arch-8.x-1.x-dev/modules/product/modules/group/arch_product_group.install

<?php

/**
 * @file
 * Grouped product module install/update hooks.
 */

/**
 * Implements hook_install().
 */
function arch_product_group_install() {
  $db = \Drupal::database();

  $update = $db->update('arch_product_field_data');
  $update->expression('group_id', 'pid');
  $update->execute();
}