SqlContentEntityStorage::doDeleteFieldItems

protected SqlContentEntityStorage::doDeleteFieldItems($entities)

protected function doDeleteFieldItems($entities) {
  $ids = array_keys($entities);

  $this->database->delete($this->entityType->getBaseTable())
    ->condition($this->idKey, $ids, 'IN')
    ->execute();

  if ($this->revisionTable) {
    $this->database->delete($this->revisionTable)
      ->condition($this->idKey, $ids, 'IN')
      ->execute();
  }

  if ($this->dataTable) {
    $this->database->delete($this->dataTable)
      ->condition($this->idKey, $ids, 'IN')
      ->execute();
  }

  if ($this->revisionDataTable) {
    $this->database->delete($this->revisionDataTable)
      ->condition($this->idKey, $ids, 'IN')
      ->execute();
  }

  foreach ($entities as $entity) {
    $this->deleteFromDedicatedTables($entity);
  }
}