remote exchange (GATHER, SINGLE, [])
    local exchange (GATHER, UNKNOWN, [])
        remote exchange (REPARTITION, ROUND_ROBIN, [])
            semijoin (PARTITIONED):
                remote exchange (REPARTITION, HASH, [suppkey])
                    join (INNER, REPLICATED):
                        scan supplier
                        local exchange (GATHER, SINGLE, [])
                            remote exchange (REPLICATE, BROADCAST, [])
                                scan nation
                local exchange (GATHER, SINGLE, [])
                    remote exchange (REPARTITION, HASH, [suppkey_4])
                        join (INNER, PARTITIONED):
                            semijoin (PARTITIONED):
                                remote exchange (REPARTITION, HASH, [partkey])
                                    scan partsupp
                                local exchange (GATHER, SINGLE, [])
                                    remote exchange (REPARTITION, HASH, [partkey_8])
                                        scan part
                            local exchange (GATHER, SINGLE, [])
                                remote exchange (REPARTITION, HASH, [partkey_18])
                                    final aggregation over (partkey_18, suppkey_19)
                                        local exchange (GATHER, SINGLE, [])
                                            remote exchange (REPARTITION, HASH, [partkey_18, suppkey_19])
                                                partial aggregation over (partkey_18, suppkey_19)
                                                    scan lineitem
