class StatisticsLastCommentName

class StatisticsLastCommentName extends FieldPluginBase {
    
    /**
     * The users table.
     */
    protected $user_table;
    
    /**
     * The user name field.
     */
    protected $user_field;
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        // last_comment_name only contains data if the user is anonymous. So we
        // have to join in a specially related user table.
        $this->ensureMyTable();
        // join 'users' to this table via vid
        $definition = [
            'table' => 'users_field_data',
            'field' => 'uid',
            'left_table' => 'comment_entity_statistics',
            'left_field' => 'last_comment_uid',
            'extra' => [
                [
                    'field' => 'uid',
                    'operator' => '!=',
                    'value' => '0',
                ],
            ],
        ];
        $join = \Drupal::service('plugin.manager.views.join')->createInstance('standard', $definition);
        // nes_user alias so this can work with the sort handler, below.
        $this->user_table = $this->query
            ->ensureTable('ces_users', $this->relationship, $join);
        $this->field_alias = $this->query
            ->addField(NULL, "COALESCE({$this->user_table}.name, {$this->tableAlias}.{$this->field})", $this->tableAlias . '_' . $this->field);
        $this->user_field = $this->query
            ->addField($this->user_table, 'name');
        $this->uid = $this->query
            ->addField($this->tableAlias, 'last_comment_uid');
    }
    
    /**
     * {@inheritdoc}
     */
    protected function defineOptions() {
        $options = parent::defineOptions();
        $options['link_to_user'] = [
            'default' => TRUE,
        ];
        return $options;
    }
    
    /**
     * {@inheritdoc}
     */
    public function render(ResultRow $values) {
        if (!empty($this->options['link_to_user'])) {
            $account = User::create();
            $account->name = $this->getValue($values);
            $account->uid = $values->{$this->uid};
            $username = [
                '#theme' => 'username',
                '#account' => $account,
            ];
            return \Drupal::service('renderer')->render($username);
        }
        else {
            return $this->sanitizeValue($this->getValue($values));
        }
    }

}