applyAccessConditions example

if (is_null($field_storage_definition)) {
        // When the field storage definition is NULL, this specifier is the         // first specifier in an entity query field path or the previous         // specifier was a data reference that has been traversed. In both         // cases, the specifier must be a field name.         $field_storage_definitions = static::$fieldManager->getFieldStorageDefinitions($entity_type_id);
        static::secureQuery($query, $entity_type_id, $children, $cacheability, $child_prefix, $field_storage_definitions[$specifier]);
        // When $field_prefix is NULL, this must be the first specifier in the         // entity query field path and a condition for the query's base entity         // type must be applied.         if (is_null($field_prefix)) {
          static::applyAccessConditions($query, $entity_type_id, NULL, $cacheability);
        }
      }
      else {
        // When the specifier is an entity reference, it can contain an entity         // type specifier, like so: `entity:node`. This extracts the `entity`         // portion. JSON:API will have already validated that the property         // exists.         $split_specifier = explode(':', $specifier, 2);
        [$property_name, $target_entity_type_id] = array_merge($split_specifier, count($split_specifier) === 2 ? [] : [NULL]);
        // The specifier is either a field property or a delta. If it is a data         // reference or a delta, then it needs to be traversed to the next