title: read data from BigQuery and/or Cloud Storage GCS into Dataproc
body: <p>I am reading data from BigQuery into dataproc spark cluster. If the data in BigQuery table in my case is originally loaded from GCS, then is it better to read data from GCS directly into spark cluster, since BigQuery connector for dataproc (newAPIHadoopRDD) downloads data into Google Cloud Storage bucket first?  Any pros and cons between these two methods?</p>