presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/RaptorPartitioningHandle.java/RaptorPartitioningHandle/RaptorPartitioningHandle
class RaptorPartitioningHandle:    @JsonCreator
    public RaptorPartitioningHandle(
            @JsonProperty("distributionId") long distributionId,
            @JsonProperty("bucketToNode") List<String> bucketToNode)
    {
        this.distributionId = distributionId;
        this.bucketToNode = ImmutableList.copyOf(requireNonNull(bucketToNode, "bucketToNode is null"));
    }