presto-redis/src/main/java/io/prestosql/plugin/redis/RedisConnectorConfig.java/RedisConnectorConfig/parseNodes
class RedisConnectorConfig:    public static ImmutableSet<HostAddress> parseNodes(String nodes)
    {
        Splitter splitter = Splitter.on(',').omitEmptyStrings().trimResults();

        return StreamSupport.stream(splitter.split(nodes).spliterator(), false)
                .map(RedisConnectorConfig::toHostAddress)
                .collect(toImmutableSet());
    }