remote exchange (GATHER, SINGLE, [])
    local exchange (GATHER, UNKNOWN, [])
        remote exchange (REPARTITION, ROUND_ROBIN, [])
            final aggregation over (expr)
                local exchange (GATHER, SINGLE, [])
                    remote exchange (REPARTITION, HASH, ["expr"])
                        partial aggregation over (expr)
                            join (INNER, PARTITIONED):
                                remote exchange (REPARTITION, HASH, ["suppkey_4"])
                                    join (INNER, PARTITIONED):
                                        remote exchange (REPARTITION, HASH, ["orderkey_7"])
                                            join (INNER, REPLICATED):
                                                scan orders
                                                local exchange (GATHER, SINGLE, [])
                                                    remote exchange (REPLICATE, BROADCAST, [])
                                                        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, ["orderkey"])
                                                join (INNER, REPLICATED):
                                                    scan lineitem
                                                    local exchange (GATHER, SINGLE, [])
                                                        remote exchange (REPLICATE, BROADCAST, [])
                                                            scan part
                                local exchange (GATHER, SINGLE, [])
                                    remote exchange (REPARTITION, HASH, ["suppkey"])
                                        join (INNER, REPLICATED):
                                            scan supplier
                                            local exchange (GATHER, SINGLE, [])
                                                remote exchange (REPLICATE, BROADCAST, [])
                                                    scan nation
