final aggregation over ()
    local exchange (GATHER, SINGLE, [])
        remote exchange (GATHER, SINGLE, [])
            partial aggregation over ()
                join (INNER, REPLICATED):
                    scan lineitem
                    local exchange (GATHER, SINGLE, [])
                        remote exchange (REPLICATE, BROADCAST, [])
                            join (INNER, PARTITIONED):
                                final aggregation over (partkey_4)
                                    local exchange (GATHER, SINGLE, [])
                                        remote exchange (REPARTITION, HASH, ["partkey_4"])
                                            partial aggregation over (partkey_4)
                                                scan lineitem
                                local exchange (GATHER, SINGLE, [])
                                    remote exchange (REPARTITION, HASH, ["partkey_0"])
                                        scan part
