 + ":a",
        "rows",
        0,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "sort",
        i1 + " asc, id asc",
        "group.ngroups",
        "true");

    // SOLR-15273: if id was renamed we need to use the new name
    query(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "aliasId:id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        i1 + " asc, id asc");

    // SOLR-3960 - include a postfilter
    for (String facet : new String[] {"false", "true"}) {
      for (String fcache : new String[] {"", " cache=false cost=200"}) {
        query(
            "q",
            "*:*",
            "rows",
            100,
            "fl",
            "id," + i1,
            "group.limit",
            10,
            "sort",
            i1 + " asc, id asc",
            "group",
            "true",
            "group.field",
            i1,
            "fq",
            "{!frange l=50 " + fcache + "}" + tlong,
            "facet.field",
            t1,
            "facet",
            facet);
      }
    }

    // SOLR-6156: timeAllowed with rows>0 and rows==0
    for (String ngroups : new String[] {"false", "true"}) {
      for (String rows : new String[] {"10", "0"}) {
        simpleQuery(
            "q", "*:*", "group", "true", "group.field", i1, "group.ngroups", ngroups, "rows", rows);
        simpleQuery(
            "q",
            "*:*",
            "group",
            "true",
            "group.field",
            i1,
            "group.ngroups",
            ngroups,
            "rows",
            rows,
            "timeAllowed",
            "123456");
      }
    }

    ModifiableSolrParams params = new ModifiableSolrParams();
    Object[] q = {
      "q",
      "*:*",
      "fq",
      s1 + ":a",
      "rows",
      1,
      "fl",
      "id," + i1,
      "group",
      "true",
      "group.field",
      i1,
      "group.limit",
      -1,
      "group.ngroups",
      "true"
    };

    for (int i = 0; i < q.length; i += 2) {
      params.add(q[i].toString(), q[i + 1].toString());
    }

    setDistributedParams(params);

    int which = r.nextInt(clients.size());
    SolrClient client = clients.get(which);
    QueryResponse rsp = client.query(params);
    NamedList<?> nl = (NamedList<?>) rsp.getResponse().get("grouped");
    nl = (NamedList<?>) nl.getVal(0);
    int matches = (Integer) nl.getVal(0);
    int groupCount = (Integer) nl.get("ngroups");
    assertEquals(100 * shardsArr.length, matches);
    assertEquals(shardsArr.length, groupCount);

    // We validate distributed grouping with scoring as first sort.
    // note: this 'q' matches all docs and returns the 'id' as the score, which is unique and so our
    // results should be deterministic.
    handle.put("maxScore", SKIP); // TODO see SOLR-6612
    query(
        "q",
        "{!func}id_i1",
        "rows",
        100,
        "fl",
        "score,id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        i1 + " desc",
        "group.sort",
        "score desc"); // SOLR-2955
    query(
        "q",
        "{!func}id_i1",
        "rows",
        100,
        "fl",
        "score,id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        "score desc, _docid_ asc, id asc");
    query(
        "q",
        "{!func}id_i1",
        "rows",
        100,
        "fl",
        "score,id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1);

    query(
        "q",
        "*:*",
        "group",
        "true",
        "group.query",
        t1 + ":kings OR " + t1 + ":eggs",
        "group.limit",
        "3",
        "fl",
        "id,score",
        "sort",
        i1 + " asc, id asc");
    query(
        "q",
        "*:*",
        "group",
        "true",
        "group.query",
        t1 + ":kings OR " + t1 + ":eggs",
        "group.limit",
        "3",
        "fl",
        "id,score",
        "group.format",
        "simple",
        "sort",
        i1 + " asc, id asc");
    query(
        "q",
        "*:*",
        "group",
        "true",
        "group.query",
        t1 + ":kings OR " + t1 + ":eggs",
        "group.limit",
        "3",
        "fl",
        "id,score",
        "group.main",
        "true",
        "sort",
        i1 + " asc, id asc");

    // grouping shouldn't care if there are multiple fl params, or what order the fl field names are
    // in
    variantQuery(
        params(
            "q",
            "*:*",
            "group",
            "true",
            "group.field",
            i1dv,
            "group.limit",
            "10",
            "sort",
            i1 + " asc, id asc"),
        params("fl", "id," + i1dv),
        params("fl", i1dv + ",id"),
        params("fl", "id", "fl", i1dv),
        params("fl", i1dv, "fl", "id"));
    variantQuery(
        params(
            "q",
            "*:*",
            "rows",
            "100",
            "group",
            "true",
            "group.field",
            s1dv,
            "group.limit",
            "-1",
            "sort",
            b1dv + " asc, id asc",
            "group.sort",
            "id desc"),
        params("fl", "id," + s1dv + "," + tdate_a),
        params("fl", "id", "fl", s1dv, "fl", tdate_a),
        params("fl", tdate_a, "fl", s1dv, "fl", "id"));
    variantQuery(
        params(
            "q",
            "*:*",
            "rows",
            "100",
            "group",
            "true",
            "group.field",
            s1dv,
            "group.limit",
            "-1",
            "sort",
            b1dv + " asc, id asc",
            "group.sort",
            "id desc"),
        params("fl", s1dv + "," + tdate_a),
        params("fl", s1dv, "fl", tdate_a),
        params("fl", tdate_a, "fl", s1dv));
    variantQuery(
        params(
            "q",
            "{!func}id_i1",
            "rows",
            "100",
            "group",
            "true",
            "group.field",
            i1,
            "group.limit",
            "-1",
            "sort",
            tlong + " asc, id desc"),
        params("fl", t1 + ",score," + i1dv),
        params("fl", t1, "fl", "score", "fl", i1dv),
        params("fl", "score", "fl", t1, "fl", i1dv));

