code: func TraceDatastore(ctx context.Context, table, operation, sql, rollupName string) *Trace {
  	return trace(ctx, rollupName, func(tx Tx) error {
  		return tx.StartDatastore(table, operation, sql, rollupName)
  	})
  }
docs: // TraceDatastore adds a datastore segment to the newrelic transaction, if one exists in the context.