presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/RaptorTableHandle.java/RaptorTableHandle/getPartitioningHandle
class RaptorTableHandle:    @JsonIgnore
    public Optional<RaptorPartitioningHandle> getPartitioningHandle()
    {
        return distributionId.map(id -> new RaptorPartitioningHandle(id, bucketAssignments.get()));
    }