code: func builtinSysDate(args []types.Datum, ctx context.Context) (types.Datum, error) {
  	// SYSDATE is not the same as NOW if NOW is used in a stored function or trigger.
  	// But here we can just think they are the same because we don't support stored function
  	// and trigger now.
  	return builtinNow(args, ctx)
  }
docs: // See https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_sysdate