code: func NewUploader(ctx context.Context, c *bigquery.Client, datasetID, tableID string) *Uploader {
  	return &Uploader{
  		DatasetID: datasetID,
  		TableID:   tableID,
  		Uploader:  c.Dataset(datasetID).Table(tableID).Uploader(),
  	}
  }
docs: // NewUploader constructs a new Uploader struct.
  //
  // DatasetID and TableID are provided to the BigQuery client to
  // gain access to a particular table.
  //
  // You may want to change the default configuration of the bigquery.Uploader.
  // Check the documentation for more details.
  //
  // Set UploadsMetricName on the resulting Uploader to use the default counter
  // metric.
  //
  // Set BatchSize to set a custom batch size.