    // some explicit checks of non default sorting, and sort/group.sort with diff clauses
    query(
        "q",
        "{!func}id_i1",
        "rows",
        100,
        "fl",
        tlong + ",id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        tlong + " asc, id desc");
    query(
        "q",
        "{!func}id_i1",
        "rows",
        100,
        "fl",
        tlong + ",id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        "id asc",
        "group.sort",
        tlong + " asc, id desc");
    query(
        "q",
        "{!func}id_i1",
        "rows",
        100,
        "fl",
        tlong + ",id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "group.limit",
        -1,
        "sort",
        tlong + " asc, id desc",
        "group.sort",
        "id asc");
    for (boolean withFL : new boolean[] {true, false}) {
      if (withFL) {
        rsp =
            variantQuery(
                params(
                    "q",
                    "{!func}id_i1",
                    "fq",
                    oddField + ":[* TO *]",
                    "rows",
                    "100",
                    "group",
                    "true",
                    "group.field",
                    i1,
                    "group.limit",
                    "-1",
                    "sort",
                    tlong + " asc",
                    "group.sort",
                    oddField + " asc"),
                params("fl", tlong + ",id," + i1),
                params("fl", tlong, "fl", "id", "fl", i1),
                params("fl", "id", "fl", i1, "fl", tlong));
      } else {
        // special check: same query, but empty fl...
        rsp =
            query(
                "q",
                "{!func}id_i1",
                "fq",
                oddField + ":[* TO *]",
                "rows",
                "100",
                "group",
                "true",
                "group.field",
                i1,
                "group.limit",
                "-1",
                "sort",
                tlong + " asc",
                "group.sort",
                oddField + " asc");
      }
      nl = (NamedList<?>) rsp.getResponse().get("grouped");
      nl = (NamedList<?>) nl.get(i1);
      assertEquals(rsp.toString(), 6, nl.get("matches"));
      assertEquals(rsp.toString(), 2, ((List<NamedList<?>>) nl.get("groups")).size());
      nl = ((List<NamedList<?>>) nl.get("groups")).get(0);
      assertEquals(rsp.toString(), 232, nl.get("groupValue"));
      SolrDocumentList docs = (SolrDocumentList) nl.get("doclist");
      assertEquals(docs.toString(), 5, docs.getNumFound());
      //
      assertEquals(docs.toString(), "22", docs.get(0).getFirstValue("id"));
      assertEquals(docs.toString(), 732L, docs.get(0).getFirstValue(tlong));
      assertEquals(docs.toString(), 232, docs.get(0).getFirstValue(i1));
      //
      assertEquals(docs.toString(), "21", docs.get(4).getFirstValue("id"));
      assertEquals(docs.toString(), 632L, docs.get(4).getFirstValue(tlong));
      assertEquals(docs.toString(), 232, docs.get(4).getFirstValue(i1));
      //
      if (withFL == false) {
        // exact number varies based on test randomization, but there should always be at least the
        // 8 explicitly indexed in these 2 docs...
        assertTrue(docs.toString(), 8 <= docs.get(0).getFieldNames().size());
        assertTrue(docs.toString(), 8 <= docs.get(4).getFieldNames().size());
      }
    }

    // grouping on boolean non-stored docValued enabled field
    rsp =
        query(
            "q",
            b1dv + ":*",
            "fl",
            "id," + b1dv,
            "group",
            "true",
            "group.field",
            b1dv,
            "group.limit",
            10,
            "sort",
            b1dv + " asc, id asc");
    nl = (NamedList<?>) rsp.getResponse().get("grouped");
    nl = (NamedList<?>) nl.get(b1dv);
    assertEquals(rsp.toString(), 9, nl.get("matches"));
    assertEquals(rsp.toString(), 2, ((List<NamedList<?>>) nl.get("groups")).size());
    nl = ((List<NamedList<?>>) nl.get("groups")).get(0);
    assertEquals(rsp.toString(), false, nl.get("groupValue"));
    SolrDocumentList docs = (SolrDocumentList) nl.get("doclist");
    assertEquals(docs.toString(), 4, docs.getNumFound());

    // Can't validate the response, but can check if no errors occur.
    simpleQuery(
        "q",
        "*:*",
        "rows",
        100,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.query",
        t1 + ":kings OR " + t1 + ":eggs",
        "group.limit",
        10,
        "sort",
        i1 + " asc, id asc",
        CommonParams.TIME_ALLOWED,
        1);

    // Debug
    simpleQuery(
        "q",
        "*:*",
        "rows",
        10,
        "fl",
        "id," + i1,
        "group",
        "true",
        "group.field",
        i1,
        "debug",
        "true");
  }

  private void simpleQuery(Object... queryParams) throws SolrServerException, IOException {
    ModifiableSolrParams params = new ModifiableSolrParams();
    for (int i = 0; i < queryParams.length; i += 2) {
      params.add(queryParams[i].toString(), queryParams[i + 1].toString());
    }
    params.set("shards", shards);
    queryServer(params);
  }

  /**
   * Special helper method for verifying that multiple queries behave the same as each other, both
   * in distributed and single node queries
   *
   * @param commonParams params that are common to all queries
   * @param variantParams params that will be appended to the common params to create a variant
   *     query
   * @return the last response returned by the last variant
   * @see #query
   * @see #compareResponses
   * @see SolrParams#wrapAppended
   */
  protected QueryResponse variantQuery(
      final SolrParams commonParams, final SolrParams... variantParams) throws Exception {
    QueryResponse lastResponse = null;
    for (SolrParams extra : variantParams) {
      final QueryResponse rsp = query(SolrParams.wrapAppended(commonParams, extra));
      if (null != lastResponse) {
        compareResponses(rsp, lastResponse);
      }
      lastResponse = rsp;
    }
    return lastResponse;
  }
}
