remote exchange (GATHER, SINGLE, [])
    local exchange (GATHER, UNKNOWN, [])
        remote exchange (REPARTITION, ROUND_ROBIN, [])
            join (INNER, REPLICATED):
                join (INNER, PARTITIONED):
                    remote exchange (REPARTITION, HASH, ["suppkey"])
                        scan supplier
                    final aggregation over (suppkey_0)
                        local exchange (GATHER, SINGLE, [])
                            remote exchange (REPARTITION, HASH, ["suppkey_0"])
                                partial aggregation over (suppkey_0)
                                    scan lineitem
                local exchange (GATHER, SINGLE, [])
                    remote exchange (REPLICATE, BROADCAST, [])
                        final aggregation over ()
                            local exchange (GATHER, SINGLE, [])
                                remote exchange (GATHER, SINGLE, [])
                                    partial aggregation over ()
                                        final aggregation over (suppkey_16)
                                            local exchange (GATHER, SINGLE, [])
                                                remote exchange (REPARTITION, HASH, ["suppkey_16"])
                                                    partial aggregation over (suppkey_16)
                                                        scan lineitem
