presto-redis/src/main/java/io/prestosql/plugin/redis/decoder/hash/HashRedisRowDecoder.java/HashRedisRowDecoder/HashRedisRowDecoder
class HashRedisRowDecoder:    public HashRedisRowDecoder(Map<DecoderColumnHandle, RedisFieldDecoder<String>> fieldDecoders)
    {
        this.fieldDecoders = ImmutableMap.copyOf(fieldDecoders);
    }