presto-main/src/main/java/io/prestosql/sql/planner/SystemPartitioningHandle.java/SystemPartitioningHandle/equals
class SystemPartitioningHandle:    @Override
    public boolean equals(Object o)
    {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        SystemPartitioningHandle that = (SystemPartitioningHandle) o;
        return partitioning == that.partitioning &&
                function == that.function;
    }