drupal/core/modules/taxonomy/taxonomy.install

<?php

/**
 * @file
 * Install, update and uninstall functions for the taxonomy module.
 */

use Drupal\Core\Field\BaseFieldDefinition;

/**
 * Convert the custom taxonomy term hierarchy storage to a default storage.
 */
function taxonomy_update_8501() {
  $definition_update_manager = \Drupal::entityDefinitionUpdateManager();

  /** @var \Drupal\Core\Field\BaseFieldDefinition $field_storage_definition */
  $field_storage_definition = $definition_update_manager->getFieldStorageDefinition('parent', 'taxonomy_term');
  $field_storage_definition->setCustomStorage(FALSE);
  $definition_update_manager->updateFieldStorageDefinition($field_storage_definition);
}

/**
 * Copy hierarchy from {taxonomy_term_hierarchy} to {taxonomy_term__parent}.
 */
function taxonomy_update_8502(&$sandbox) {
  $database = \Drupal::database();

  if (!isset($sandbox['current'])) {
    // Set batch ops sandbox.
    $sandbox['current'] = 0;
    $sandbox['max'] = $database->select('taxonomy_term_hierarchy')
      ->countQuery()
      ->execute()
      ->fetchField();
  }

  // Save the hierarchy.
  $select = $database->select('taxonomy_term_hierarchy', 'h');
  $select->join('taxonomy_term_data', 'd', 'h.tid = d.tid');
  $hierarchy = $select
    ->fields('h', ['tid', 'parent'])
    ->fields('d', ['vid', 'langcode'])
    ->range($sandbox['current'], $sandbox['current'] + 100)
    ->execute()
    ->fetchAll();

  // Restore data.
  $insert = $database->insert('taxonomy_term__parent')
    ->fields(['bundle', 'entity_id', 'revision_id', 'langcode', 'delta', 'parent_target_id']);
  $tid = -1;

  foreach ($hierarchy as $row) {
    if ($row->tid !== $tid) {
      $delta = 0;
      $tid = $row->tid;
    }

    $insert->values([
      'bundle' => $row->vid,
      'entity_id' => $row->tid,
      'revision_id' => $row->tid,
      'langcode' => $row->langcode,
      'delta' => $delta,
      'parent_target_id' => $row->parent,
    ]);

    $delta++;
    $sandbox['current']++;
  }

  $insert->execute();

  $sandbox['#finished'] = empty($sandbox['max']) ? 1 : ($sandbox['current'] / $sandbox['max']);

  if ($sandbox['#finished'] >= 1) {
    // Update the entity type because the 'taxonomy_term_hierarchy' table is no
    // longer part of its shared tables schema.
    $definition_update_manager = \Drupal::entityDefinitionUpdateManager();
    $definition_update_manager->updateEntityType($definition_update_manager->getEntityType('taxonomy_term'));

    // \Drupal\Core\Entity\Sql\SqlContentEntityStorageSchema::onEntityTypeUpdate()
    // only deletes *known* entity tables (i.e. the base, data and revision
    // tables), so we have to drop it manually.
    $database->schema()->dropTable('taxonomy_term_hierarchy');

    return t('Taxonomy term hierarchy has been converted to default entity reference storage.');
  }
}

/**
 * Update views to use {taxonomy_term__parent} in relationships.
 */
function taxonomy_update_8503() {
  $config_factory = \Drupal::configFactory();

  foreach ($config_factory->listAll('views.view.') as $id) {
    $view = $config_factory->getEditable($id);

    foreach (array_keys($view->get('display')) as $display_id) {
      $changed = FALSE;

      foreach (['relationships', 'filters', 'arguments'] as $handler_type) {
        $base_path = "display.$display_id.display_options.$handler_type";
        $handlers = $view->get($base_path);

        if (!$handlers) {
          continue;
        }

        foreach ($handlers as $handler_key => $handler_config) {
          $table_path = "$base_path.$handler_key.table";
          $field_path = "$base_path.$handler_key.field";
          $table = $view->get($table_path);
          $field = $view->get($field_path);

          if (($table && ($table === 'taxonomy_term_hierarchy')) && ($field && ($field === 'parent'))) {
            $view->set($table_path, 'taxonomy_term__parent');
            $view->set($field_path, 'parent_target_id');

            $changed = TRUE;
          }
        }
      }

      if ($changed) {
        $view->save(TRUE);
      }
    }
  }
}

/**
 * Add the publishing status fields to taxonomy terms.
 */
function taxonomy_update_8601() {
  $definition_update_manager = \Drupal::entityDefinitionUpdateManager();
  $entity_type = $definition_update_manager->getEntityType('taxonomy_term');

  // Bail out early if a field named 'status' is already installed.
  if ($definition_update_manager->getFieldStorageDefinition('status', 'taxonomy_term')) {
    $message = \Drupal::state()->get('taxonomy_update_8601_skip_message', t('The publishing status field has <strong>not</strong> been added to taxonomy terms. See <a href=":link">this page</a> for more information on how to install it.', [
      ':link' => 'https://www.drupal.org/node/2985366',
    ]));
    return $message;
  }

  // Add the 'published' entity key to the taxonomy_term entity type.
  $entity_keys = $entity_type->getKeys();
  $entity_keys['published'] = 'status';
  $entity_type->set('entity_keys', $entity_keys);

  $definition_update_manager->updateEntityType($entity_type);

  // Add the status field.
  $status = BaseFieldDefinition::create('boolean')
    ->setLabel(t('Publishing status'))
    ->setDescription(t('A boolean indicating the published state.'))
    ->setRevisionable(TRUE)
    ->setTranslatable(TRUE)
    ->setDefaultValue(TRUE);

  $has_content_translation_status_field = \Drupal::moduleHandler()->moduleExists('content_translation') && $definition_update_manager->getFieldStorageDefinition('content_translation_status', 'taxonomy_term');
  if ($has_content_translation_status_field) {
    $status->setInitialValueFromField('content_translation_status', TRUE);
  }
  else {
    $status->setInitialValue(TRUE);
  }
  $definition_update_manager->installFieldStorageDefinition('status', 'taxonomy_term', 'taxonomy_term', $status);

  // Uninstall the 'content_translation_status' field if needed.
  if ($has_content_translation_status_field) {
    $content_translation_status = $definition_update_manager->getFieldStorageDefinition('content_translation_status', 'taxonomy_term');
    $definition_update_manager->uninstallFieldStorageDefinition($content_translation_status);
  }

  return t('The publishing status field has been added to taxonomy terms.');
}