remote exchange (GATHER, SINGLE, [])
    local exchange (GATHER, UNKNOWN, [])
        remote exchange (REPARTITION, ROUND_ROBIN, [])
            final aggregation over (count)
                local exchange (GATHER, SINGLE, [])
                    remote exchange (REPARTITION, HASH, [count])
                        partial aggregation over (count)
                            final aggregation over (custkey)
                                local exchange (GATHER, SINGLE, [])
                                    partial aggregation over (custkey)
                                        join (RIGHT, PARTITIONED):
                                            remote exchange (REPARTITION, HASH, [custkey_0])
                                                dynamic filter (custkey_0::EQUAL)
                                                    scan orders
                                            local exchange (GATHER, SINGLE, [])
                                                remote exchange (REPARTITION, HASH, [custkey])
                                                    scan customer
