NcsLastUpdated.php

1. 8.x drupal/core/modules/comment/lib/Drupal/comment/Plugin/views/field/NcsLastUpdated.php
2. 8.x drupal/core/modules/comment/lib/Drupal/comment/Plugin/views/sort/NcsLastUpdated.php
3. 8.x drupal/core/modules/comment/lib/Drupal/comment/Plugin/views/filter/NcsLastUpdated.php

<?php

/**
 * @file
 * Definition of Drupal\comment\Plugin\views\sort\NcsLastUpdated.
 */
namespace Drupal\comment\Plugin\views\sort;

use Drupal\views\Plugin\views\sort\Date;
use Drupal\Component\Annotation\PluginID;

/**
 * Sort handler for the newer of last comment / node updated.
 *
 * @ingroup views_sort_handlers
 *
 * @PluginID("ncs_last_updated")
 */
class NcsLastUpdated extends Date {
  public function query() {
    $this
      ->ensureMyTable();
    $this->node_table = $this->query
      ->ensure_table('node', $this->relationship);
    $this->field_alias = $this->query
      ->addOrderBy(NULL, "GREATEST(" . $this->node_table . ".changed, " . $this->tableAlias . ".last_comment_timestamp)", $this->options['order'], $this->tableAlias . '_' . $this->field);
  }

}