presto-main/src/main/java/io/prestosql/sql/planner/PartitioningScheme.java/PartitioningScheme/toString
class PartitioningScheme:    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("partitioning", partitioning)
                .add("outputLayout", outputLayout)
                .add("hashChannel", hashColumn)
                .add("replicateNullsAndAny", replicateNullsAndAny)
                .add("bucketToPartition", bucketToPartition)
                .toString();
    }