remote exchange (GATHER, SINGLE, [])
    local exchange (GATHER, UNKNOWN, [])
        remote exchange (REPARTITION, ROUND_ROBIN, [])
            final aggregation over (name_15)
                local exchange (GATHER, SINGLE, [])
                    remote exchange (REPARTITION, HASH, ["name_15"])
                        partial aggregation over (name_15)
                            join (INNER, PARTITIONED):
                                remote exchange (REPARTITION, HASH, ["nationkey", "suppkey"])
                                    join (INNER, PARTITIONED):
                                        remote exchange (REPARTITION, HASH, ["orderkey_3"])
                                            scan lineitem
                                        local exchange (GATHER, SINGLE, [])
                                            remote exchange (REPARTITION, HASH, ["orderkey"])
                                                join (INNER, PARTITIONED):
                                                    remote exchange (REPARTITION, HASH, ["custkey_0"])
                                                        scan orders
                                                    local exchange (GATHER, SINGLE, [])
                                                        remote exchange (REPARTITION, HASH, ["custkey"])
                                                            join (INNER, REPLICATED):
                                                                scan customer
                                                                local exchange (GATHER, SINGLE, [])
                                                                    remote exchange (REPLICATE, BROADCAST, [])
                                                                        join (INNER, REPLICATED):
                                                                            scan nation
                                                                            local exchange (GATHER, SINGLE, [])
                                                                                remote exchange (REPLICATE, BROADCAST, [])
                                                                                    scan region
                                local exchange (GATHER, SINGLE, [])
                                    remote exchange (REPARTITION, HASH, ["nationkey_9", "suppkey_6"])
                                        scan supplier
