protected ContentEntityNullStorage::readFieldItemsToPurge(FieldDefinitionInterface $field_definition, $batch_size)
Reads values to be purged for a single field.
This method is called during field data purge, on fields for which onFieldDefinitionDelete() has previously run.
\Drupal\Core\Field\FieldDefinitionInterface $field_definition: The field definition.
$batch_size: The maximum number of field data records to purge before returning.
\Drupal\Core\Field\FieldItemListInterface[] An array of field item lists, keyed by entity revision id.
Overrides ContentEntityStorageBase::readFieldItemsToPurge
protected function readFieldItemsToPurge(FieldDefinitionInterface $field_definition, $batch_size) { return array(); }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!ContentEntityNullStorage.php/function/ContentEntityNullStorage::readFieldItemsToPurge/8.1.x