value = stream((String[]) value).get(stream -> stream.collect(Collectors.joining("\n")));
                } else if (value instanceof List) {
                    @SuppressWarnings("unchecked")
                    final List<String> list = (List<String>) value;
                    value = list.stream().collect(Collectors.joining("\n"));
                }
            } else if (dateFieldSet.contains(key)) {

                Locale.ROOT,
                "Docker (checked [%s]) is required to run the following task%s: \n%s",
                String.join(", ", DOCKER_BINARIES),
                tasks.size() > 1 ? "s" : "",
                String.join("\n", tasks)
            );
            throwDockerRequiredException(message);
        }

            if (!errors.isEmpty()) {
                crawlingInfoHelper.putToInfoMap(Constants.CRAWLER_ERRORS,
                        errors.stream().map(s -> s.replace(" ", StringUtil.EMPTY)).collect(Collectors.joining(" ")));
            }
            writeTimeToSessionInfo(crawlingInfoHelper, Constants.CRAWLER_END_TIME);

                }
            });
        }

        for (Thread th : threads) {
            th.start();
        }
        for (Thread th : threads) {
            th.join();
        }
        assertEquals(num, count.get());
        assertEquals(num, valueSet.size());

        Set<String> valueSet2 = Collections.synchronizedSet(new HashSet<>());
        threads = new Thread[threadNum];

        }
        for (int i = 0; i < crawlerContext.numOfThread; i++) {
            threads[i].start();
        }

        // join
        for (int i = 0; i < crawlerContext.numOfThread; i++) {
            try {
                threads[i].join();
            } catch (final InterruptedException e) {

func getSignedHeaders(signedHeaders http.Header) string {
	var headers []string
	for k := range signedHeaders {
		headers = append(headers, strings.ToLower(k))
	}
	sort.Strings(headers)
	return strings.Join(headers, ";")
}

// getCanonicalRequest generate a canonical request of style
//
// canonicalRequest =
//
//	<HTTPMethod>\n
//	<CanonicalURI>\n
//	<CanonicalQueryString>\n
//	<CanonicalHeaders>\n

        Set<ApiChange> left = new HashSet<>(acceptedApiChanges);
        left.removeAll(seenApiChanges);
        if (!left.isEmpty()) {
            String formattedLeft = CollectionUtils.join("\n", left);
            throw new RuntimeException("The following regressions are declared as accepted, but didn't match any rule:\n\n" + formattedLeft);
        }
    }

			}
			return joinDB.Delete(nil).Error
		case clause.OpUpdate:
			// Update related table rows that have join rows matching owners
			relatedDB := base.Session(&Session{NewDB: true, Context: ctx}).Table(rel.FieldSchema.Table).Where(op.Conditions)

			// correlated join subquery: join.rel_fk = related.pk AND EXISTS owners
			joinSub := base.Session(&Session{NewDB: true, Context: ctx}).Table(rel.JoinTable.Table).Select("1")

        if (indexUpdater != null && indexUpdater.isAlive()) {
            indexUpdater.setFinishCrawling(true);
            indexUpdater.interrupt();
            indexUpdater.join(1000);
        }
        super.tearDown(testInfo);
    }

    // Test initialization
    @Test
    public void test_init() {
        indexUpdater.init();
        assertNotNull(indexUpdater);
    }

  }

  /**
   * Waits for the specified time (in milliseconds) for the thread to terminate (using {@link
   * Thread#join(long)}), else interrupts the thread (in the hope that it may terminate later) and
   * fails.
   */
  final void awaitTermination(Thread t, long timeoutMillis) {
    try {
      t.join(timeoutMillis);
    } catch (InterruptedException ie) {
      threadUnexpectedException(ie);
    } finally {