presto-main/src/main/java/io/prestosql/sql/planner/optimizations/PreferredProperties.java/PartitioningProperties/toString
class PartitioningProperties:        @Override
        public String toString()
        {
            return toStringHelper(this)
                    .add("partitioningColumns", partitioningColumns)
                    .add("partitioning", partitioning)
                    .add("nullsAndAnyReplicated", nullsAndAnyReplicated)
                    .toString();
        }