remote exchange (GATHER, SINGLE, [])
    local exchange (GATHER, UNKNOWN, [])
        remote exchange (REPARTITION, ROUND_ROBIN, [])
            final aggregation over (expr_18, name_15)
                local exchange (GATHER, SINGLE, [])
                    remote exchange (REPARTITION, HASH, ["expr_18", "name_15"])
                        partial aggregation over (expr_18, name_15)
                            join (INNER, PARTITIONED):
                                remote exchange (REPARTITION, HASH, ["nationkey"])
                                    join (INNER, PARTITIONED):
                                        remote exchange (REPARTITION, HASH, ["orderkey"])
                                            join (INNER, PARTITIONED):
                                                join (INNER, PARTITIONED):
                                                    remote exchange (REPARTITION, HASH, ["suppkey_4"])
                                                        join (INNER, PARTITIONED):
                                                            remote exchange (REPARTITION, HASH, ["partkey"])
                                                                scan part
                                                            local exchange (GATHER, SINGLE, [])
                                                                remote exchange (REPARTITION, HASH, ["partkey_3"])
                                                                    scan lineitem
                                                    local exchange (GATHER, SINGLE, [])
                                                        remote exchange (REPARTITION, HASH, ["suppkey"])
                                                            scan supplier
                                                local exchange (GATHER, SINGLE, [])
                                                    remote exchange (REPARTITION, HASH, ["suppkey_8"])
                                                        scan partsupp
                                        local exchange (GATHER, SINGLE, [])
                                            remote exchange (REPARTITION, HASH, ["orderkey_11"])
                                                scan orders
                                local exchange (GATHER, SINGLE, [])
                                    remote exchange (REPARTITION, HASH, ["nationkey_14"])
                                        scan nation
