local exchange (GATHER, SINGLE, [])
    remote exchange (GATHER, SINGLE, [])
        final aggregation over (ss_customer_sk)
            local exchange (GATHER, SINGLE, [])
                remote exchange (REPARTITION, HASH, [ss_customer_sk])
                    partial aggregation over (ss_customer_sk)
                        join (INNER, REPLICATED):
                            join (LEFT, PARTITIONED):
                                remote exchange (REPARTITION, HASH, [ss_item_sk, ss_ticket_number])
                                    scan store_sales
                                local exchange (GATHER, SINGLE, [])
                                    remote exchange (REPARTITION, HASH, [sr_item_sk, sr_ticket_number])
                                        scan store_returns
                            local exchange (GATHER, SINGLE, [])
                                remote exchange (REPLICATE, BROADCAST, [])
                                    scan reason
