presto-main/src/main/java/io/prestosql/sql/planner/PartitioningScheme.java/PartitioningScheme/PartitioningScheme
class PartitioningScheme:    public PartitioningScheme(Partitioning partitioning, List<Symbol> outputLayout, Optional<Symbol> hashColumn)
    {
        this(
                partitioning,
                outputLayout,
                hashColumn,
                false,
                Optional.empty());
    }