code: @Override
  	public Optional<Map<String, Object>> findFirst(final CaseFormat caseFormat) {
  		try (Stream<Map<String, Object>> stream = stream(
  				new MapResultSetConverter(agent.getSqlConfig().getDialect(), caseFormat))) {
  			return stream.findFirst();
  		}
  	}
docs: {@inheritDoc}
  
  @see jp.co.future.uroborosql.fluent.SqlQuery#findFirst(jp.co.future.uroborosql.utils.CaseFormat)