local exchange (GATHER, SINGLE, [])
    remote exchange (GATHER, SINGLE, [])
        final aggregation over (orderdate, orderkey_3, shippriority)
            local exchange (GATHER, SINGLE, [])
                partial aggregation over (orderdate, orderkey_3, shippriority)
                    join (INNER, PARTITIONED):
                        remote exchange (REPARTITION, HASH, [orderkey_3])
                            scan lineitem
                        local exchange (GATHER, SINGLE, [])
                            remote exchange (REPARTITION, HASH, [orderkey])
                                join (INNER, PARTITIONED):
                                    remote exchange (REPARTITION, HASH, [custkey_0])
                                        scan orders
                                    local exchange (GATHER, SINGLE, [])
                                        remote exchange (REPARTITION, HASH, [custkey])
                                            scan customer
