presto-main/src/main/java/io/prestosql/sql/planner/optimizations/PreferredProperties.java/PreferredProperties/Global
class PreferredProperties:        private Global(boolean distributed, Optional<PartitioningProperties> partitioningProperties)
        {
            this.distributed = distributed;
            this.partitioningProperties = requireNonNull(partitioningProperties, "partitioningProperties is null");
        }