code: def referenced_tables(self):
          
          tables = []
          datasets_by_project_name = {}
  
          for table in self._job_statistics().get("referencedTables", ()):
  
              t_project = table["projectId"]
  
              ds_id = table["datasetId"]
              t_dataset = datasets_by_project_name.get((t_project, ds_id))
              if t_dataset is None:
                  t_dataset = DatasetReference(t_project, ds_id)
                  datasets_by_project_name[(t_project, ds_id)] = t_dataset
  
              t_name = table["tableId"]
              tables.append(t_dataset.table(t_name))
  
          return tables
docs: Return referenced tables from job statistics, if present.
  
          See:
          https://cloud.google.com/bigquery/docs/reference/rest/v2/jobs#statistics.query.referencedTables
  
          :rtype: list of dict
          :returns: mappings describing the query plan, or an empty list
                    if the query has not yet completed.