title: Save result of operator in Apache Airflow
body: <p>Several operators allow to pull data but I never managed to use the results.</p>
  
  <p>For example:
  <a href="https://github.com/apache/incubator-airflow/blob/master/airflow/contrib/operators/bigquery_get_data.py" rel="nofollow noreferrer">https://github.com/apache/incubator-airflow/blob/master/airflow/contrib/operators/bigquery_get_data.py</a></p>
  
  <p>This operator can be called as follow:</p>
  
  <pre><code>get_data = BigQueryGetDataOperator(
        task_id='get_data_from_bq',
        dataset_id='test_dataset',
        table_id='Transaction_partitions',
        max_results='100',
        selected_fields='DATE',
        bigquery_conn_id='airflow-service-account'
        )
  </code></pre>
  
  <p>Yet, get_data is of type DAG but line 116 says "return table_data".
  To be clear, the operator works and retrieve the data, I just don't understand how to use the data retrieve/where it is located.</p>
  
  <p>How do I get the data using "get_data" above?</p>