presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/RaptorMetadata.java/RaptorMetadata/parseFragments
class RaptorMetadata:    private static Collection<ShardInfo> parseFragments(Collection<Slice> fragments)
    {
        return fragments.stream()
                .map(fragment -> SHARD_INFO_CODEC.fromJson(fragment.getBytes()))
                .collect(toList());
    }