StatisticsLastUpdated.php

<?php

namespace Drupal\comment\Plugin\views\field;

use Drupal\views\Attribute\ViewsField;
use Drupal\views\Plugin\views\field\Date;

/**
 * Field handler to display the newer of last comment / node updated.
 *
 * @ingroup views_field_handlers
 */
class StatisticsLastUpdated extends Date {
  
  /**
   * The node table.
   */
  // phpcs:ignore Drupal.NamingConventions.ValidVariableName.LowerCamelName, Drupal.Commenting.VariableComment.Missing
  protected ?string $node_table;
  
  /**
   * {@inheritdoc}
   */
  public function query() {
    $this->ensureMyTable();
    $this->node_table = $this->query
      ->ensureTable('node_field_data', $this->relationship);
    $this->field_alias = $this->query
      ->addField(NULL, "GREATEST(" . $this->node_table . ".changed, " . $this->tableAlias . ".last_comment_timestamp)", $this->tableAlias . '_' . $this->field);
  }

}