presto-redis/src/main/java/io/prestosql/plugin/redis/RedisConnectorConfig.java/RedisConnectorConfig/setRedisKeyDelimiter
class RedisConnectorConfig:    @Config("redis.key-delimiter")
    public RedisConnectorConfig setRedisKeyDelimiter(String redisKeyDelimiter)
    {
        this.redisKeyDelimiter = redisKeyDelimiter.charAt(0);
        return this;
    }