code: func (l *Log) doInsert(ctx context.Context, req *bqapi.TableDataInsertAllRequest) (*bqapi.TableDataInsertAllResponse, error) {
  	ctx, _ = clock.WithTimeout(ctx, 30*time.Second)
  	logging.Infof(ctx, "Sending %d rows to BigQuery", len(req.Rows))
  	bq, err := l.bigQuery(ctx)
  	if err != nil {
  		return nil, err
  	}
  	call := bq.Tabledata.InsertAll(l.projID(ctx), l.DatasetID, l.TableID, req)
  	return call.Context(ctx).Do()
  }
docs: // doInsert does the actual BigQuery call.
  //
  // It is mocked in tests.