GroupByNumeric.php

<?php

namespace Drupal\views\Plugin\views\argument;

use Drupal\views\Attribute\ViewsArgument;

/**
 * Simple handler for arguments using group by.
 *
 * @ingroup views_argument_handlers
 */
class GroupByNumeric extends ArgumentPluginBase {
  public function query($group_by = FALSE) {
    $this->ensureMyTable();
    $field = $this->getField();
    $placeholder = $this->placeholder();
    $this->query
      ->addHavingExpression(0, "{$field} = {$placeholder}", [
      $placeholder => $this->argument,
    ]);
  }
  public function adminLabel($short = FALSE) {
    return $this->getField(parent::adminLabel($short));
  }
  
  /**
   * {@inheritdoc}
   */
  public function getSortName() {
    return $this->t('Numerical', [], [
      'context' => 'Sort order',
    ]);
  }

}