Imports cloud.google.com/go/bigquery/datatransfer/apiv1 google.golang.org/api/iterator google.golang.org/genproto/googleapis/cloud/bigquery/datatransfer/v1 google.golang.org/protobuf/types/known/fieldmaskpb google.golang.org/protobuf/types/known/structpb Standard library imports context flag fmt io/ioutil log os regexp strings